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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 Sirohaem synthase ： ウィキペディア英語版 Sirohaem synthase In molecular biology, sirohaem synthase (or siroheme synthase) (CysG) is a multi-functional enzyme with S-adenosyl-L-methionine (SAM)-dependent bismethyltransferase, dehydrogenase and ferrochelatase activities. Bacterial sulphur metabolism depends on the iron-containing porphinoid sirohaem. CysG synthesizes sirohaem from uroporphyrinogen III via reactions which encompass two branchpoint intermediates in tetrapyrrole biosynthesis, diverting flux first from protoporphyrin IX biosynthesis and then from cobalamin (vitamin B12) biosynthesis. CysG is a dimer. Its dimerisation region is 74 amino acids long, and acts to hold the two structurally similar protomers held together asymmetrically through a number of salt-bridges across complementary residues within the dimerisation region. CysG dimerisation produces a series of active sites, accounting for CysG's multi-functionality, catalysing four diverse reactions: *Two SAM-dependent methylations *NAD+-dependent tetrapyrrole dehydrogenation *Metal chelation ==References== 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「Sirohaem synthase」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.