Download MendeleySolution structure and backbone dynamics of the cysteine 103 to serine mutant of the N-terminal domain of DsbD from Neisseria meningitidis.
Quinternet, M., Tsan, P., Selme, L., Beaufils, C., Jacob, C., Boschi-Muller, S., Averlant-Petit, M.C., Branlant, G., Cung, M.T.(2008) Biochemistry 47: 12710-12720
- PubMed: 18983169
- DOI: https://doi.org/10.1021/bi801343c
- Primary Citation of Related Structures:
2K0R - PubMed Abstract:
The DsbD protein is essential for electron transfer from the cytoplasm to the periplasm of Gram-negative bacteria. Its N-terminal domain dispatches electrons coming from cytoplasmic thioredoxin (Trx), via its central transmembrane and C-terminal domains, to its periplasmic partners: DsbC, DsbE/CcmG, and DsbG. Previous structural studies described the latter proteins as Trx-like folds possessing a characteristic C-X-X-C motif able to generate a disulfide bond upon oxidation. The Escherichia coli nDsbD displays an immunoglobulin-like fold in which two cysteine residues (Cys103 and Cys109) allow a disulfide bond exchange with its biological partners.We have determined the structure in solution and the backbone dynamics of the C103S mutant of the N-terminal domain of DsbD from Neisseria meningitidis. Our results highlight significant structural changes concerning the beta-sheets and the local topology of the active site compared with the oxidized form of the E. coli nDsbD. The structure reveals a "cap loop" covering the active site, similar to the oxidized E. coli nDsbD X-ray structure. However, regions featuring enhanced mobility were observed both near to and distant from the active site, revealing a capacity of structural adjustments in the active site and in putative interaction areas with nDsbD biological partners. Results are discussed in terms of functional consequences.
Organizational Affiliation:
Laboratoire de Chimie Physique Macromoleculaire, UMR 7568 CNRS-INPL, Nancy Universite, 1 rue Grandville, B.P. 20451, 54001 Nancy cedex, France.
