Journal
EMBO JOURNAL
Volume 28, Issue 6, Pages 779-791Publisher
WILEY
DOI: 10.1038/emboj.2009.21
Keywords
crystal structure analysis; disulphide bond; DsbA; DsbB; membrane protein
Categories
Funding
- Japan Society for the Promotion of Science
- MEXT
- CREST from Japan Science and Technology Agency
- MEXT, Japan
- Kyushu University Interdisciplinary Program in Education and Projects in Research Development
- Grants-in-Aid for Scientific Research [19GS0314, 20247020] Funding Source: KAKEN
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In the Escherichia coli system catalysing oxidative protein folding, disulphide bonds are generated by the cooperation of DsbB and ubiquinone and transferred to substrate proteins through DsbA. The structures solved so far for different forms of DsbB lack the Cys104-Cys130 initial-state disulphide that is directly donated to DsbA. Here, we report the 3.4 angstrom crystal structure of a DsbB-Fab complex, in which DsbB has this principal disulphide. Its comparison with the updated structure of the DsbB-DsbA complex as well as with the recently reported NMR structure of a DsbB variant having the rearranged Cys41-Cys130 disulphide illuminated conformational transitions of DsbB induced by the binding and release of DsbA. Mutational studies revealed that the membrane-parallel short alpha-helix of DsbB has a key function in physiological electron flow, presumably by controlling the positioning of the Cys130-containing loop. These findings demonstrate that DsbB has developed the elaborate conformational dynamism to oxidize DsbA for continuous protein disulphide bond formation in the cell.
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