mergeto gene mapping date March 2011 Unreferenced date December 2009 A gene map is the descriptive representation of the structure of a single gene . It includes the DNA sequence of a gene with intron s and exon s, Directionality molecular biology 3 or 5 transcribed untranslated regions, termination poly adenylation signal, regulatory elements such as promoter biology promoter s, Enhancer genetics enhancer s and it may include known mutation s defining alternative allele s of the same gene. See also Genetic linkage the pattern of genetic linkage for a chromosome or other stretch of genes can be represent as a linkage map also called a genetic map , and the generation of such linkage maps is known as mapping genes . DEFAULTSORT Gene Map Category Genetic mapping Category Genetics Genetics stub fa ja ... more details
Aminoacyl tRNA is Transfer RNA tRNA also known as transfer ribonucleic acid to which its cognated amino acid is adhered. Its role is to deliver the amino acid to the ribosome where it will be incorporated into the polypeptide chain that is being produced. ref name Stryer 2006 cite book author Berg J, Tymoczko JL, Stryer L title Biochemistry publisher W. H. Freeman edition 6th ed. location San Francisco year 2006 isbn 0 7167 8724 5 ref A specific amino acid is added to each tRNA, which is crucial since it means that only that particular amino acid will be incorporated when the anticodon of that tRNA fits can form a transient base pair with the next codon of the Messenger RNA mRNA that is being translated into protein. The specific linkage of the correct amino acid to each tRNA is accomplished by aminoacyl tRNA synthetase s. Due to the degeneracy of the genetic code , some of the different tRNAs have the same amino acid attached to them. Synthesis Aminoacyl tRNA also known as charged tRNA is produced in two steps amino acid activation and transfer. The first step is the adenylation of the amino acid, which forms aminoacyl AMP Amino acid ATP Aminoacyl AMP PP sub i sub Then, the amino acid residue is transferred to the tRNA Aminoacyl AMP tRNA Aminoacyl tRNA AMP The net reaction is Amino acid ATP tRNA Aminoacyl tRNA AMP PP sub i sub The net reaction is only energetically favourable because the pyrophosphate is hydrolysed that reaction is highly energetically favourable and drives the other reactions. All of these reactions take place inside the aminoacyl tRNA synthetase specific for that tRNA. Drugs that target aminoacyl tRNA binding to ribosomal subunit Certain drugs like tetracycline prevent the aminoacyl tRNA from binding to the ribosomal subunit in prokaryotes . References See http en.wikipedia.org wiki Wikipedia Footnotes for a discussion of different citation methods and how to generate footnotes using the ref & ref tags and the Reflist template Reflist See also Am ... more details
enzyme Name RNA 3 phosphate cyclase EC number 6.5.1.4 CAS number 85638 41 1 IUBMB EC number 6 5 1 4 GO code 0003963 image width caption In enzymology , a RNA 3 phosphate cyclase EC number 6.5.1.4 is an enzyme that catalysis catalyzes the chemical reaction ATP RNA 3 terminal phosphate math rightleftharpoons math AMP diphosphate RNA terminal 2 ,3 cyclic phosphate Thus, the two substrate biochemistry substrates of this enzyme are adenosine triphosphate ATP and RNA 3 terminal phosphate , whereas its 3 product chemistry products are adenosine monophosphate AMP , diphosphate , and RNA terminal 2 ,3 cyclic phosphate . This enzyme belongs to the family of ligase s, specifically those forming phosphoric ester bonds. The systematic name of this enzyme class is RNA 3 phosphate RNA ligase cyclizing, AMP forming . This enzyme is also called RNA cyclase . Structural studies As of 2010, three tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB2 1QMH and PDB2 1QMI , un adenylation adenylated ref name pmid10673421 cite journal author Palm GJ, Billy E, Filipowicz W, Wlodawer A title Crystal structure of RNA 3 terminal phosphate cyclase, a ubiquitous enzyme with unusual topology journal Structure volume 8 issue 1 pages 13 23 year 2000 month January pmid 10673421 doi 10.1016 S0969 2126 00 00076 9 url ref and PDB2 3KGD adenylated . ref name pmid20399182 cite journal author Tanaka N, Smith P, Shuman S title Structure of the RNA 3 phosphate cyclase adenylate intermediate illuminates nucleotide specificity and covalent nucleotidyl transfer journal Structure volume 18 issue 4 pages 449 57 year 2010 month March pmid 20399182 pmc 2858066 doi 10.1016 j.str.2010.01.016 url ref References reflist Further reading refbegin cite journal author Filipowicz W, Konarska M, Gross HJ, Shatkin AJ date 1983 title RNA 3 terminal phosphate cyclase activity and RNA ligation in HeLa cell extract journal Nucleic. Acids. Res. volume 11 pages 14 ... more details
Infobox protein family Symbol FAD syn Name FAD synthetase image PDB 1s4m EBI.jpg width caption crystal structure of flavin binding to fad synthetase from thermotoga maritina Pfam PF06574 Pfam clan CL0119 InterPro IPR015864 SMART PROSITE MEROPS SCOP 1n05 TCDB OPM family OPM protein CAZy CDD In molecular biology, the prokaryotic riboflavin biosynthesis protein is a bifunctional enzyme found in bacteria . Riboflavin is converted into catalyst catalytically active Cofactor biochemistry cofactors FAD and FMN by the actions of riboflavin kinase EC number 2.7.1.26 , which converts it into FMN, and FAD synthetase EC number 2.7.7.2 , which Adenylation adenylates FMN to FAD. Eukaryotes usually have two separate enzymes, while most prokaryotes have a single bifunctional protein that can carry out both catalyses, although exceptions occur in both cases. While eukaryotic monofunctional riboflavin kinase is orthologous to the bifunctional prokaryotic enzyme , the monofunctional FAD synthetase differs from its Prokaryote prokaryotic counterpart, and is instead related to the PAPS reductase family. ref name pmid14580199 cite journal author Karthikeyan S, Zhou Q, Osterman AL, Zhang H title Ligand binding induced conformational changes in riboflavin kinase structural basis for the ordered mechanism journal Biochemistry volume 42 issue 43 pages 12532 8 year 2003 month November pmid 14580199 doi 10.1021 bi035450t url ref ref name pmid17049878 cite journal author Galluccio M, Brizio C, Torchetti EM, Ferranti P, Gianazza E, Indiveri C, Barile M title Over expression in Escherichia coli, purification and characterization of isoform 2 of human FAD synthetase journal Protein Expr. Purif. volume 52 issue 1 pages 175 81 year 2007 month March pmid 17049878 doi 10.1016 j.pep.2006.09.002 url ref The bacteria l FAD synthetase that is part of the bifunctional enzyme has remote similarity to nucleotidyl transferase s and, hence, it may be involved in the adenylylation reaction of FAD synthetases. r ... more details
Streptogramin B is a subgroup of the streptogramin antibiotics family. These natural products are cyclic hexa or hepta depsipeptides produced by various members of the genus of bacteria Streptomyces . Many of the members of the streptogramins reported in the literature have the same structure and different names for example, pristinamycin IA vernamycin B mikamycin B osteogrycin B. ref name oxazolidinone Cite journal title Streptogramins, oxazolidinones, and other inhibitors of bacterial protein synthesis doi 10.1021 cr030110z year 2005 journal Chem. Rev pages 529 542 volume 105 issue 2 last1 Mukhtar first1 T.A. last2 Wright first2 G.D. pmid 15700955 postscript . ref Biosynthesis The biosynthesis of streptogramin B is carried out by large multifunctional enzymes called non ribosomal peptide synthetases NRPS . In the NRPS system, each amino acid is activated as an aminoacyladenylate and is linked to the enzyme as a thioester with a phosphopantetheinyl group. An elongation reaction then occurs by transferring the activated carboxyl to the amino group in the next amino acid, thus executing the N to C stepwise condensation. NRPSs contain several modules on a single polypeptide. Each of these modules can catalyze activation, condensation and a modification reaction specific to one kind of amino acid. ref name pmid9511056 cite journal author Cocito C, Di Giambattista M, Nyssen E, Vannuffel P title Inhibition of protein synthesis by streptogramins and related antibiotics journal J. Antimicrob. Chemother. volume Suppl A issue pages 7 13 series 39 year 1997 month May pmid 9511056 doi url postscript . ref A typical elongation module consists of an adenylation domain A , a peptidyl carrier protein domain PCP and a condensation domain C . Some other domains may be present that are responsible for modifications to the residues, such as epimerization domain E and N methyltransferase domain MT . The domain responsible for the termination is the thioesterase domain TE located in th ... more details
for adenylation A , peptityl carrier protein PCP , condensation C , and depending on the amino acid position, an epimerization E . The adenylation subdomain is used in activating the specific ... more details
ubiquitin C terminal acyl adenylation. ref name Zeynep cite journal author Tokg z Z, Bohnsack RN ... for adenylation of ubiquitin and subsequent ubiquitin binding to E1. File Ubiquitylation.png ... more details
due to adenylation and deadenylation ref Shapiro, Bennett M. and E. R. Stadtman 1970 . The Regulation ... based on the binding of specific divalent cations and is also related to adenylation ref Shapiro, Bennett .... 24 501 524 ref . Glutamine synthase actiivty is also inhibited via adenylation. The adenylation actividty ... and a regulatory protein called PII act together to stimulate adenylation ref White, David. 2007 . The Physiology ... more details
TOCright Deoxyribozymes or DNA enzymes or catalytic DNA , or DNAzymes are deoxyribonucleic acid DNA molecules with catalyst catalytic action. In contrast to the RNA ribozyme that has many catalytic capabilities, DNA is only associated with gene DNA replication replication and nothing else. The reasons are that DNA lacks specific functional group s and that DNA prefers the double coil conformation in which potential catalytic sites are shielded. In comparison to protein s built up from 20 different monomer s both RNA and DNA have a much more restricted set of monomers 4 to choose from which limits the construction of interesting catalytic sites. For these reasons DNAzymes exist only in the laboratory. Discovery The first deoxyribozyme was discovered in 1994 ref cite journal journal Chem Biol. year 1994 month December volume 1 issue 4 pages 223 9 title A DNA enzyme that cleaves RNA author Breaker RR, coauthors Joyce GF. pmid 9383394 doi 10.1016 1074 5521 94 90014 0 ref by current Yale Professor Ronald R. Breaker while a postdoctoral fellow in the laboratory of Prof. Gerald Joyce at The Scripps Research Institute in La Jolla, CA. This deoxyribozyme assists in lead ion dependent RNA cleaving operations. Catalytic amplification was found to be 100 fold compared to the uncatalysed reaction. Many other deoxyribozymes have since been developed that catalyse DNA phosphorylation, DNA adenylation , DNA deglycosylation , porphyrin metalation , thymine dimer photoreversion and DNA cleavage. Of particular interest are DNA ligase s. ref cite journal title Deoxyribozymes DNA catalysts for bioorganic chemistry author Scott K. Silverman journal Org. Biomol. Chem. year 2004 volume 2 pages 2701 06 url http www.scs.uiuc.edu scott SilvermanPub30.pdf format PDF doi 10.1039 B411910J pmid 15455136 issue 19 ref These molecules have demonstrated remarkable chemoselectivity in RNA branching reactions. Although each repeating unit in a RNA strand owns a free hydroxyl group, the DNA ligase takes ... more details
type enzyme is controlled by the adenylation of a tyrosine residue. The adenylated enzyme is inactive ... class I, adenylation site ref Class II enzymes GSII are found in eukaryotes and in bacteria belonging ... more details
Firefly luciferase generates light from luciferin in a multistep process. First, D luciferin is adenylation ... 12681517 doi url ref In both pathways, luciferase initially catalyzes an adenylation reaction with MgATP ... more details
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