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Revealing biophysical properties of KfrA-type proteins as a novel class of cytoskeletal, coiled-coil plasmid-encoded proteins

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dc.abstract.enAbstractBackgroundDNA binding KfrA-type proteins of broad-host-range bacterial plasmids belonging to IncP-1 and IncU incompatibility groups are characterized by globular N-terminal head domains and long alpha-helical coiled-coil tails. They have been shown to act as transcriptional auto-regulators.ResultsThis study was focused on two members of the growing family of KfrA-type proteins encoded by the broad-host-range plasmids, R751 of IncP-1β and RA3 of IncU groups. Comparative in vitro and in silico studies on KfrAR751and KfrARA3confirmed their similar biophysical properties despite low conservation of the amino acid sequences. They form a wide range of oligomeric forms in vitro and, in the presence of their cognate DNA binding sites, they polymerize into the higher order filaments visualized as “threads” by negative staining electron microscopy. The studies revealed also temperature-dependent changes in the coiled-coil segment of KfrA proteins that is involved in the stabilization of dimers required for DNA interactions.ConclusionKfrAR751and KfrARA3are structural homologues. We postulate that KfrA type proteins have moonlighting activity. They not only act as transcriptional auto-regulators but form cytoskeletal structures, which might facilitate plasmid DNA delivery and positioning in the cells before cell division, involving thermal energy.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorAdamczyk, Małgorzata
dc.contributor.authorLewicka, Ewa
dc.contributor.authorSzatkowska, Róża
dc.contributor.authorNIEZNAŃSKA, HANNA
dc.contributor.authorLudwiczak, Jan
dc.contributor.authorJagura-Burdzy, Grażyna
dc.contributor.authorGoch, Grażyna
dc.contributor.authorŚwiderska, Bianka
dc.contributor.authorSitkiewicz, Ewa
dc.contributor.authorDunin-Horkawicz, Stanisław
dc.contributor.authorJasiński, Maciej
dc.date.accessioned2024-01-25T19:25:21Z
dc.date.available2024-01-25T19:25:21Z
dc.date.issued2021
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.volume21
dc.identifier.doi10.1186/S12866-020-02079-W
dc.identifier.issn1471-2180
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/118538
dc.identifier.weblinkhttps://bmcmicrobiol.biomedcentral.com/articles/10.1186/s12866-020-02079-w
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofBMC Microbiology
dc.relation.pages1-16
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleRevealing biophysical properties of KfrA-type proteins as a novel class of cytoskeletal, coiled-coil plasmid-encoded proteins
dc.typeJournalArticle
dspace.entity.typePublication