REGULATION OF THE ESCHERICHIA-COLI HEAT-SHOCK RESPONSE

被引:284
作者
BUKAU, B
机构
[1] Universität Heidelberg, Zentrum für Molekulare Biologie, Heidelberg, D-69120
关键词
D O I
10.1111/j.1365-2958.1993.tb01727.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Steady-state- and stress-induced expression of Escherichia coli heat-shock genes is regulated at the transcriptional level through controls of concentration and activity of the positive regulator, the heat-shock promoter-specific subunit of RNA polymerase, sigma32. Central to these controls are functions of the DnaK, DnaJ, GrpE heat-shock proteins as negative modulators that mediate degradation as well as repression of activity and, in some conditions, of synthesis of sigma32. DnaJ has a key role in modulation since it binds sigma32 and, jointly with DnaK and GrpE, represses its activity. Furthermore, DnaJ is capable of binding heat-damaged proteins, targeting DnaK and GrpE to these substrates, and thereby mediating DnaK-, DnaJ-, GrpE-dependent repair. It is proposed that one important signal transduction pathway that converts stress to a heat-shock response relies on the sequestering of DnaJ through binding to damaged proteins which derepresses and stabilize sigma32. Damage repair ameliorates the inducing signal and frees DnaJ, DnaK, GrpE to shut off the heat-shock response.
引用
收藏
页码:671 / 680
页数:10
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