OMP peptides modulate the activity of DegS protease by differential binding to active and inactive conformations.

OMP peptides modulate the activity of DegS protease by differential binding to active and inactive conformations.
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DOI:
10.1016/j.molcel.2008.12.017
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发表时间:
2009-01-16
期刊:
影响因子:
16
通讯作者:
Sauer, Robert T.
Sauer, Robert T.
中科院分区:
生物学1区
文献类型:
--
作者:
Sohn, Jungsan;Sauer, Robert T.

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通过检测周质中错误折叠的外膜孔蛋白(OMPs),E。大肠杆菌DegS蛋白酶切割RseA,一种跨膜调节因子,传递信号以激活细胞质基因表达。通过将通常不可接近的OMP序列与DegS-PDZ结构域结合来检测错误折叠,其减轻变构抑制并激活蛋白水解。在这里,我们表明,DegS刺激可以调节由OMP-肽的亲和力的活性和非活性蛋白酶的构象,以及通过优先底物结合到活性DegS。基于PDZ结构域和其他地方的肽结合口袋中的突变的影响,我们建议将肽结合与DegS激活联系起来的变构途径。这些结果解释了对包膜应激的快速反应,表明即使在灾难性条件下,蛋白质解折叠反应也可以通过可接近DegS的肽序列来定制,并提出了通过变构效应物控制相关PDZ蛋白酶的策略。
Upon sensing misfolded outer-membrane porins (OMPs) in the periplasm, the E. coli DegS protease cleaves RseA, a transmembrane regulator, transmitting a signal to activate cytoplasmic gene expression. Misfolding is detected by binding of normally inaccessible OMP sequences to the DegS-PDZ domain, which relieves allosteric inhibition and activates proteolysis. Here, we show that DegS stimulation can be regulated by OMP-peptide affinity for the active and for the inactive protease conformations, as well as by preferential substrate binding to active DegS. Based on the effects of mutations in the peptide-binding pocket of the PDZ domain and elsewhere, we suggest an allosteric pathway that links peptide binding to DegS activation. These results explain fast responses to envelope stress, demonstrate that the protein-unfolding response, even under catastrophic conditions, can be tailored by the peptide sequences that become accessible to DegS, and suggest strategies for control of related PDZ-proteases by allosteric effectors.
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