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2IJY

NMR structure ensemble for the reduced DsbA disulphide oxidoreductase from Vibrio Cholerae

Summary for 2IJY
Entry DOI10.2210/pdb2ijy/pdb
NMR InformationBMRB: 7360
DescriptorThiol:disulfide interchange protein dsbA (1 entity in total)
Functional Keywordsthioredoxin domain, helical domain insert, oxidoreductase
Biological sourceVibrio cholerae
Cellular locationPeriplasm: P32557
Total number of polymer chains1
Total formula weight20495.37
Authors
Horne, J.H.,Velkov, T.,Scanlon, M.J. (deposition date: 2006-10-02, release date: 2007-07-17, Last modification date: 2024-05-29)
Primary citationHorne, J.,d'Auvergne, E.J.,Coles, M.,Velkov, T.,Chin, Y.,Charman, W.N.,Prankerd, R.,Gooley, P.R.,Scanlon, M.J.
Probing the Flexibility of the DsbA Oxidoreductase from Vibrio cholerae-a (15)N - (1)H Heteronuclear NMR Relaxation Analysis of Oxidized and Reduced Forms of DsbA.
J.Mol.Biol., 371:703-716, 2007
Cited by
PubMed Abstract: We have determined the structure of the reduced form of the DsbA oxidoreductase from Vibrio cholerae. The reduced structure shows a high level of similarity to the crystal structure of the oxidized form and is typical of this class of enzyme containing a thioredoxin domain with an inserted alpha-helical domain. Proteolytic and thermal stability measurements show that the reduced form of DsbA is considerably more stable than the oxidized form. NMR relaxation data have been collected and analyzed using a model-free approach to probe the dynamics of the reduced and oxidized states of DsbA. Akaike's information criteria have been applied both in the selection of the model-free models and the diffusion tensors that describe the global motions of each redox form. Analysis of the dynamics reveals that the oxidized protein shows increased disorder on the pico- to nanosecond and micro- to millisecond timescale. Many significant changes in dynamics are located either close to the active site or at the insertion points between the domains. In addition, analysis of the diffusion data shows there is a clear difference in the degree of interdomain movement between oxidized and reduced DsbA with the oxidized form being the more rigid. Principal components analysis has been employed to indicate possible concerted movements in the DsbA structure, which suggests that the modeled interdomain motions affect the catalytic cleft of the enzyme. Taken together, these data provide compelling evidence of a role for dynamics in the catalytic cycle of DsbA.
PubMed: 17585933
DOI: 10.1016/j.jmb.2007.05.067
PDB entries with the same primary citation
Experimental method
SOLUTION NMR
Structure validation

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