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dc.contributor.authorFurlong, EJ
dc.contributor.authorKurth, F
dc.contributor.authorPremkumar, L
dc.contributor.authorWhitten, AE
dc.contributor.authorMartin, JL
dc.date.accessioned2019-09-10T03:24:11Z
dc.date.available2019-09-10T03:24:11Z
dc.date.issued2019
dc.identifier.issn2059-7983
dc.identifier.doi10.1107/S2059798319000081
dc.identifier.urihttp://hdl.handle.net/10072/387168
dc.description.abstractSuppressor of copper sensitivity protein C from Proteus mirabilis (PmScsC) is a homotrimeric disulfide isomerase that plays a role in copper tolerance, which is a key virulence trait of this uropathogen. Each protomer of the enzyme has an N-terminal trimerization stem (59 residues) containing a flexible linker (11 residues) connected to a thioredoxin-fold-containing catalytic domain (163 residues). Here, two PmScsC variants, PmScsCΔN and PmScsCΔLinker, are characterized. PmScsCΔN is an N-terminally truncated form of the protomer with two helices of the trimerization stem removed, generating a protein with dithiol oxidase rather than disulfide isomerase activity. The crystal structure of PmScsCΔN reported here reveals, as expected, a monomer that is structurally similar to the catalytic domain of native PmScsC. The second variant, PmScsCΔLinker, was designed to remove the 11-amino-acid linker, and it is shown that it generates a protein that has neither disulfide isomerase nor dithiol oxidase activity. The crystal structure of PmScsCΔLinker reveals a trimeric arrangement, with the catalytic domains packed together very closely. Small-angle X-ray scattering analysis found that native PmScsC is predominantly trimeric in solution even at low concentrations, whereas PmScsCΔLinker exists as an equilibrium between monomeric, dimeric and trimeric states, with the monomeric form dominating at low concentrations. These findings increase the understanding of disulfide isomerase activity, showing how (i) oligomerization, (ii) the spacing between and (iii) the dynamic motion of catalytic domains in PmScsC all contribute to its native function.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherInternational Union of Crystallography (IUCr)
dc.relation.ispartofpagefrom296
dc.relation.ispartofpageto307
dc.relation.ispartofissue3
dc.relation.ispartofjournalActa Crystallographica Section D: Structural Biology
dc.relation.ispartofvolume75
dc.subject.fieldofresearchBacteriology
dc.subject.fieldofresearchProteomics and metabolomics
dc.subject.fieldofresearchStructural biology (incl. macromolecular modelling)
dc.subject.fieldofresearchcode310701
dc.subject.fieldofresearchcode310205
dc.subject.fieldofresearchcode310112
dc.subject.keywordsProteus mirabilis
dc.subject.keywordsScsC
dc.subject.keywordscopper tolerance
dc.subject.keywordsdisulfide isomerases
dc.subject.keywordssuppressor of copper sensitivity protein C
dc.titleEngineered variants provide new insight into the structural properties important for activity of the highly dynamic, trimeric protein disulfide isomerase ScsC from Proteus mirabilis
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationFurlong, EJ; Kurth, F; Premkumar, L; Whitten, AE; Martin, JL, Engineered variants provide new insight into the structural properties important for activity of the highly dynamic, trimeric protein disulfide isomerase ScsC from Proteus mirabilis, Acta Crystallographica Section D: Structural Biology, 2019, 75 (3), pp. 296-307
dcterms.dateAccepted2019-01-03
dcterms.licensehttp://creativecommons.org/licenses/by/4.0
dc.date.updated2019-09-10T03:17:50Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2019 International Union of Crystallography. This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
gro.hasfulltextFull Text
gro.griffith.authorMartin, Jennifer


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