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Crystal structure and biophysical properties of Bacillus subtilis BdbD
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Crow, Allister, Lewin, Allison, Hecht, Oliver, Carlsson Möller, Mirja, Moore, Geoffrey R., Hederstedt, Lars and Le Brun, Nick E. (2009) Crystal structure and biophysical properties of Bacillus subtilis BdbD. Journal of Biological Chemistry, 284 (35). pp. 23719-23733. doi:10.1074/jbc.M109.005785 ISSN 0021-9258.
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Official URL: http://dx.doi.org/10.1074/jbc.M109.005785
Abstract
BdbD is a thiol:disulfide oxidoreductase (TDOR) from Bacillus subtilis that functions to introduce disulfide bonds in substrate proteins/peptides on the outside of the cytoplasmic membrane and, as such, plays a key role in disulfide bond management. Here we demonstrate that the protein is membrane-associated in B. subtilis and present the crystal structure of the soluble part of the protein lacking its membrane anchor. This reveals that BdbD is similar in structure to Escherichia coli DsbA, with a thioredoxin-like domain with an inserted helical domain. A major difference, however, is the presence in BdbD of a metal site, fully occupied by Ca2+, at an inter-domain position some 14 Å away from the CXXC active site. The midpoint reduction potential of soluble BdbD was determined as −75 mV versus normal hydrogen electrode, and the active site N-terminal cysteine thiol was shown to have a low pKa, consistent with BdbD being an oxidizing TDOR. Equilibrium unfolding studies revealed that the oxidizing power of the protein is based on the instability introduced by the disulfide bond in the oxidized form. The crystal structure of Ca2+-depleted BdbD showed that the protein remained folded, with only minor conformational changes. However, the reduced form of Ca2+-depleted BdbD was significantly less stable than reduced Ca2+-containing protein, and the midpoint reduction potential was shifted by approximately −20 mV, suggesting that Ca2+ functions to boost the oxidizing power of the protein. Finally, we demonstrate that electron exchange does not occur between BdbD and B. subtilis ResA, a low potential extra-cytoplasmic TDOR.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
Journal or Publication Title: | Journal of Biological Chemistry | ||||||
Publisher: | American Society for Biochemistry and Molecular Biology | ||||||
ISSN: | 0021-9258 | ||||||
Official Date: | 2009 | ||||||
Dates: |
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Volume: | 284 | ||||||
Number: | 35 | ||||||
Page Range: | pp. 23719-23733 | ||||||
DOI: | 10.1074/jbc.M109.005785 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
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