Structural characterization of the complex of SecB and metallothionein-labeled proOmpA by cryo-electron microscopy.
Structural characterization of the complex of SecB and metallothionein-labeled proOmpA by cryo-electron microscopy.
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通过冷冻电子显微镜对 SecB 和金属硫蛋白标记的 proOmpA 复合物进行结构表征
DOI:
10.1371/journal.pone.0047015
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Sui SF
中科院分区:
文献类型:
--
作者:
Zhou Q;Sun S;Tai P;Sui SF
ProOmpA is a preprotein that is translocated across the plasma membrane by the general secretory pathway in Escherichia coli. The molecular chaperon SecB in Sec pathway can recognize and bind proOmpA for its translocation. However, the structure of the SecB/proOmpA complex remains unknown. Here, we constructed an uncleavable proOmpA fused with metallothionein at its C-terminus and labeled it with metals in vitro for the study of cryo-electron microscopy. Using single particle cryo-electron microscopy, we reconstructed 3D structure of the stable SecB/proOmpA complex. The structure shows that the major portion of preprotein locates on one side of SecB tetramer, resulting in an asymmetric binding pattern. This work also provides a possible approach to the structure determination of small protein complexes by cryo-electron microscopy.
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