大肠杆菌分解代谢产物阻遏效应研究进展

doi:10.3724/SP.J.1005.2010.00571

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HEREDITAS ›› 2010, Vol. 32 ›› Issue (6): 571-576.doi: 10.3724/SP.J.1005.2010.00571

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Advances in mechanism of Escherichia coli carbon catabolite re-pression

MA Wan-Qing, ZHANG Zhen, LIU Yue-Lin, WANG Hua-Zhong

Tianjin Key Laboratory of Cyto-Genetical & Molecular Regulation, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China

Received:2009-09-18 Revised:2010-01-13 Online:2010-06-20 Published:2010-05-24
Contact: HuaZhong Wang E-mail:hsxywhz@mail.tjnu.edu.cn

Abstract

Abstract:

Bacteria often sequentially utilize coexisting carbohydrates in environment and firstly select the one (frequently glucose) easiest to metabolize. This phenomenon is known as carbon catabolite repression (CCR). In existing Chinese teaching materials of molecular biology and related courses, unclear or even wrong interpretations are given about CCR mechanism. A large number of studies have shown that rather than the existence of intracellular glucose, CCR is mainly caused by the glucose transport process coupling with glucose phosphorylation via the phosphoenolpyruvate: car bohydrate phosphotransferase system PTS. The transport process leads to accumulation of dephosphorylated form of EⅡA^Glc.This form of EⅡAGlc can bind the membrane-localized LacY protein to block the uptake of lactose inducer. cAMP functions in activation of key genes involved in PTS system to strengthen the role of inducer exclusion. In addition, dephosphorylated form of EⅡB^Glcand YeeⅠ bind global transcription repressor Mlc to ensure the expression of key genes involved in the PTS system. This review summarizes the current advancement in mechanism of Escherichia coli carbon catabolite repression.

Key words: phosphoenolpyruvate:carbohydrate phosphotrans-ferase system, lactose operon, carbon catabolite repression

MA Wan-Qing, ZHANG Zhen, LIU Yue-Lin, WANG Hua-Zhong. Advances in mechanism of Escherichia coli carbon catabolite re-pression[J]. HEREDITAS, 2010, 32(6): 571-576.

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