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- Q424219 subject Q6939141.
- Q424219 abstract "Avidin is a tetrameric or dimeric biotin-binding protein produced in the oviducts of birds, reptiles and amphibians and deposited in the whites of their eggs. In chicken egg white, avidin makes up approximately 0.05% of total protein (approximately 1.8 mg per egg). The tetrameric protein contains four identical subunits (homotetramer), each of which can bind to biotin (Vitamin B7, vitamin H) with a high degree of affinity and specificity. The dissociation constant of avidin is measured to be KD ≈ 10−15 M, making it one of the strongest known non-covalent bonds.In its tetrameric form, avidin is estimated to be between 66–69 kDa in size. 10% of the molecular weight is attributed to carbohydrate content composed of four to five mannose and three N-acetylglucosamine residues. The carbohydrate moieties of avidin contain at least three unique oligosaccharide structural types that are similar in structure and composition.Functional avidin is found only in raw egg, as the biotin avidity of the protein is destroyed by cooking. The natural function of avidin in eggs is not known, although it has been postulated to be made in the oviduct as a bacterial growth-inhibitor, by binding biotin helpful for bacterial growth. As evidence for this, streptavidin, a loosely related protein with equal biotin affinity and a very similar binding site, is made by certain strains of Streptomyces bacteria, and is thought to serve to inhibit the growth of competing bacteria, in the manner of an antibiotic.A non-glycosylated form of avidin has been isolated from commercially prepared product; however, it is not conclusive as to whether the non-glycosylated form occurs naturally or is a product of the manufacturing process.".
- Q424219 symbol "Avidin".
- Q424219 thumbnail PDB_1sws_EBI.jpg?width=300.
- Q424219 wikiPageExternalLink e5.full.
- Q424219 wikiPageExternalLink books?id=sMgpDLCl2z8C&pg=PA85.
- Q424219 wikiPageExternalLink 0890585.pdf.
- Q424219 wikiPageExternalLink bj3160193.htm.
- Q424219 wikiPageExternalLink quips?story=avidin.
- Q424219 wikiPageExternalLink pmidlookup?view=long&pmid=326797.
- Q424219 wikiPageExternalLink www.pdbe.org.
- Q424219 wikiPageWikiLink Q10811.
- Q424219 wikiPageWikiLink Q10908.
- Q424219 wikiPageWikiLink Q11358.
- Q424219 wikiPageWikiLink Q1144013.
- Q424219 wikiPageWikiLink Q12187.
- Q424219 wikiPageWikiLink Q17125463.
- Q424219 wikiPageWikiLink Q17147.
- Q424219 wikiPageWikiLink Q181354.
- Q424219 wikiPageWikiLink Q2322731.
- Q424219 wikiPageWikiLink Q273186.
- Q424219 wikiPageWikiLink Q2751330.
- Q424219 wikiPageWikiLink Q284367.
- Q424219 wikiPageWikiLink Q308708.
- Q424219 wikiPageWikiLink Q3147909.
- Q424219 wikiPageWikiLink Q320607.
- Q424219 wikiPageWikiLink Q332126.
- Q424219 wikiPageWikiLink Q335208.
- Q424219 wikiPageWikiLink Q3408232.
- Q424219 wikiPageWikiLink Q36857.
- Q424219 wikiPageWikiLink Q421817.
- Q424219 wikiPageWikiLink Q45422.
- Q424219 wikiPageWikiLink Q483261.
- Q424219 wikiPageWikiLink Q48743.
- Q424219 wikiPageWikiLink Q49213.
- Q424219 wikiPageWikiLink Q5113.
- Q424219 wikiPageWikiLink Q516200.
- Q424219 wikiPageWikiLink Q5203342.
- Q424219 wikiPageWikiLink Q6295225.
- Q424219 wikiPageWikiLink Q6589727.
- Q424219 wikiPageWikiLink Q6939141.
- Q424219 wikiPageWikiLink Q7002946.
- Q424219 wikiPageWikiLink Q731235.
- Q424219 wikiPageWikiLink Q739897.
- Q424219 wikiPageWikiLink Q79460.
- Q424219 wikiPageWikiLink Q8054.
- Q424219 wikiPageWikiLink Q857638.
- Q424219 wikiPageWikiLink Q864228.
- Q424219 wikiPageWikiLink Q864854.
- Q424219 wikiPageWikiLink Q898254.
- Q424219 wikiPageWikiLink Q898365.
- Q424219 wikiPageWikiLink Q899781.
- Q424219 wikiPageWikiLink Q901305.
- Q424219 symbol "Avidin".
- Q424219 type Biomolecule.
- Q424219 type Protein.
- Q424219 type Thing.
- Q424219 type Q206229.
- Q424219 type Q8054.
- Q424219 comment "Avidin is a tetrameric or dimeric biotin-binding protein produced in the oviducts of birds, reptiles and amphibians and deposited in the whites of their eggs. In chicken egg white, avidin makes up approximately 0.05% of total protein (approximately 1.8 mg per egg). The tetrameric protein contains four identical subunits (homotetramer), each of which can bind to biotin (Vitamin B7, vitamin H) with a high degree of affinity and specificity.".
- Q424219 label "Avidin".
- Q424219 depiction PDB_1sws_EBI.jpg.