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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 Nif regulon ： ウィキペディア英語版 Nif regulon thumb ''Klebsiella pneumoniae'' is a coliform bacterium that is capable of nitrogen fixation under anaerobic and microaerophilic conditions. Nitrogen fixation is regulated by nif regulon, which is a set of seven operons which includes 17 nif genes. The nif regulon is situated between the his and the Shi-A operon of the bacterium. ==Nitrogen Fixation== Nitrogen fixation is catalysed by the ''nitrogenase'' enzyme.Nitrogenase is made up of two soluble proteins :component I and II. Component I known as MoFe protein or nitrogenase contains 2 Mo atoms, 28 to 34 non-heme Fe atoms, and 26 to 28 acid-labile sulfides. Component I is composed of two copies each of two subunits (α and β);each subunit’s stability depends on the other in vivo.Component II known as Fe protein or nitrogenase reductase is composed of two copies of a single subunit. This protein has four non-heme Fe atoms and four acid-labile sulfides. Substrate binding and reduction take place oncomponent I.The role of component II is to supply electrons,one at a time to component I.Nitrogen fixation requires ATP due to high activation energy. ATP is not hydrolyzed to ADP until component II transfers an electron to component I. 21-25 ATPs are required for each N2 fixed. 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「Nif regulon」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.