NMR solution structure of the integral membrane enzyme DsbB: functional insights into DsbB-catalyzed disulfide bond formation.
NMR solution structure of the integral membrane enzyme DsbB: functional insights into DsbB-catalyzed disulfide bond formation.
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DOI:
10.1016/j.molcel.2008.08.028
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发表时间:
2008-09-26
期刊:
影响因子:
16
通讯作者:
Bushweller JH
中科院分区:
文献类型:
--
作者:
Zhou Y;Cierpicki T;Jimenez RH;Lukasik SM;Ellena JF;Cafiso DS;Kadokura H;Beckwith J;Bushweller JH
We describe the first NMR structure of a polytopic helical membrane protein. DsbB, a bacterial cytoplasmic membrane protein, plays a key role in disulfide bond formation. It re-oxidizes DsbA, the periplasmic protein disulfide oxidant, using the oxidizing power of membrane-embedded quinones. We determined the structure of an inter-loop disulfide bond form of DsbB, an intermediate in catalysis. Analysis of the structure and interactions with substrates DsbA and quinone reveals functionally relevant changes induced by these substrates. Analysis of the structure, dynamics measurements, and NMR chemical shifts around the inter-loop disulfide bond suggest how electron movement from DsbA to quinone through DsbB is regulated and facilitated. Our results demonstrate the extraordinary utility of NMR for functional characterization of polytopic integral membrane proteins and provide novel insights into the mechanism of DsbB catalysis.
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