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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 Cro repressor family ： ウィキペディア英語版 Cro repressor family In molecular biology, the Cro repressor family of proteins includes the bacteriophage lambda Cro repressor. Bacteriophage lambda encodes two repressors: the Cro repressor that acts to turn off early gene transcription during the lytic cycle, and the lambda or cI repressor that is required to maintain lysogenic growth. Together the Cro and cI repressors form a helix-turn-helix (HTH) superfamily. The lambda Cro repressor binds to DNA as a highly flexible dimer. The crystal structure of the lambda Cro repressor reveals a HTH DNA-binding protein with an alpha/beta fold that differs from other Cro family members, possibly by an evolutionary fold change. Most Cro proteins, such as Enterobacteria phage P22 Cro and Bacteriophage 434 Cro, have an all-alpha structure that is thought to be ancestral to lambda Cro, where the fourth and fifth helices are replaced by a beta-sheet, possibly as a result of secondary structure switching rather than by nonhomologous replacement. ==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「Cro repressor family」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.