上降充通大粤 .5.1 Mechanism of Repression:Repressor and corepressor阻遏物与共阻遏物 arg Promoter)arg Operator argC argB argH RNA polymerase Transcription proceeds (a) Repressor 2012 Pearson Education,Inc. Transcription of the operon occurs because the repressor is unable to bind to the operator..阻遏蛋白不能与操纵基因结 合，所以操纵子可转录 Chen Feng,Shanghai Jiao Tong UniversityChen Feng, Shanghai Jiao Tong University 8.5.1 Mechanism of Repression: Repressor and corepressor 阻遏物与共阻遏物 Transcription of the operon occurs because the repressor is unable to bind to the operator.阻遏蛋白不能与操纵基因结 合,所以操纵子可转录