FMN , and NADP NADP sup sup . Nucleotide derivatives such as the nucleoside triphosphate s play central ... Nucleotide structure File Ribose structure 2.png thumb Ribose structure indicating numbering of carbon atoms A nucleotide is composed of a nucleobase nitrogenous base , a five carbon sugar ... carbon site most common. Cyclic nucleotide s form when the phosphate group is bound to two of the sugar ... either a purine or a pyrimidine base. Nucleic acid s are polymeric macromolecules made from nucleotide ..., nucleotides can be synthesized de novo synthesis de novo or recycled through nucleotide salvage ... nucleotide pool in mouse tissues and tumors in vivo journal volume issue pages publisher location date url doi id accessdate ref The components used in de novo nucleotide synthesis are derived ... last Jones first ME authorlink coauthors title Pyrimidine nucleotide biosynthesis in animals Genes ... proceeds by a 10 step pathway to the branch point intermediate Inosine monophosphate IMP , the nucleotide ... reaction unique to purine nucleotide biosynthesis , PPAT catalyzes the displacement of PRPP s pyrophosphate ... forming 5 phosphorybosylamine 5 PRA and establishing the anomeric form of the future nucleotide ... NH sub 3 sub donor . Length unit Nucleotide abbreviated nt is a common length unit for single stranded ... http users.ox.ac.uk linc1775 blueprint.htm IUPAC nucleotide code ref Apart from the five A, G, C, T U ... . These nucleotide codes are listed here. class wikitable IUPAC nucleotide code Base Adenine A Adenine ... explanation of nucleotide structure Genetics state uncollapsed Nucleobases, nucleosides, and nucleotides ... Nukleotida is Kirni it Nucleotide he jv Nukleotida ka kk ht Nikleyotid la Nucleotidum lb Nukleotid lt Nukleotidas hu Nukleotid mk ms Nukleotida nl Nucleotide ... simple Nucleotide sk Nukleotid sl Nukleotid sr sh Nukleotidi fi Nukleotidi sv Nukleotid th tr N kleotit uk ur vi Nucleotide zh ... more details
enzyme Name nucleotide diphosphokinase EC number 2.7.6.4 CAS number 53167 92 3 IUBMB EC number 2 7 6 4 GO code 0050148 image width caption In enzymology , a nucleotide diphosphokinase EC number 2.7.6.4 is an enzyme that catalysis catalyzes the chemical reaction ATP nucleoside 5 phosphate math rightleftharpoons math AMP 5 phosphonucleoside 3 diphosphate Thus, the two substrate biochemistry substrates of this enzyme are adenosine triphosphate ATP and nucleoside 5 phosphate , whereas its two product chemistry products are adenosine monophosphate AMP and 5 phosphonucleoside 3 diphosphate . This enzyme belongs to the family of transferase s, specifically those transferring two phosphorus containing groups diphosphotransferase s . The systematic name of this enzyme class is ATP nucleoside 5 phosphate diphosphotransferase . Other names in common use include nucleotide pyrophosphokinase , ATP nucleotide pyrophosphotransferase , ATP nucleotide 3 pyrophosphokinase , and nucleotide 3 pyrophosphokinase . References reflist 1 cite journal author Murao S and Nishino T date 1974 title Isolation and identification of ATP nucleotide pyrophosphotransferase producing microorganism journal Agric. Biol. Chem. volume 38 pages 2483&ndash 2489 doi 10.1271 bbb1961.38.2483 issue 12 cite journal author Nishino T and Murao S date 1974 title Purification and some properties of ATP nucleotide pyrophosphotransferase of Streptomyces adephospholyticus journal Agric. Biol. Chem. volume 38 pages 2491&ndash 2496 doi 10.1271 bbb1961.38.2491 issue 12 cite journal author Nishino T and Murao S date 1975 title Characterization of pyrophosphoryl transfer reaction of ATP nucleotide pyrophosphotransferase journal Agric. Biol. Chem. volume 39 pages 1007&ndash 1014 doi 10.1271 bbb1961.39.1007 issue 5 enzyme stub Category EC 2.7.6 Category Enzymes of unknown structure ... more details
Image Cyclic adenosine monophosphate 2D skeletal.png thumb Cyclic adenosine monophosphate Image CGMP.png thumb Cyclic guanosine monophosphate A cyclic nucleotide is any nucleotide in which the phosphate group is bonded to two of the sugar s hydroxyl groups, forming a cyclical or ring structure. These include cyclic AMP cyclic GMP cyclic ADP ribose These function as second messenger s associated with G protein s and calcium signaling . External links MeshName Nucleotides, Cyclic Nucleobases, nucleosides, and nucleotides Category Nucleotides Biochem stub bg et Ts klilised nukleotiidid nl Cyclisch nucleotide no Syklisk nukleotid sr Cikli ni nukleotid ... more details
Nucleotide diversity is a concept in molecular genetics which is used to measure the degree of polymorphism biology polymorphism within a population. ref cite journal title Mathematical Model for Studying Genetic Variation in Terms of Restriction Endonucleases journal PNAS date October 1, 1979 first last coauthors Masatoshi Nei and Wen Hsiung Li volume 76 issue 10 pages 5269 73 pmid 291943 pmc 413122 url doi 10.1073 pnas.76.10.5269 author Nei, M. ref One commonly used measure of nucleotide diversity was first introduced by Nei and Li in 1979. This measure is defined as the average number of nucleotide differences per site between any two DNA sequences chosen randomly from the sample population, and is denoted by . It is given by the formula math pi sum ij x i x j pi ij 2 sum i 1 n sum j 1 i 1 x i x j pi ij math where x sub i sub and x sub j sub are the respective frequencies of the i th and j th sequences, sub ij sub is the number of nucleotide differences per nucleotide site between the i th and j th sequences, and n is the number of sequences in the sample. Nucleotide diversity is a measure of genetic variation . It is usually associated with other statistical measures of population ... reveal no reduction of nucleotide diversity during Triticum monococcum Einkorn domestication implications ... relationships. ref cite journal title Nucleotide diversity in gorillas journal Genetics ... cgi pmidlookup?view long&pmid 15082556 author Yu, N. ref Nucleotide diversity can be calculated ... Amplified Polymorphic DNA RAPD data ref cite journal title Estimating nucleotide diversity from ... Length Polymorphism AFLP data. ref cite journal title A method for estimating nucleotide diversity ... DnaSP &mdash DNA Sequence Polymorphism, is a software package for the analysis of nucleotide polymorphism ... of nucleotide diversity and a variety of other statistical tests for intra population and inter ... Reflist DEFAULTSORT Nucleotide Diversity Category Molecular genetics genetics stub ar ... more details
Nucleotide sugars are the activated forms of monosaccharides . Nucleotide sugars act as glycosyl donors in glycosylation reactions. Those reactions are catalyzed by a group of enzymes called glycosyltransferase s. History The anabolism of oligosaccharides and, hence, the role of nucleotide sugars was not clear until 1950s when Leloir and his coworkers found that the key enzymes in this process are the glycosyltranserases. These enzymes transfer a glycosyl group from a sugar nucleotide to an acceptor. ref cite journal author Derek Horton title The Development of Carbohydrate Chemistry and Biology journal Carbohydrate Chemistry, Biology and Medical Applications pages 1 28 year 2008 doi 10.1016 B978 0 08 054816 6.00001 X isbn 9780080548166 ref Biological Importance To act as glycosyl donors, those monosaccharides should exist in a highly energetic form. This occurs as a result of a reaction between nucleoside triphosphate NTP and glycosyl monophosphate phosphate at anomeric carbon . Image activatedmonosaccahride.png frameless center 600px Activation of Monosaccharides Types There are nine sugar nucleotides in complex animals which act as glycosyl donors and they can be classified depending on the type of the nucleoside forming them ref http www.cshlpress.com default.tpl?action full& eqskudatarq ... Diphosphate GDP mannose GDP Man , GDP Fuc. Cytosine Monophosphate CMP Neu5Ac , it is the only nucleotide sugar in the form of nucleotide monophosphate. In plants and bacteria many other sugars are used ... in nucleotide sugar precursor synthesis and O antigen assembly journal Carbohydr. Res. volume 338 ... of some nucleotide sugars example from each type . class wikitable border 1 style text align center ... GDP Man Relationship between glycosylation pathways and different diseases Normal metabolism of nucleotide ... feeding problems. See also Nucleotide sugars metabolism Carbohydrate chemistry Glycosyltransferase References reflist External links MeshName Nucleotide sugars Nucleotide sugars Category Metabolism Category ... more details
enzyme Name nucleotide diphosphatase EC number 3.6.1.9 CAS number 9032 64 8 IUBMB EC number 3 6 1 9 GO code 0004551 image width caption In enzymology , a nucleotide diphosphatase EC number 3.6.1.9 is an enzyme that catalysis catalyzes the chemical reaction a dinucleotide H sub 2 sub O math rightleftharpoons math 2 mononucleotides Thus, the two substrate biochemistry substrates of this enzyme are dinucleotide and water H sub 2 sub O , whereas its product chemistry product is Nucleotide mononucleotide . This enzyme belongs to the family of hydrolase s, specifically those acting on acid anhydrides in phosphorus containing anhydrides. The systematic name of this enzyme class is dinucleotide nucleotidohydrolase . Other names in common use include nucleotide pyrophosphatase , and nucleotide sugar pyrophosphatase . This enzyme participates in 5 metabolism metabolic pathways purine metabolism , starch and sucrose metabolism , riboflavin metabolism , nicotinate and nicotinamide metabolism , and pantothenate and coa biosynthesis . Structural studies As of 2007 alt As of late 2007 , 5 tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB link 1NQY , PDB link 1NQZ , PDB link 2GSN , PDB link 2GSO , and PDB link 2GSU . References reflist 1 cite journal author Jacobson JB and Kaplan NO date 1957 title A reduced pyridine nucleotide pyrophosphatase journal J. Biol. Chem. volume 226 pages 427&ndash 437 pmid 13428775 cite journal author Kornberg A and Pricer WE date 1950 title Nucleotide pyrophosphatase journal J. Biol. Chem. volume 182 pages 763&ndash 778 cite journal author Kumar SA, Rao NA, Vaidyanathan CS date 1965 title Nucleotidases in plants. I. Partial purification and properties of the enzyme hydrolyzing flavine adenine dinucleotide from mung bean seedlings Phaseolus radiatus journal Arch. Biochem. Biophys. volume ... MN, Kaplan NO and Lamborg MF date 1958 title A heat activated diphosphopyridine nucleotide pyrophosphatase ... more details
A salvage pathway is a Metabolic pathway pathway in which nucleotide s purine and pyrimidine are synthesized from intermediates in the degradative pathway for nucleotides. Salvage pathways are used to recover bases and nucleosides that are formed during biodegradation degradation of RNA and DNA . This is important in some organs because some tissues cannot undergo de novo synthesis . The salvaged bases and nucleosides can then be converted back into nucleotides. Substrates The salvage pathway requires distinct substrates Pyrimidines Uridine phosphorylase adds ribose 1 phosphate to the free base uracil, forming uridine monophosphate. Uridine kinase then phosphorylates this nucleoside into its diphosphate and triphosphate forms. Deoxythymidine phosphorylase adds deoxyribose 1 phosphate to thymine, forming deoxythymidine monophosphate. Thymidine kinase can then phosphorylate this compound to deoxythymidine diphosphate and triphosphate. Image Pyrimidine Ribonucleotide Salvage.png thumb none 400px The salvage of pyrimidine ribonucleotides. Purines Phosphoribosyltransferases add activated ribose 5 phosphate called phosphoribosyl pyrophosphate or PRPP to bases, creating nucleotide monophosphates. There are two types of phosphoribosyltransferases adenine phosphoribosyltransferase APRT and hypoxanthine guanine phosphoribosyltransferase HGPRT . Lesch Nyhan syndrome is associated with a deficiency of HGPRT. class wikitable Nucleoside Enzyme Nucleotide hypoxanthine hypoxanthine guanine phosphoribosyl transferase HGPRT Inosine monophosphate IMP guanine hypoxanthine guanine phosphoribosyl transferase HGPRT Guanosine monophosphate GMP adenine adenine phosphoribosyltransferase APRT Adenosine monophosphate AMP External links http www.chem.brandeis.edu pochapsky research.html Enzymes in the methionine salvage pathway structure and function at Brandeis University Category Genetics genetics stub Protein metabolism Nucleotide metabolism ca Salvament de nucle tids de Salvage Pathway ja ... more details
Unreferenced date November 2006 Image Aminoallyl Uridine.svg right frame The structure of aminoallyluridine Aminoallyl nucleotides are used in post labeling of nucleic acid s to be used in microarray s. These nucleotides are formally known as 5 3 amino allyl nucleotides since the aminoallyl group is usually attached to carbon 5 of the pyrimidine ring of uracil and cytosine . They are usually abbreviated as aa , such as aa dUTP. The amine group in the aminoallyl moiety is aliphatic and thus more reactive compared to the amine groups that are directly attached to the rings aromatic of the bases. Uses The aminoallyl group in aminoallyl modified nucleotides is reactive with dyes such as the cyanine series, AnaSpec HiLyte Fluor , or Alexa Fluor dyes that also been modified to be amine reactive. A problem with this method is that the dyes react with the buffering agent usually used for storage of nucleotides. Instead a carbonate buffer is used. The DNA or RNA from a sample is copied in vitro by T7 polymerase, RT polymerase or some other polymerase except of eukaryotic origin in a mix of nucleotides in which one, typically uracil RNA and also DNA , is a mix aminoallyl NTP and normal UTP. An alternative method is using thiol reactive dyes. DEFAULTSORT Aminoallyl Nucleotide Category Nucleic acids Category Nucleotides molecular cell biology stub ... more details
Image Uridine diphosphate galactose.svg thumb right 250px The nucleotide sugar Uridine diphosphate galactose UDP galactose . In nucleotide sugar metabolism a group of biochemical s known as nucleotide sugars act as donors for sugar residues in the glycosylation reactions that produce polysaccharide s. ref name Ginsburg cite journal author Ginsburg V title Comparative biochemistry of nucleotide linked sugars journal Prog. Clin. Biol. Res. volume 23 issue pages 595 600 year 1978 pmid 351635 ref They are substrates for glycosyltransferase s. ref cite journal author Rademacher T, Parekh R, Dwek R title Glycobiology journal Annu Rev Biochem volume 57 issue pages 785 838 year 1988 pmid 3052290 doi 10.1146 annurev.bi.57.070188.004033 ref The nucleotide sugars are also intermediates in nucleotide sugar interconversions that produce some of the activated sugars needed for glycosylation reactions. ref name Ginsburg Since most glycosylation takes place in the endoplasmic reticulum and golgi apparatus , there are a large family of nucleotide sugar transporter s that allow nucleotide sugars to move from the cytoplasm , where they are produced, into the organelles where they are consumed. ref cite journal author Handford M, Rodriguez Furl n C, Orellana A title Nucleotide sugar transporters structure, function and roles in vivo journal Braz. J. Med. Biol. Res. volume 39 issue 9 pages 1149 58 year 2006 pmid 16981043 url http www.scielo.br scielo.php?script sci arttext&pid S0100 879X2006000900002&lng en&nrm iso&tlng en ref ref cite journal author Gerardy Schahn R, Oelmann S, Bakker H title Nucleotide ... 775 82 year 2001 pmid 11530210 doi 10.1016 S0300 9084 01 01322 0 ref Nucleotide sugar metabolism ... involved in nucleotide sugar precursor synthesis and O antigen assembly journal Carbohydr. Res ... involved are less well understood. ref cite journal author Seifert GJ title Nucleotide sugar interconversions ... References reflist Nucleotide sugars Category Metabolism biochem stub ... more details
Unreferenced date December 2009 Nucleotide exchange factor s NEF s are protein s that stimulate the exchange replacement of nucleoside diphosphate s for nucleoside triphosphate s bound to other proteins. Function Many cellular proteins cleave hydrolysis hydrolyze nucleoside triphosphates&ndash adenosine triphosphate ATP or guanosine triphosphate GTP &ndash to their diphosphate forms adenosine diphosphate ADP and guanosine diphosphate GDP as a source of energy and to drive conformational changes. These changes in turn affect the structural, enzyme enzymatic , or signalling properties of the protein. Nucleotide exchange factors actively assist in the exchange of depleted nucleoside diphosphates for fresh nucleoside triphosphates. NEFs are specific for the nucleotides they exchange ADP or GDP, but not both and are often specific to a single protein or class of proteins with which they interact. See also Nucleoside diphosphate kinase Guanine nucleotide exchange factor DEFAULTSORT Nucleotide Exchange Factor Category Proteins Protein stub ... more details
enzyme Name pyrimidine 5 nucleotide nucleosidase EC number 3.2.2.10 CAS number 9023 31 8 IUBMB EC number 3 2 2 10 GO code 0047405 image width caption In enzymology , a pyrimidine 5 nucleotide nucleosidase EC number 3.2.2.10 is an enzyme that catalysis catalyzes the chemical reaction a pyrimidine 5 nucleotide H sub 2 sub O math rightleftharpoons math D ribose 5 phosphate a pyrimidine base Thus, the two substrate biochemistry substrates of this enzyme are pyrimidine 5 nucleotide and water H sub 2 sub O , whereas its two product chemistry products are D ribose 5 phosphate and pyrimidine base . This enzyme belongs to the family of hydrolase s, specifically those glycosylases that hydrolyse N glycosyl compounds. The systematic name of this enzyme class is pyrimidine 5 nucleotide phosphoribo deoxyribo hydrolase . Other names in common use include pyrimidine nucleotide N ribosidase , and Pyr5N . This enzyme participates in pyrimidine metabolism . References reflist 1 cite journal author Imada A date 1967 title Degradation of pyrimidine nucleotides by enzyme systems of Streptomyces. II. Pyrimidine 5 nucleotide phosphoribo deoxyribo hydrolase of Streptomyces virginiae journal J. Gen. Appl. Microbiol. volume 13 pages 267&ndash 278 doi 10.2323 jgam.13.267 issue 3 cite journal author Imada A, Kuno M and Igarasi S date 1967 title Degradation of pyrimidine nucleotides by enzyme systems of Streptomyces. I. Ribose 5 phosphate formation from pyrimidine nucleotides journal J. Gen. Appl. Microbiol. volume 13 pages 255&ndash 265 hydrolase stub Category EC 3.2.2 Category Enzymes of unknown structure ... more details
Pfam box Symbol GDI Name GDP dissociation inhibitor image width caption Pfam PF00996 InterPro IPR002005 SMART Prosite SCOP 1gnd TCDB OPM family OPM protein PDB PDB3 1ukv G 1 449 PDB3 2bcg G 1 449 PDB3 1lv0 A 1 438 PDB3 1gnd 1 430 PDB3 1d5t A 1 431 PDB3 1vg9 E 5 542 PDB3 1vg0 A 5 542 PDB3 1ltx R 5 542 The Guanosine nucleotide dissociation inhibitors GDIs , bind to the GDP bound form of Rho and Rab small GTPase s and not only prevent exchange maintaining the small GTPase in an off state , but also prevent the small GTPase from localizing at the membrane, which is their place of action. This inhibition can be removed by the action of a Guanine nucleotide exchange factor GEF . It also inhibits cdc42 by binding to its tail and preventing cdc42 insert itself into membrane, hence it cannot trigger Wiskott Aldrich syndrome protein WASPs and cannot lead to nucleates of F actin External links MeshName Guanine Nucleotide Dissociation Inhibitors Category GTP binding protein regulators GTP binding protein regulators biochem stub DEFAULTSORT Guanosine Nucleotide Dissociation Inhibitors sr Inhibitori disocijacije guanozin nukleotida ... more details
enzyme Name nicotinamide nucleotide adenylyltransferase EC number 2.7.7.1 CAS number 9032 70 6 IUBMB EC number 2 7 7 1 GO code 0000309 image width caption In enzymology , a nicotinamide nucleotide adenylyltransferase EC number 2.7.7.1 is an enzyme that catalysis catalyzes the chemical reaction ATP nicotinamide ribonucleotide math rightleftharpoons math diphosphate NAD sup sup Thus, the two substrate biochemistry substrates of this enzyme are adenosine triphosphate ATP and nicotinamide ribonucleotide , whereas its two product chemistry products are diphosphate and nicotinamide adenine dinucleotide NAD sup sup . This enzyme belongs to the family of transferase s, specifically those transferring phosphorus containing nucleotide groups nucleotidyltransferase s . The systematic name of this enzyme class is ATP nicotinamide nucleotide adenylyltransferase . Other names in common use include NAD pyrophosphorylase , adenosine triphosphate nicotinamide mononucleotide transadenylase , ATP NMN adenylyltransferase , diphosphopyridine nucleotide pyrophosphorylase , nicotinamide adenine dinucleotide pyrophosphorylase , nicotinamide mononucleotide adenylyltransferase , and NMN adenylyltransferase . This enzyme participates in nicotinate and nicotinamide metabolism . The human version of this protein is NMNAT1 . Structural studies As of late 2007, 11 tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB link 1EJ2 , PDB link 1GZU , PDB link 1HYB , PDB link 1KKU , PDB link 1KQN , PDB link 1KQO , PDB link 1KR2 , PDB link 1M8F , PDB link 1M8G , PDB link 1M8J , and PDB link 1M8K . References reflist 1 cite journal author ATKINSON ... Dahmen W, Webb B, Preiss J date 1967 title The deamido diphosphopyridine nucleotide and diphosphopyridine nucleotide pyrophosphorylases of Escherichia coli and yeast journal Arch. Biochem. Biophys ... author Kornberg A and Pricer WE date 1951 title Enzymatic cleavage of diphosphopyridine nucleotide ... more details
enzyme Name nicotinate nucleotide adenylyltransferase EC number 2.7.7.18 CAS number 9026 98 6 IUBMB EC number 2 7 7 18 GO code 0004515 image width caption In enzymology , a nicotinate nucleotide adenylyltransferase EC number 2.7.7.18 is an enzyme that catalysis catalyzes the chemical reaction ATP nicotinate ribonucleotide math rightleftharpoons math diphosphate deamido NAD sup sup Thus, the two substrate biochemistry substrates of this enzyme are adenosine triphosphate ATP and nicotinate ribonucleotide , whereas its two product chemistry products are diphosphate and deamido NAD . This enzyme belongs to the family of transferase s, specifically those transferring phosphorus containing nucleotide groups nucleotidyltransferase s . The systematic name of this enzyme class is ATP nicotinate ribonucleotide adenylyltransferase . Other names in common use include deamido NAD pyrophosphorylase , nicotinate mononucleotide adenylyltransferase , deamidonicotinamide adenine dinucleotide pyrophosphorylase , NaMN ATase , and nicotinic acid mononucleotide adenylyltransferase . This enzyme participates in nicotinate and nicotinamide metabolism . Structural studies As of late 2007, 9 tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB link 1K4K , PDB link 1K4M , PDB link 1KAM , PDB link 1KAQ , PDB link 1YUL , PDB link 1YUM , PDB link 1YUN , PDB link 2H29 , and PDB link 2H2A . References reflist 1 cite journal author IMSANDE J date 1961 title Pathway of diphosphopyridine nucleotide biosynthesis in Escherichia coli journal J. Biol. Chem. volume 236 pages 1494&ndash 7 pmid 13717628 enzyme stub Category EC 2.7.7 Category Enzymes of known structure ... more details
protein Name solute carrier family 25 mitochondrial carrier adenine nucleotide translocator , member 4 caption image width HGNCid 10990 Symbol SLC25A4 AltSymbols PEO3, PEO2, ANT1 EntrezGene 291 OMIM 103220 RefSeq NM 001151 UniProt P12235 PDB ECnumber Chromosome 4 Arm q Band 35 LocusSupplementaryData protein Name solute carrier family 25 mitochondrial carrier adenine nucleotide translocator , member 5 caption image width HGNCid 10991 Symbol SLC25A5 AltSymbols ANT2 EntrezGene 292 OMIM 300150 RefSeq NM 001152 UniProt P05141 PDB ECnumber Chromosome X Arm q Band 24 LocusSupplementaryData q26 protein Name solute carrier family 25 mitochondrial carrier adenine nucleotide translocator , member 6 caption image width HGNCid 10992 Symbol SLC25A6 AltSymbols ANT3 EntrezGene 293 OMIM 403000 RefSeq NM 001636 UniProt P12236 PDB ECnumber Chromosome Y Arm p Band LocusSupplementaryData Adenine nucleotide translocator ANT also known as the adenosine diphosphate ADP Adenosine triphosphate ATP translocator is a mitochondrial protein. Function ANT has long been thought to function asymmetrically as a homodimer of subunits in the inner mitochondrial membrane. The dimer was thought to be a gated pore through which ADP and ATP were exchanged between the mitochondrial matrix and the cytoplasm. The dimer hypothesis was first challenged when the three dimensional structure of ANT was discovered to be a monomer. ref name pmid14603310 cite journal author Pebay Peyroula E, Dahout Gonzalez C, Kahn R, Tr z guet V, Lauquin GJ, Brandolin G title Structure of mitochondrial ADP ATP carrier in complex with carboxyatractyloside journal Nature volume 426 issue 6962 pages 39 44 year 2003 month November pmid 14603310 doi 10.1038 nature02056 url issn ref Further work has shown that ANT functions a monomer in detergents ref name pmid17572439 cite journal author Bamber L, Slotboom DJ, Kunji ER title Yeast mitochondrial ... Nucleotide Translocator 1 MeshName Adenine Nucleotide Translocator 2 MeshName Adenine Nucleotide Translocator ... more details
File Nucleotide Excision Repair journal.pbio.0040203.g001.png thumb Diagram ref cite doi 10.1371 journal.pbio.0040203 ref Nucleotide excision repair is a DNA repair mechanism. ref name GriffithsWessler2008 cite book author1 Anthony J. F. Griffiths author2 Susan R. Wessler author3 Richard C. Lewontin title Introduction to genetic analysis url http books.google.com books?id MsFkrBY2 5AC&pg PA534 accessdate 4 December 2010 year 2008 publisher Macmillan isbn 9780716768876 pages 534 ref DNA constantly requires repair due to damage that can occur to bases from a vast variety of sources including chemicals, radiation and other mutagens. Nucleotide excision repair NER is a particularly important mechanism by which the cell can prevent unwanted mutations by removing the vast majority of UV induced DNA damage mostly in the form of thymine dimer s and 6 4 photoproducts . The importance of this repair mechanism is evidenced by the severe human diseases that result from in born genetic mutations of NER proteins including Xeroderma pigmentosum and Cockayne syndrome Cockayne s syndrome . While the base excision repair machinery can recognize specific lesions in the DNA it can correct only damaged bases that can be removed by a specific glycosylase, the nucleotide excision repair enzymes recognize ... of nucleotide excision repair is controlled in Escherichia coli E. coli by the UvrABC endonuclease enzyme ... damage and created 12 nucleotide excised segment. DNA helicase II sometimes called UvrD then comes ... is a simple example. Nucleotide Excision Repair in Eukaryotes Nucleotide excision repair has more ... also participate in nucleotide excision repair. As described below, nucleotide excision ... conclusion is that the binding of transcription factors led to an increase in nucleotide excision ... Enzyme cuts at the Nucleotide excision repair. L Bridgewater, experiment TAB See also Base excision ... przez wycinanie nukleotydu sv Nucleotide excision repair zh ... more details
enzyme Name nicotinate nucleotide diphosphorylase carboxylating EC number 2.4.2.19 CAS number 37277 74 0 IUBMB EC number 2 4 2 19 GO code 0004514 image width caption In enzymology , a nicotinate nucleotide diphosphorylase carboxylating EC number 2.4.2.19 is an enzyme that catalysis catalyzes the chemical reaction nicotinate D ribonucleotide diphosphate CO sub 2 sub math rightleftharpoons math pyridine 2,3 dicarboxylate 5 phospho alpha D ribose 1 diphosphate The 3 substrate biochemistry substrates of this enzyme are nicotinate D ribonucleotide , diphosphate , and carbon dioxide CO sub 2 sub , whereas its two product chemistry products are pyridine 2,3 dicarboxylate and 5 phospho alpha D ribose 1 diphosphate . This enzyme belongs to the family of glycosyltransferase s, specifically the pentosyltransferases. The systematic name of this enzyme class is nicotinate nucleotide diphosphate phospho alpha D ribosyltransferase carboxylating . Other names in common use include quinolinate phosphoribosyltransferase decarboxylating , quinolinic acid phosphoribosyltransferase , QAPRTase , NAD pyrophosphorylase , nicotinate mononucleotide pyrophosphorylase carboxylating , and quinolinic phosphoribosyltransferase . This enzyme participates in nicotinate and nicotinamide metabolism . Structural studies As of late 2007, 9 tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB link 1QAP , PDB link 1QPN , PDB link 1QPO , PDB link 1QPQ , PDB link 1QPR , PDB link 1X1O , PDB link 2B7N , PDB link 2B7P , and PDB link 2B7Q . References reflist 1 cite journal author GHOLSON RK, UEDA I, OGASAWARA N, HENDERSON LM date 1964 title THE ENZYMATIC CONVERSION OF QUINOLINATE TO NICOTINIC ACID MONONUCLEOTIDE IN MAMMALIAN LIVER journal J. Biol. Chem. volume 239 pages 1208&ndash 14 pmid 14165928 cite journal author Packman PM, Jakoby WB date 1965 title Crystalline quinolinate phosphoribosyltransferase journal J. Biol. Chem. volume 240 pages ... more details
enzyme Name nicotinamide nucleotide amidase EC number 3.5.1.42 CAS number 37355 58 1 IUBMB EC number 3 5 1 42 GO code 0019159 image width caption In enzymology , a nicotinamide nucleotide amidase EC number 3.5.1.42 is an enzyme that catalysis catalyzes the chemical reaction beta nicotinamide D ribonucleotide H sub 2 sub O math rightleftharpoons math beta nicotinate D ribonucleotide NH sub 3 sub Thus, the two substrate biochemistry substrates of this enzyme are beta nicotinamide D ribonucleotide and water H sub 2 sub O , whereas its two product chemistry products are beta nicotinate D ribonucleotide and ammonia NH sub 3 sub . This enzyme belongs to the family of hydrolase s, those acting on carbon nitrogen bonds other than peptide bonds, specifically in linear amides. The systematic name of this enzyme class is nicotinamide D ribonucleotide amidohydrolase . Other names in common use include NMN deamidase , nicotinamide mononucleotide deamidase , and nicotinamide mononucleotide amidohydrolase . This enzyme participates in nicotinate and nicotinamide metabolism . References reflist 1 cite journal author Imai T date Tokyo title Purification and properties of nicotinamide mononucleotide amidohydrolase from Azotobacter vinelandii journal J. volume Biochem. pages 139&ndash 53 pmid 4144084 issue 1 hydrolase stub Category EC 3.5.1 Category Enzymes of unknown structure ... more details
The Purine Nucleotide Cycle is a metabolic pathway in which fumarate is generated from aspartate in order to increase the concentration of Krebs cycle intermediates. ref Salway, J. G., Metabolism at a glance 3rd edition , Blackwell Publishing Ltd., Oxford, 2004, pp. 56 57 ref The pathway was first described by John Lowenstein, who demonstrated its role in increasing the rate of oxidative phosphorylation in skeletal muscle . ref Voet, D., Voet, J. G., Biochemistry 3rd Edition , John Wiley & Sons, Inc., 2004, pp. 1094 1095 ref Outline The cycle is composed of three Enzyme enzyme catalysed reactions. The first stage is the deamination of the purine nucleotide Adenosine monophosphate AMP to form inosine monophosphate IMP , catalysed by the enzyme AMP deaminase AMP H sub 2 sub O IMP NH sub 4 sub sup sup The second stage is the formation of adenylosuccinate from IMP and the amino acid aspartate , which is coupled to the energetically favourable hydrolysis of Guanosine triphosphate GTP , and catalysed by the enzyme adenylosuccinate synthetase Aspartate IMP GTP Adenylosuccinate Guanosine diphosphate GDP Inorganic phosphate P sub i sub Finally, Adenylosuccinate is cleaved by the enzyme adenylosuccinate lyase to release fumarate and regenerate the starting material of AMP Adenylosuccinate AMP Fumarate References ISBN Reflist Category Purines Category Metabolic pathways Category Biochemistry fr Cycle des nucl otides puriques zh ... more details
Pfam box Symbol cNMP binding Name Cyclic nucleotide binding domain image PDB 1cgp EBI.jpg width caption Structure of a CAP DNA complex. ref name pmid1653449 cite journal author Schultz SC, Shields GC, Steitz TA title Crystal structure of a CAP DNA complex the DNA is bent by 90 degrees journal Science volume 253 issue 5023 pages 1001 7 year 1991 month August pmid 1653449 doi 10.1126 science.1653449 url bibcode 1991Sci...253.1001S ref Pfam PF00027 InterPro IPR000595 SMART SM00100 PROSITE PDOC00691 SCOP 1cgp TCDB OPM family OPM protein PDB PDB3 1o7f A 375 462 PDB3 2apk 153 242 PDB3 1kmw R 154 243 PDB3 1kmu R 154 243 PDB3 1cx4 A 170 259 PDB3 1rl3 A 153 238 PDB3 1ne6 A 153 238 PDB3 1ne4 A 153 238 PDB3 1rgs 153 238 PDB3 1apk 153 238 PDB3 1pvk A 153 238 PDB3 1u7e B 153 238 PDB3 2bpk 275 372 PDB3 1bpk 271 362 PDB3 1q43 A 535 620 PDB3 1q5o A 535 620 PDB3 1q3e A 535 620 PDB3 1vp6 C 253 336 PDB3 1u12 B 253 336 PDB3 1i6x A 21 112 PDB3 1hw5 A 21 112 PDB3 1j59 B 21 112 PDB3 1o3s A 21 112 PDB3 1g6n B 21 112 PDB3 1lb2 A 21 112 PDB3 1cgp B 21 112 PDB3 1ruo B 21 112 PDB3 2cgp A 21 112 PDB3 1o3r A 21 112 PDB3 1i5z B 21 112 PDB3 1o3t A 21 112 PDB3 1run A 21 112 PDB3 1o3q A 21 112 PDB3 1ft9 A 25 107 PDB3 1o5l A 12 103 PDB3 1wgp A 532 632 Proteins that bind cyclic nucleotides Cyclic adenosine monophosphate cAMP or cyclic guanosine monophosphate cGMP share a structural domain of about 120 residues. The best studied of these proteins is the prokaryotic catabolite gene activator also known as the cAMP receptor protein gene crp where such a domain is known to be composed of three alpha helices and a distinctive eight stranded, antiparallel beta barrel structure. There are six invariant amino acids ... contain two tandem copies of the cyclic nucleotide binding domain. The cAPK s are composed of two ... section. Vertebrate cyclic nucleotide gated ion channels also contain this domain. Two such cations ... reading Cyclic nucleotide gated channels an expanding new family of ion channels. Yau KW Proc Natl ... more details
enzyme Name nicotinate nucleotide dimethylbenzimidazole phosphoribosyltransferase EC number 2.4.2.21 CAS number 37277 76 2 IUBMB EC number 2 4 2 21 GO code 0008939 image width caption Infobox protein family Symbol DBI PRT Name Phosphoribosyltransferase image PDB 1j33 EBI.jpg width caption crystal structure of cobt from thermus thermophilus hb8 Pfam PF02277 Pfam clan InterPro IPR003200 SMART PROSITE MEROPS SCOP 1d0s TCDB OPM family OPM protein CAZy CDD cd02439 In enzymology , a nicotinate nucleotide dimethylbenzimidazole phosphoribosyltransferase EC number 2.4.2.21 is an enzyme that catalysis catalyzes the chemical reaction beta nicotinate D ribonucleotide 5,6 dimethylbenzimidazole math rightleftharpoons math nicotinate alpha ribazole 5 phosphate Thus, the two substrate biochemistry substrates of this enzyme are beta nicotinate D ribonucleotide and 5,6 dimethylbenzimidazole , whereas its two product chemistry products are nicotinate and alpha ribazole 5 phosphate . This enzyme belongs to the family of glycosyltransferase s, specifically the pentosyltransferases. The systematic name of this enzyme class is nicotinate nucleotide 5,6 dimethylbenzimidazole phospho D ribosyltransferase . Other names in common use include CobT , nicotinate mononucleotide dimethylbenzimidazole phosphoribosyltransferase , nicotinate ribonucleotide benzimidazole adenine phosphoribosyltransferase , nicotinate nucleotide dimethylbenzimidazole phospho D ribosyltransferase , and nicotinate mononucleotide NaMN ... dimethylbenzimidazole, an intermediate in the synthesis of the nucleotide loop of cobalamin journal ... and the assembly of the nucleotide loop. ref name pmid12101181 cite journal author Cheong CG, Escalante ... glycosidic nucleotide precursor journal J. Biol. Chem. volume 244 pages 1659&ndash 66 pmid 4238408 ..., nucleotide sequence, and products of two Pseudomonas denitrificans cob genes encoding nicotinate nucleotide dimethylbenzimidazole phosphoribosyltransferase and cobalamin 5 phosphate synthase ... more details
enzyme Name Nucleotide pyrophosphatase phosphodiesterase NPP EC number 3.6.1.9 image Nucleotide pyrophosphatase.png width caption The overall dimeric structure of NPP in Xanthomonas axonopodis pv. citri str. 306 . This enzyme relies on the catalytic ability of 2 Zn sup 2 sup atoms in the catalytic core, which are shown in white. ref name Structural and Functional Comparisons Nucleotide pyrophosphatase phosphodiesterase NPP is a class of dimeric enzymes that catalyze the hydrolysis of phosphate diester bonds. NPP belongs to the alkaline phosphatase AP superfamily of enzymes. ref http cmgm.stanford.edu biochem herschlag research protein catalysis.html Enzyme Promiscuity, Evolution, and Phosphoryl Transfer. Herschlag Lab. Stanford University, accessdate 1 March 2012. ref The NPP family of enzymes includes seven isoforms , some of which prefer nucleotide enzyme substrate biology substrates , some of which prefer phospholipid substrates, and others of which prefer substrates that have not yet been determined. ref Pham, Truc Chi T. Wanjala, Irene Howard, Angela Parrill, Abby L. Baker, Daniel L. Insights into the structure and function of lipid preferring Nucleotide PyrophosphotasePhosphodiesterase isoforms 2011 ref In eukaryotes, NPP enzymes are located in the cell membrane and hydrolyze extracellular phosphate diesters to affect a wide variety of biological processes. ref cite journal doi 10.1016 j.tibs.2005.08.005 title NPP type ectophosphodiesterases Unity in diversity year 2005 last1 Stefan first1 Cristiana last2 Jansen first2 Silvia last3 Bollen first3 Mathieu journal Trends ... S0925 4439 03 00058 9 title Physiological and pathophysiological functions of the ecto nucleotide ... pmc 3249517 ref File Nucleotide pyrophosphatase close up.png thumb 265px A closer view of the active ... and functional comparisons of nucleotide pyrophosphatase phosphodiesterase and alkaline phosphatase ... Study of Phosphodiester Hydrolysis in Nucleotide Pyrophosphatase Phosphodiesterase. Environmental ... more details
of SNPs in the human genome Microsatellites as predictors of nucleotide diversity and divergence ... allele frequencies for single nucleotide polymorphisms. There are variations between human populations ... region Synonymous Nonsynonymous Missense Nonsense Single nucleotide polymorphism biology polymorphisms ... nucleotide polymorphisms journal Nature volume 409 issue 6822 pages 928 33 year 2001 pmid 11237013 ... and greater than sign showing the wild type and altered nucleotide or amino acid for example, c.76A ... first2 S.N. title Identification of base pairs in single nucleotide polymorphisms by MutS protein ... analysis of single nucleotide polymorphisms ternary encoding of genotypes. journal Analytical chemistry ... base nucleotide substitutions and short deletion and insertion polymorphisms http www.hgmd.cf.ac.uk ... Nucleotide Polymorphism Category Molecular biology Category Population genetics Category DNA Category ... de Single Nucleotide Polymorphism et ksiku nukleotiidi pol morfism es Polimorfismo ... a singolo nucleotide hu Egypontos nukleotid polimorfizmus nl Enkel nucleotide polymorfisme ... more details
File GTP.png thumb Guanosine triphosphate GTP File Guanosindiphosphate.png thumb GDP Guanine nucleotide exchange factors GEFs activate monomeric GTPases by stimulating the release of guanosine diphosphate GDP to allow binding of guanosine triphosphate GTP . A variety of unrelated structural domain s have been shown to exhibit guanine nucleotide exchange activity. Some GEFs can activate multiple GTPases while others are specific to a single GTPase. Function File GTPase Activation.png thumb Schematic of GEF activation of a GTPase Guanine Nucleotide Exchange Factors GEFs are proteins involved in the activation of small GTPases . Small GTPases act as molecular switches in intracellular signaling pathways and have many downstream targets. The most well known GTPases comprise the Ras superfamily and are involved in essential cell processes such as cell differentiation and proliferation, cytoskeletal organization, vesicle trafficking, and nuclear transport. ref name Alberts et al 2002 cite book author Bruce Alberts et al title Molecular Biology of the Cell url http www.ncbi.nlm.nih.gov books NBK26822 A2855 accessdate 12 January 2011 year 2002 publisher Garland Science isbn 081533218 pages 877 ref GTPases are active when bound to GTP and inactive when bound to GDP, allowing their activity ... with GDP and stabilize the nucleotide free GTPase until a GTP molecule binds to it. ref name ..., there are some similarities in how different GEFs alter the conformation of the G protein nucleotide ... side of the bound nucleotide. These regions and the phosphate binding loop of the GTPase interact with the phosphates of the nucleotide and a coordinating magnesium ion to maintain high affinity binding of the nucleotide. GEF binding induces conformational changes in the P loop and switch regions ... reflist See also Nucleotide exchange factor Guanine Small GTPases G proteins GTP binding protein regulators ... and gdis MBInfo Glossary Terms GAPs, GEFs, and GDIs DEFAULTSORT Guanine Nucleotide Exchange Factor Category ... more details
The nucleotide universal IDentifier nuID is designed to uniquely and globally identify oligonucleotide microarray probes. br Oligonucleotide probes of microarrays that are sequence identical may have different identifiers between manufacturers and even between different versions of the same company s microarray and sometimes the same identifier is reused and represents a completely different oligonucleotide, resulting in ambiguity and potentially mis identification of the genes hybridizing to that probe. This also makes data interpretation and integration of different batches of data difficult. nuID was designed to solve these problems. It is a unique, non Degeneracy degenerate encoding scheme that can be used as a universal representation to identify an oligonucleotide across manufacturers. The designed of nuID was inspired by the fact that the raw sequence of the oligonucleotide is the true definition of identity for a probe, the encoding algorithm uniquely and non degenerately transforms the sequence itself into a compact identifier a lossless compression . In addition, a redundancy check checksum was added to validate the integrity of the identifier. These two steps, encoding plus checksum, result in an nuID, which is a unique, non degenerate, permanent, robust and efficient representation of the probe sequence. For commercial applications that require the sequence identity to be confidential, encryption schema can also be added for nuID. The utility of nuIDs has been implemented for the annotation of Illumina company Illumina microarrays, which can be downloaded from Bioconductor website http www.bioconductor.org . It also has universal applicability as a source independent naming convention for oligomers. The nuID schema has three significant advantages over using the oligo sequence directly as an identifier first it is more compact due to the base 64 encoding second ... Official Bioconductor Website DEFAULTSORT Nucleotide Universal Identifier Category Microarrays bioinformatics ... more details
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