Cys-scanning disulfide crosslinking and bayesian modeling probe the transmembrane signaling mechanism of the histidine kinase, PhoQ.

Cys-scanning disulfide crosslinking and bayesian modeling probe the transmembrane signaling mechanism of the histidine kinase, PhoQ.
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DOI:
10.1016/j.str.2014.04.019
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发表时间:
2014-09-02
期刊:
影响因子:
5.7
通讯作者:
DeGrado, William F.
DeGrado, William F.
中科院分区:
生物学2区
文献类型:
--
作者:
Molnar, Kathleen S.;Bonomi, Massimiliano;Pellarin, Riccardo;Clinthorne, Graham D.;Gonzalez, Gabriel;Goldberg, Shalom D.;Goulian, Mark;Sali, Andrej;DeGrado, William F.

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Bacteria transduce signals across the membrane using two-component systems (TCSs), consisting of a membrane-spanning sensor histidine kinase and a cytoplasmic response regulator. In Gram negative bacteria, the PhoPQ TCS senses cations and antimicrobial peptides, yet little is known about the structural changes involved in transmembrane signaling. We construct a model of PhoQ signal transduction using Bayesian inference, based on disulfide crosslinking data and homologous crystal structures. The data are incompatible with a single conformation but are instead consistent with two interconverting structures. These states differ in membrane depth of the periplasmic acidic patch and the reciprocal displacement of diagonal helices along the dimer interface. Studies of multiple histidine kinases suggest this repacking might be a common mode of signal transduction in sensor His-kinase receptors. Since a similar scissors model has been ruled out in CheA-linked chemoreceptors, the new evidence suggests that sensor His-kinase and CheA-linked receptors possess different signaling mechanisms.
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