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dc.contributor.authorHu, SH
dc.contributor.authorPeek, JA
dc.contributor.authorRattigan, E
dc.contributor.authorTaylor, RK
dc.contributor.authorMartin, JL
dc.date.accessioned2017-10-05T02:54:47Z
dc.date.available2017-10-05T02:54:47Z
dc.date.issued1997
dc.identifier.issn0022-2836
dc.identifier.doi10.1006/jmbi.1997.0940
dc.identifier.urihttp://hdl.handle.net/10072/347906
dc.description.abstractThe efficient and correct folding of bacterial disulfide bonded proteins in vivo is dependent upon a class of periplasmic oxidoreductase proteins called DsbA, after the Escherichia coli enzyme. In the pathogenic bacterium Vibrio cholerae, the DsbA homolog (TcpG) is responsible for the folding, maturation and secretion of virulence factors. Mutants in which the tcpg gene has been inactivated are avirulent; they no longer produce functional colonisation pili and they no longer secrete cholera toxin. TcpG is thus a suitable target for inhibitors that could counteract the virulence of this organism, thereby preventing the symptoms of cholera. The crystal structure of oxidized TcpG (refined at a resolution of 2.1 Å) serves as a starting point for the rational design of such inhibitors. As expected, TcpG has the same fold as E. coli DsbA, with which it shares ∼40% sequence identity. In addition, the characteristic surface features of DsbA are present in TcpG, supporting the notion that these features play a functional role. While the overall architecture of TcpG and DsbA is similar and the surface features are retained in TcpG, there are significant differences. For example, the kinked active site helix results from a three-residue loop in DsbA, but is caused by a proline in TcpG (making TcpG more similar to thioredoxin in this respect). Furthermore, the proposed peptide binding groove of TcpG is substantially shortened compared with that of DsbA due to a six-residue deletion. Also, the hydrophobic pocket of TcpG is more shallow and the acidic patch is much less extensive than that of E. coli DsbA. The identification of the structural and surface features that are retained or are divergent in TcpG provides a useful assessment of their functional importance in these protein folding catalysts and is an important prerequisite for the design of TcpG inhibitors.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofpagefrom137
dc.relation.ispartofpageto146
dc.relation.ispartofissue1
dc.relation.ispartofjournalJournal of Molecular Biology
dc.relation.ispartofvolume268
dc.subject.fieldofresearchMedicinal and biomolecular chemistry
dc.subject.fieldofresearchBiochemistry and cell biology
dc.subject.fieldofresearchBiochemistry and cell biology not elsewhere classified
dc.subject.fieldofresearchMicrobiology
dc.subject.fieldofresearchcode3404
dc.subject.fieldofresearchcode3101
dc.subject.fieldofresearchcode310199
dc.subject.fieldofresearchcode3107
dc.titleStructure of TcpG, the DsbA protein folding catalyst from Vibrio cholerae
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorMartin, Jennifer


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