Infobox journal title Journal of Lipid Research cover File Jlr cover.gif editor Edward A. Dennis , Joseph L. Witztum discipline Lipid Lipids abbreviation J. Lipid Res. publisher American Society for Biochemistry and Molecular Biology country United States frequency history 1959 present openaccess Delayed, after 12 months license impact 6.115 impact year 2010 website http www.jlr.org link1 http www.jlr.org content current link1 name Online access link2 http www.journals.uchicago.edu loi isis link2 name Online archives link2 link2 name JSTOR OCLC 01589637 LCCN 62001186 CODEN JLPRA ISSN 0022 2275 eISSN 1539 7262 The Journal of Lipid Research is a monthly peer review peer reviewed scientific journal that was established in 1959. Since 2000, it is published by the American Society for Biochemistry and Molecular Biology . ref cite journal author Edward A. Dennis year 2009 title Founding, early history, and transformation of the Journal for Lipid Research to an American Society of Biochemistry and Molecular Biology journal url http www.jlr.org cgi content abstract 50 Supplement S3 journal Journal of Lipid Research volume 50 issue Suppl. pages S3 S8 doi 10.1194 jlr.R800093 JLR200 pmid 19116414 pmc 2674755 ref It covers research on lipid s in health and disease, including lipid function and the biochemical and Genetics genetic regulation of lipid metabolism . The journal also covers patient ... About The Journal of Lipid Research ref The journal is published in print and online. Its editors ... of research on lipids journal Journal of Lipid Research volume 50 issue Suppl. pages S1 doi 10.1194 .... The journal was established in response to the lack of published methodology methodologies in lipid research as perceived by Edward H. Ahrens , Donald Zilversmit , and others, who founded Lipid Research ... of Lipid Research url http www.jlr.org cgi reprint 25 13 1425 journal Journal of Lipid Research ... 41 8 1185 title 2000 Changes in management and publication journal Journal of Lipid Research volume ... more details
Wikify date September 2011 A solid lipid nanoparticle SLN is typically spherical with an average diameter between 10 to 1000 nanometers. Solid lipid nanoparticles possess a solid lipid core matrix that can solubilize lipophilic molecules. The lipid core is stabilized by surfactants emulsifiers . The term lipid is used here in a broader sense and includes triglycerides e.g. tristearin , diglycerides e.g. glycerol bahenate , monoglycerides e.g. glycerol monostearate , fatty acids e.g. stearic acid , steroids e.g. cholesterol , and waxes e.g. cetyl palmitate . All classes of emulsifiers with respect to charge and molecular weight have been used to stabilize the lipid dispersion. It has been found ... et al. , 2001 and Small, 1986 . Development of solid lipid nanoparticles is one of the emerging fields ..., as well as in other discipline. Due to their unique size dependent properties, lipid nanoparticles ... enhancement along with controlled and site specific drug delivery. Solid lipid nanoparticles ... combine the advantages of lipid emulsion and polymeric nanoparticle systems while overcoming the temporal ... production Mehnert et al., 2001 . An SLN is generally spherical in shape and consists of a solid lipid ... having minimum carrier cytotoxicity and the solid state of the lipid permit better controlled drug ... water soluble drugs in the solid lipid matrix. Nanotechnology is expected to revolutionize ... the ocular bioavailability of both hydrophilic and lipophilic drugs. Solid lipid nanoparticles have ... lipid nanoparticles for ocular drug delivery journal Drug delivery year 2010 volume 17 issue 7 pages ...,A., Mishra,A., Muthu,MS., Singh,S. 2010 Studies on development repaglinide loaded solid lipid nanoparticles effect of lipid matrix. Therapeutic delivery 1 1 , 63 73. Rawat, M.K. , Jain, A., Singh,S. 2011 Studies on binary lipid matrix based solid lipid nanoparticles of repaglinide In vitro and in vivo ... In vivo and cytotoxicity evaluation of repaglinide loaded binary solid lipid nanoparticles after ... more details
Infobox Disease Name Lipid storage disorder Image Caption DiseasesDB ICD10 ICD10 E 75 e 70 ICD9 ICD9 272.7 ICDO OMIM MedlinePlus eMedicineSubj ped eMedicineTopic 1310 MeshID D008064 Lipid storage disorders or lipidoses are a group of inherited metabolism metabolic disorders in which harmful amounts of lipid s fats accumulate in some of the body s cell biology cells and tissues. ref name urlLipid Storage Diseases Fact Sheet National Institute of Neurological Disorders and Stroke NINDS cite web url http www.ninds.nih.gov disorders lipid storage diseases detail lipid storage diseases.htm title Lipid Storage Diseases Fact Sheet National Institute of Neurological Disorders and Stroke NINDS format work accessdate ref People with these disorders either do not produce enough of one of the enzyme s needed to metabolize lipids or they produce enzymes that do not work properly. Over time, this excessive storage of fats can cause permanent cellular and tissue damage, particularly in the brain , peripheral nervous system , liver , spleen and bone marrow . Lipid s are broadly defined as any fat soluble ... Lipid storage diseases can be inherited two ways Autosomal recessive inheritance occurs when both parents ... will be carriers for the disorder. Diagnosis of the lipid storage disorders can be achieved ... available to determine if the fetus will have the disease or is a carrier. ref Lipid Storage Diseases ... treatments for lipid storage disorders, however, there are some highly effective enzyme replacement ... may prove to be effective for certain lipid storage disorders. ref Ierardi Curto, Lynne MD, PhD. Lipid Storage Disorders. Medscape. 30 Sept. 2010. 6 Dec 2011. http emedicine.medscape.com .... ref Lipid Storage Diseases Fact Sheet National Institute of Neurological Disorders and Stroke NINDS . ref See also Xanthomatosis Niemann Pick disease References reflist Lipid storage disorders Category Lipid storage disorders pt Lipidose es Lipidosis ... more details
Pfam box Symbol PagL Name Lipid A 3 O deacylase PagL image 2erv.gif width 200 caption Pfam PF09411 InterPro SMART Prosite SCOP 2erv TCDB OPM family 26 OPM protein 2erv PDB PDB 2erv Lipid A deacylase PagL is an outer membrane protein with lipid A 3 O deacylase activity. It forms an 8 stranded beta barrel structure. References Crystal structure and catalytic mechanism of the LPS 3 O deacylase PagL from Pseudomonas aeruginosa. Rutten L, Geurtsen J, Lambert W, Smolenaers JJ, Bonvin AM, de Haan A, van der Ley P, Egmond MR, Gros P, Tommassen J Proc Natl Acad Sci U S A. 2006 103 7071 7076. PMID 16632613 Category Protein domains Category Protein families Category Outer membrane proteins membrane protein stub ... more details
Wikify date October 2010 Infobox disease Name Neutral lipid storage disease Image Chanarin Dorfman Syndrome smear 2009 11 13.JPG Caption ICD10 ICD9 ICDO OMIM 275630 MedlinePlus eMedicineSubj eMedicineTopic DiseasesDB 32708 MeshID Neutral lipid storage disease also known as Chanarin Dorfman syndrome is an autosomal recessive disorder characterized by accumulation of triglycerides in the cytoplasm of leukocytes, muscle, liver, fibroblasts, and other tissues. ref name Fitz2 Freedberg, et al. 2003 . Fitzpatrick s Dermatology in General Medicine . 6th ed. . McGraw Hill. ISBN 0071380760. ref rp 502 ref name Andrews James, William Berger, Timothy Elston, Dirk 2005 . Andrews Diseases of the Skin Clinical Dermatology . 10th ed. . Saunders. ISBN 0721629210. ref rp 564 It can be associated with CGI58 . ref name pmid11590543 cite journal author Lef vre C, Jobard F, Caux F, et al. title Mutations in CGI 58, the gene encoding a new protein of the esterase lipase thioesterase subfamily, in Chanarin Dorfman syndrome journal Am. J. Hum. Genet. volume 69 issue 5 pages 1002 12 year 2001 month November pmid 11590543 pmc 1274347 doi 10.1086 324121 url http linkinghub.elsevier.com retrieve pii S0002 9297 07 61316 0 ref See also List of cutaneous conditions References reflist DEFAULTSORT Neutral Lipid Storage Disease Category Genodermatoses Category Enzyme defects Genodermatoses stub ... more details
enzyme Name lipid A disaccharide synthase EC number 2.4.1.182 CAS number 105843 81 0 IUBMB EC number 2 4 1 182 GO code 0008915 image width caption In enzymology , a lipid A disaccharide synthase EC number 2.4.1.182 is an enzyme that catalysis catalyzes the chemical reaction UDP 2,3 bis 3 hydroxytetradecanoyl glucosamine 2,3 bis 3 hydroxytetradecanoyl beta D glucosaminyl 1 phosphate math rightleftharpoons math UDP 2,3 bis 3 hydroxytetradecanoyl D glucosaminyl 1,6 beta D 2,3 bis 3 hydroxytetradecanoyl beta D glucosaminyl 1 phosphate Thus, the two substrate biochemistry substrates of this enzyme are UDP 2,3 bis 3 hydroxytetradecanoyl glucosamine and 2,3 bis 3 hydroxytetradecanoyl beta D glucosaminyl 1 phosphate, whereas its 2 product chemistry products are uridine diphosphate UDP and 2,3 bis 3 hydroxytetradecanoyl D glucosaminyl 1,6 beta D 2,3 bis 3 hydroxytetradecanoyl beta D glucosaminyl 1 phosphate. This enzyme belongs to the family of glycosyltransferase s, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP 2,3 bis 3 hydroxytetradecanoyl glucosamine 2,3 bis 3 hydroxytet radecanoyl beta D glucosaminyl 1 phosphate 2,3 bis 3 hydroxytetradecanoyl glucosaminyltransferase . This enzyme participates in lipopolysaccharide biosynthesis . References reflist 1 cite journal author Crowell DN, Reznikoff WS, Raetz CR date 1987 title Nucleotide sequence of the Escherichia coli gene for lipid A disaccharide synthase journal J. Bacteriol. volume 169 pages 5727&ndash 34 pmid 2824445 issue 12 pmc 214086 cite journal author Ray BL, Painter G, Raetz CR date 1984 title The biosynthesis of gram negative endotoxin. Formation of lipid A disaccharides from monosaccharide precursors in extracts of Escherichia coli journal J. Biol. Chem. volume 259 pages 4852&ndash 9 pmid 6370995 issue 8 enzyme stub Category EC 2.4.1 Category Enzymes of unknown structure ... more details
Pfam box Symbol LTP seed store tryp amyl inhib Name Plant lipid transfer protein seed storage trypsin alpha amylase inhibitor Pfam PF00234 InterPro IPR003612 SMART SM00499 SCOP PDB PDB 1afh PDB 1b1u PDB 1be2 PDB 1bea PDB 1bfa PDB 1bip PDB 1bwo PDB 1cz2 PDB 1fk0 PDB 1fk1 Plant lipid transfer proteins , also known as plant LTP s or PLTPs, are a group of highly conserved sequence conserved protein s of about 9 kDa found in vascular plant higher plant tissues. ref http content.karger.com ProdukteDB produkte.asp?Doi 53671 ref As its name implies, lipid transfer proteins are responsible for the molecular shuttle shuttling of phospholipid s and other fatty acid groups between cell membrane s. ref name arjournals.annualreviews.org http arjournals.annualreviews.org doi abs 10.1146 annurev.arplant.47.1.627?cookieSet 1&journalCode arplant.2 ref LTPs are also able to bind acyl groups. ref name arjournals.annualreviews.org Other related proteins Plant lipid transfer proteins share the same structural protein domains domain ref name PUB00027659 cite journal author Bonvin AM, Lyu PC, Samuel D, Cheng CS, Lin KF, Liu YN, Hsu ST title Characterization and structural analyses of nonspecific lipid transfer protein 1 from mung bean journal Biochemistry volume 44 issue 15 pages year 2005 pmid 15823028 doi 10.1021 bi047608v ref with seed storage protein s ref name PUB00022470 cite journal author Bruix M, Santoro J, Rico M, Gimenez Gallego G, Pantoja Uceda D title Solution structure of RicC3, a 2S albumin storage protein from Ricinus communis journal Biochemistry volume 42 issue 47 pages year 2003 pmid 14636051 doi 10.1021 bi0352217 ref and trypsin alpha amylase inhibitor s. ref name PUB00025784 ... lipid transfer protein, is a plasma protein that facilitates the transport of cholesteryl ester s and triglyceride ... from peach , is a 9 kDa allergen belonging to the family of lipid transfer proteins. ref http ... and prevent diseases. Commercial importance Lipid transfer protein 1 from barley is responsible ... more details
enzyme Name Lipid phosphate phosphatase EC number 3.1.3.76 CAS number IUBMB EC number 3 1 3 76 GO code image width caption Orphan date February 2009 In enzymology , a lipid phosphate phosphatase EC number 3.1.3.76 is an enzyme that catalysis catalyzes the chemical reaction 9S,10S 10 hydroxy 9 phosphonooxy octadecanoate H sub 2 sub O math rightleftharpoons math 9S,10S 9,10 dihydroxyoctadecanoate phosphate Thus, the two substrate biochemistry substrates of this enzyme are 9S,10S 10 hydroxy 9 phosphonooxy octadecanoate and water H sub 2 sub O , whereas its two product chemistry products are 9S,10S 9,10 dihydroxyoctadecanoate and phosphate . This enzyme belongs to the family of hydrolase s, specifically those acting on phosphoric ester monoester bonds. The systematic name of this enzyme class is 9S,10S 10 hydroxy 9 phosphonooxy octadecanoate phosphohydrolase . Other names in common use include hydroxy fatty acid phosphatase , dihydroxy fatty acid phosphatase , hydroxy lipid phosphatase , sEH ambiguous , and soluble epoxide hydrolase ambiguous . References reflist 1 cite journal author Newman JW, Morisseau C, Harris TR, Hammock BD date 2003 title The soluble epoxide hydrolase encoded by EPXH2 is a bifunctional enzyme with novel lipid phosphate phosphatase activity journal Proc. Natl. Acad. Sci. U.S.A. volume 100 pages 1558&ndash 63 pmid 12574510 doi 10.1073 pnas.0437724100 issue 4 pmc 149871 cite journal author Oesch F, Arand M date 2003 title The N terminal domain of mammalian soluble epoxide hydrolase is a phosphatase journal Proc. Natl. Acad. Sci. U.S.A. volume 100 pages 1552&ndash 7 pmid 12574508 doi 10.1073 pnas.0437829100 issue 4 pmc 149870 cite journal author Morisseau C, Hammock BD date 2005 title Epoxide hydrolases mechanisms, inhibitor designs, and biological roles ..., Morisseau C date 2005 title Lipid sulfates and sulfonates are allosteric competitive inhibitors of the N ... with lipid metabolism journal Prog. Lipid. Res. volume 44 pages 1&ndash 51 pmid 15748653 doi ... more details
reticulum lipid transfer protein involved in the biosynthesis and lipid loading of apolipoprotein ... being the MHC I like lipid antigen presenting molecule ref name PUB00035550 cite journal author Agami ... more details
LDL , Very low density lipoprotein VLDL and chylomicrons . These lipoproteins shield the lipid s from ... content IPR001124 DEFAULTSORT Lipid Binding Serum Glycoprotein Category Protein domains Category ... more details
Orphan date April 2012 Cleanup date May 2010 Stable nucleic acid lipid particles SNALPs are microscopic particles approximately 120 nanometer s in diameter, smaller than the wavelengths of visible light. They have been used to deliver siRNA s therapeutically to mammals in vivo . In SNALPs the siRNA is surrounded by a lipidbilayer containing a mixture of cationic liposome cationic and lipidbilayer fusion fusogenic lipids, coated with diffusible polyethylene glycol . ref Cite journal url http www.nature.com gt journal v13 n7 full 3302661a.html title RNAi therapeutics SNALPing siRNAs in vivo author J.J. Rossi journal Gene Therapy year 2006 volume 13 issue 7 pmid 17526070 pages 583 584 doi 10.1038 sj.gt.3302661 unused data DUPLICATE DATA author J. J. Rossi ref Immunostimulation For purposes of research or treatment, the involvement of pattern recognition receptor s of the innate immune system specifically Toll like receptor s is an inconvenience that greatly reduces the stability of the siRNAs and the required dose of SNALPs. SiRNAs delivered by SNALPs are subject to endosomal trafficking, potentially exposing them to TLR3 and TLR7 , and can lead to activation of interferon s and proinflammatory cytokine s. Methods of preventing this include Preventing immunostimulation by modifying the 2 position of the ribose backbone at certain positions in the siRNA sequence 2 fluoro modified pyrimidine s 2 O methyl modified nucleosides. GU rich sequences often mediate immune recognition, and the methylation of a few 20 of uridine and guanosine positions on the sense strand of a siRNA can be sufficient to prevent inflammatory activity however, such modifications close to the 5 end of the antisense strand can reduce RNAi activity. ref Cite journal url http www.nature.com mt journal v13 n3 full mt200661a.html title Design of Noninflammatory Synthetic siRNA Mediating Potent Gene Silencing in Vivo journal Molecular Therapy author Adam D. Judge et al. year 2006 volume 13 issue 3 pmid 16343994 ... more details
The Stephen S. Chang Award for Lipid or Flavor Science has been awarded every year since 1993. It is awarded to a member of the Institute of Food Technologists IFT who has made significant contributions to lipid or flavor science. This award is named for Stephen S. Chang 1918 1996 , a China Chinese born food science food scientist who later became a food science professor at Rutgers University in New Brunswick, New Jersey specializing in lipid and flavor research. It was the second IFT award to be named for a living person. Award winners receive a USD 3000 honorarium and a Steuben crystal from the Stephen S. Chang Endowment Fund supported by the Taiwan Food Industries SSC . Winners Year Winner 1993 Edward G. Perkins 1994 Gary A. Reineccius 1995 David B. Min 1996 Wassef W. Nawar 1997 John M. deMan 1998 Robert C. Lindsay 1999 W. James Harper 2000 Terry C. Acree 2001 Michael M. Blumenthal 2002 Chi Tang Ho 2003 Gary R. List 2004 Herbert O. Hultin 2005 Fereidoon Shahidi 2006 Eric A. Decker 2007 Keith R. Cadwallader 2008 Casimir C. Akoh 2009 Pamela White 2010 Cameron Faustman References portal Food http members.ift.org IFT Awards AchievmentAwards AwardWinners pastawardwinners.htm List of past winners Official site Category Food technology awards ... more details
Pfam box Symbol PagP Name Antimicrobial peptide resistance and lipid A acylation protein PagP image 1thq opm.gif width caption Pfam PF07017 InterPro IPR009746 SMART Prosite SCOP TCDB OPM family 26 OPM protein 1thq PDB PDB3 1mm5 A 36 183 PDB3 1mm4 A 36 183 PDB3 1thq A 36 183 Antimicrobial peptide resistance and lipid A acylation protein PagP is a Protein family family of several bacterial antimicrobial peptide resistance and lipid A acylation PagP proteins. The bacterial outer membrane enzyme PagP transfers a palmitate chain from a phospholipid to lipid A. In a number of pathogenic Gram negative bacteria , PagP confers resistance to certain cationic antimicrobial peptides produced during the host innate immune response . References 1 . Solution structure and dynamics of the outer membrane enzyme PagP by NMR. Hwang PM, Choy WY, Lo EI, Chen L, Forman Kay JD, Raetz CR, Prive GG, Bishop RE, Kay LE Proc Natl Acad Sci U S A 2002 99 13560 13565. PMID 12357033 Category Protein domains Category Protein families Category Outer membrane proteins membrane protein stub ... more details
The term SUV normally refers to sport utility vehicle s. It can also refer to Standardized Uptake Value , a measure used in Positron Emission Tomography for quantification Liposome Small unilamellar vesicle , a liposome with a single lipid bilayer disambig Category Initialisms de SUV Begriffskl rung fr SUV homonymie it SUV disambigua ... more details
Science 175 1972 720 . In this model, the cell membrane is considered as a lipidbilayer where the lipid ... in the lipidbilayer. Some proteins are called integral membrane protein s because they traverse entirely in the lipidbilayer and play the role of information and matter communications between the interior ... they are partially embedded in the bilayer and accomplish the other biological functions. Beneath the lipid membrane, the membrane skeleton, a network of proteins, links with the proteins in the lipid membrane. Elasticity of lipid vesicles The first step to study the elasticity of cell membranes is to study lipid bilayers. Usually, the thickness of the lipidbilayer is much smaller than the scale of the whole lipidbilayer. It is reasonable to describe the lipidbilayer by a mathematical surface. In 1973, Helfrich Z. Naturforsch. C 28 1973 693 recognized that the lipidbilayer was just ... of the spherical bilayer. Using the shape equation 3 of closed vesilces, Ou Yang predicted that there was a lipid ... as lipidbilayer plus membrane skeleton. The skeleton is a cross linking protein network and joints ... from the lipidbilayer. The last two terms come from the entropic elasticity of the membrane skeleton .... C. Ou Yang, Triconcave Solution to the Helfrich Variation Problem for the Shape of LipidBilayer Vesicles ...A cell membrane defines a boundary between the living cell and its environment. It consists of lipid ... head group and two hydrophobic hydrocarbon tails. When a quantity of lipid molecules disperse in water, they will assemble themselves into a bilayer in which the hydrophilic heads shield the hydrophobic ... area of the bilayer math f c frac k c 2 2H c 0 2 bar k K, math 1 where math k c, bar k math are bending ... free energy free energy of a closed bilayer under the osmotic pressure math Delta p math the outer ... bilayer, respectively. math lambda math is the surface tension of the bilayer. By taking the first ... an equation to describe the equilibrium shape of the bilayer as math Delta p 2 lambda H k c 2H c 0 ... more details
Unreferenced date November 2006 NP 40 is a commercially available detergent . The full name of NP 40 is Tergitol type NP 40, which is nonyl phenoxypolyethoxylethanol. Care should be taken to avoid confusing NP 40 with Nonidet P 40 octyl phenoxypolyethoxylethanol . This detergent is not powerful enough to break the nuclear membrane , but can break the cytoplasmic membrane . As such, it can be used to obtain the cytoplasmic contents of a cellular culture. See also Surfactant Lipid bilayer Detergent DEFAULTSORT Np 40 Category Biochemistry methods Category Non ionic surfactants Biochem stub de Nonoxinol 40 ... more details
Orphan date April 2012 unreferenced date March 2011 Solute pumping is a form of active transport through a cell membrane Solute pumping allows a molecule that cannot regularly cross the lipid bilayer to enter the Cell biology cell by way of a protein channel , however solute pumping requires Adenosine triphosphate ATP to change the shape of the protein channel to allow the molecule to pass through, therefore it is a form of active transport . Category Membrane biology ... more details
In 1935, Hugh Davson and James Danielli proposed a model of the cell membrane in which the phospholipid bilayer lay between two layers of globular protein ref cite doi 10.1002 jcp.1030050409 ref . The phosopholipid bilayer had already been proposed by Gorter and Grendel in 1925 ref cite pmid 19868999 ref , but the Davson Danielli model s flanking proteinaceous layers were novel and intended to explain Danielli s observations on the surface tension of lipid bilayers. It is now known that the phospholipid head groups are sufficient to explain the measured surface tension ref cite doi 10.1083 jcb1682fta2 ref . The Davson Danielli model predominated until Singer and Nicolson advanced the fluid mosaic model in 1972 ref cite pmid 4333397 ref . The fluid mosaic model expanded on the Davson Danielli model by including transmembrane proteins, and eliminated the previously proposed flanking protein layers that were not well supported by experimental evidence. References references Category Cell anatomy it Modello di unit di membrana ... more details
s consist of a phospholipid lipidbilayerbilayer and a variety of proteins that accomplish vital ... bound to the lipidbilayer Peripheral membrane proteins that are temporarily associated with lipidbilayer or with integral membrane proteins Lipid anchored protein s bound to lipidbilayer bound ... with lipidbilayer and become reversibly or irreversibly membrane associated. A slightly different ... states a water soluble and a lipidbilayer bound. The amphitropic protein category includes ... peripheral proteins that interact with other membrane proteins rather than with lipidbilayer ... proteins, they do not interact with the hydrophobic core of the lipidbilayer. Some peripheral ... protein s are temporarily attached either to the lipidbilayer or to integral proteins by a combination ... may be anchored in the lipidbilayer. Polypeptide toxins main Pore forming toxin Polypeptide toxins ... process thermodynamics irreversibly with the lipidbilayer and form alpha helical or beta barrel ... that are attached to the lipidbilayer are consisting of hydrophobic amino acids only. This is done ... surrounding. The portion of the protein that is not touching the lipidbilayer and is protruding out ... in the lipidbilayer http www.mpdb.tcd.ie Membrane PDB Database of 3D structures of integral ... with the bilayer Integral polytopic protein s, also known as transmembrane proteins, are proteins that are permanently attached to the lipid membrane and span across the membrane at least ... outer membrane outer membrane s of Gram negative bacteria , lipid rich cell walls of a few Gram positive ... that are permanently attached to the lipid membrane from only one side and do not span ... in the bilayer membrane. When the protein is left in the membrane bilayer more protein folding ... more details
core surrounded by the complex lipidbilayer . Interdependency of local composition and shape of the bilayer ... , which in aqueous solvents self assembly self assembles into lipidbilayer that closes into a simple lipid vesicle biology vesicle . By addition of at least one bilayer softening component such as a biocompatible surfactant or an amphiphile drug lipidbilayer flexibility and Semipermeable membrane ... s lipidbilayer fusion with the cell membrane , unless the vesicle is taken up actively by the cell ... of each bilayer component to the local stress experienced by the bilayer. In its basic organization ... beneficial consequence of strong bilayer deformability is the increased Transfersome affinity to bind ... hydration. Barrier penetration involves reversible bilayer deformation, but must not compromise ... of a vesicle can be studied by measuring stress or deformation dependent vesicle bilayer elasticity ... a significant transport rate with the vesicles suspension mainly depends on the explored bilayer ... the characteristic bilayer elasticity and permeability values, based on theoretical description ... Ultradeformable Lipid Vesicles can Penetrate the Skin and other Semi Permeable Barriers Intact. Evidence ... mixed lipid vesicles, Transfersomes, liposomes or mixed lipid micelles journal Langmuir ... month February year 2003 title Hydration Driven Transport of Deformable Lipid Vesicles through ... year 2004 title Lipid vesicles and other colloids as drug carriers on the skin journal Advanced Drug ... more details
of lipids a lipidbilayer . New characterization tools over the next few decades would confirm this theory ... float in a fluid lipidbilayer sea . Although simplistic and incomplete, this model is still widely ... the thickness of the hydrocarbon core, not the whole Lipidbilayerbilayer . Gorter and Grendel ... that the cell membrane is a lipidbilayer was correct. A decade later, Davson Danielli model Davson and Danielli proposed a modification to this concept. In their model, the lipidbilayer was coated ... largely of bare lipidbilayer with proteins penetrating either half way or all the way through ... might be made of some sort of fat lipid , but the structure was still unknown. A series of pioneering .... Journal of the Royal Microscopical Society. 1879 2. 592. ref The lipid nature of the cell ... ion pumps . Discovery of bilayer structure Image Annular Gap Junction Vesicle.jpg left thumb 340px A micrograph from a Transmission Electron Micrograph showing a lipid vesicle. The two dark bands are the two leaflets comprising the bilayer. Similar images taken in the 1950s and 1960s confirmed the bilayer nature of the cell membrane Thus, by the early twentieth century the chemical, but not the structural ... membrane is a single molecular layer. Because the Chemical polarity polar lipid headgroups are fully ... showed several problems including an incorrect monolayer pressure, incomplete lipid extraction ... bands were the headgroups and associated proteins of two apposed lipid monolayers. ref name Robertson1960 ... time the bilayer structure had been universally assigned to all cell membranes as well as organelle ... time the development of the first model membrane, the painted bilayer, allowed direct investigation of the properties of a simple artificial bilayer. By painting a reconstituted lipid solution across an aperture, Mueller and Rudin were able to determine that the resulting bilayer exhibited lateral ... bilayer soon became known as a BLM although from the beginning the meaning of this acronym has been ... more details
Unreferenced date December 2009 In biochemistry , the membrane topology of an transmembrane protein describes which portions of the amino acid amino acid sequence of the protein lie within the plane of the surrounding lipid bilayer and which portions protrude into the watery environment on either side. More succinctly, the membrane topology describes which regions of the polypeptide chain span the membrane. Description Because biochemists know the hydrophobicity of amino acids individually, the membrane topology of a protein and indeed whether or not it is an integral membrane protein in the first place often may be predicted accurately on the basis of a protein s sequence alone which of course in turn may be predicted solely from the DNA sequence nucleotide sequence of a gene . Such predictions are most reliably based on the assumption that the lipid bilayer spanning portions of a transmembrane protein will assume an transmembrane helix alpha helical secondary structure . Since membrane topology is frequently the first available structural information about a protein after sequencing, integral membrane proteins are often classified or grouped according to this feature. In classifying proteins in this way, biologists look at the number of times the peptide chain is predicted to cross the membrane and may in fact name a class on this basis e.g. G protein coupled receptor 7TM receptors . Membrane topology predictions also can be invaluable for developing antibodies, drugs or other reagents that will bind and or affect the function of the protein. DEFAULTSORT Membrane Topology Category Integral membrane proteins Category Membrane biology ... more details
In biology, the membrane fluidity refers to the viscosity of the lipidbilayer of a cell membrane . The membrane phospholipid s incorporate fatty acid s of varying length and Saturation chemistry saturation . Shorter chain fatty acids, and ones with greater unsaturation, are less stiff, less viscous and have lower melting points . Changes in membrane dependent functions, such as phagocytosis and cell signalling , are hypothesized to depend upon the cell membrane fluidity. ref name pmid12646388 cite journal author Helmreich EJ title Environmental influences on signal transduction through membranes a retrospective mini review journal Biophysical chemistry volume 100 issue 1 3 pages 519 34 year 2003 pmid 12646388 doi 10.1016 S0301 4622 02 00303 4 url ref This hypothesis lost favor, but has re emerged recently with the discovery of discrete lipid domains, dubbed lipid rafts in cellular membranes ref name pmid15139814 cite journal author Simons K, Vaz WL title Model systems, lipid rafts, and cell membranes journal Annual review of biophysics and biomolecular structure volume 33 issue pages 269 95 year 2004 pmid 15139814 doi 10.1146 annurev.biophys.32.110601.141803 url ref See also Homeoviscous adaptation References Reflist 2 Category Membrane biology Category Lipids biochem stub ... more details
is approximately same with the hydrophobic core of lipidbilayer. At the same time, the protein embedded ... on lactose permease of E. coli showed that upon reconstitution of the protein in PE PG 3 1 lipidbilayer ... was accompanied by a decrease in lipid order, which results in a decrease in bilayer thickness, suggesting ... could be induced by modulating bilayer thickness via addition of cholesterol or by increasing lipid ... for the conformation of peptides and proteins in lipidbilayer, small membrane spanning peptides ... between the hydrophobic parts of the lipidbilayer and the proteins. The excess hydrophobic effect ... lipidbilayer phase transition. This version of the model provides a connection between the microscopic ... bilayer thickness. Structure and organization A biological membrane is a kind of amphipathic layer that acts as a barrier within or around a cell. In most case, it is a lipidbilayer, composed of a double layer of lipid molecules and proteins that may constitute close to 50 of membrane content ... with the lipids inside membrane bilayer is of great importance for membrane function. ref Dumas .... J. 1993, 65, 1795 1809. ref Since proteins are relatively rigid, whereas lipid hydrocarbon chains ... of the lipid chains ref Nezil, F. A. Bloom, M. Biophys. J. 1992, 61, 1176 1183. ref ref ... protein is too large to match the hydrophobic bilayer thickness left part of Figure ..., thereby disrupting the bilayer organization. When the hydrophobic part of a transmembrane protein is too small to match the hydrophobic bilayer thickness right part of Figure , again this might ... could decrease the effective bilayer thickness by disordering their acyl chains or disrupt the bilayer ... that a hydrophobic mismatch can lead to protein aggregation in fluid bilayer were founded. ref Lewis ..., and that bilayer thicknesses of 4 angstrom thicker and 10 angstrom thinner than the estimated hydrophobic ... times, changes in helical tilt may occur with little effect on lipid packing. However, for a single ... more details
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