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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Class II bacteriocin ： ウィキペディア英語版 Class II bacteriocin Class II bacteriocins are a class of small peptides that inhibit the growth of various bacteria. Many Gram-positive bacteria produce ribosomally synthesized antimicrobial peptides, termed bacteriocins. Bacteriocins for which disulfide bonds are the only modification to the peptide are Class II bacteriocins. ==Class IIa== One important and well studied class of bacteriocins is the class IIa or pediocin-like bacteriocins produced by lactic acid bacteria. All class IIa bacteriocins are produced by food-associated strains, isolated from a variety of food products of industrial and natural origins, including meat products, dairy products and vegetables. Class IIa bacteriocins are all cationic, display anti-''Listeria'' activity, and kill target cells by permeabilizing the cell membrane. Class IIa bacteriocins contain between 37 and 48 residues. Based on their primary structures, the peptide chains of class IIa bacteriocins may be divided roughly into two regions: a hydrophilic, cationic and highly conserved N-terminal region, and a less conserved hydrophobic/amphiphilic C-terminal region. The N-terminal region contains the conserved Y-G-N-G-V/L 'pediocin box' motif and two conserved cysteine residues joined by a disulfide bridge. It forms a three-stranded antiparallel beta-sheet supported by the conserved disulfide bridge. This cationic N-terminal beta-sheet domain mediates binding of the class IIa bacteriocin to the target cell membrane. The C-terminal region forms a hairpin-like domain that penetrates into the hydrophobic part of the target cell membrane, thereby mediating leakage through the membrane. The two domains are joined by a hinge, which enables movement of the domains relative to each other.〔〔 Some proteins known to belong to the class IIa bacteriocin family are listed below: * ''Pediococcus acidilactici'' pediocin PA-1. * ''Leuconostoc mesenteroides'' mesentericin Y105. * ''Carnobacterium piscicola'' carnobacteriocin B2. * ''Lactobacillus sakei'' sakacin P. * ''Enterococcus faecium'' enterocin A. * ''Enterococcus faecium'' enterocin P. * ''Leuconostoc gelidum'' leucocin A. * ''Lactobacillus curvatus'' curvacin A. * ''Listeria innocua'' listeriocin 743A. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Class II bacteriocin」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.