Dynamic nature of disulphide bond formation catalysts revealed by crystal structures of DsbB

Kenji Inaba, Satoshi Murakami, Atsushi Nakagawa, Hiroka Iida, Mai Kinjo, Koreaki Ito, Mamoru Suzuki

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

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 Å 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 α-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.

Original languageEnglish
Pages (from-to)779-791
Number of pages13
JournalEMBO Journal
Volume28
Issue number6
DOIs
Publication statusPublished - 2009 Mar 18
Externally publishedYes

Keywords

  • Crystal structure analysis
  • Disulphide bond
  • DsbA
  • DsbB
  • Membrane protein

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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