An asymmetry-to-symmetry switch in signal transmission by the histidine kinase receptor for TMAO.
An asymmetry-to-symmetry switch in signal transmission by the histidine kinase receptor for TMAO.
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DOI:
10.1016/j.str.2012.02.021
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发表时间:
2012-04-04
期刊:
影响因子:
5.7
通讯作者:
Hendrickson, Wayne A.
中科院分区:
文献类型:
--
作者:
Moore, Jason O.;Hendrickson, Wayne A.
The osmoregulator trimethylamine-N-oxide (TMAO), commonplace in aquatic organisms, is used as the terminal electron acceptor for respiration in many bacterial species. The TMAO reductase (Tor) pathway for respiratory catalysis is controlled by a receptor system that comprises the TMAO-binding protein TorT, the sensor histidine kinase TorS and the response regulator TorR. Here we study the TorS/TorT sensor system to gain mechanistic insight into signaling by histidine kinase receptors. We determined crystal structures for complexes of TorS sensor domains with apo TorT and with TorT(TMAO); we characterized TorS sensor associations with TorT in solution; we analyzed the thermodynamics of TMAO binding to TorT-TorS complexes; and we analyzed in vivo responses to TMAO through the TorT/TorS/TorR system to test structure-inspired hypotheses. TorS-TorT(apo) is an asymmetric 2:2 complex that binds TMAO with negative cooperativity to form a symmetric active kinase.
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