Aggregate-reactivation activity of the molecular chaperone ClpB from Ehrlichia chaffeensis

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dc.contributor.author Zhang, Ting
dc.contributor.author Kedzierska-Mieszkowska, Sabina
dc.contributor.author Liu, Huitao
dc.contributor.author Cheng, Chuanmin
dc.contributor.author Ganta, Roman R.
dc.contributor.author Zolkiewski, Michal
dc.date.accessioned 2013-05-31T21:48:51Z
dc.date.available 2013-05-31T21:48:51Z
dc.date.issued 2013-05-07
dc.identifier.uri http://hdl.handle.net/2097/15875
dc.description Citation: Zhang T, Kedzierska-Mieszkowska S, Liu H, Cheng C, Ganta RR, Zolkiewski M (2013) Aggregate-Reactivation Activity of the Molecular Chaperone ClpB from Ehrlichia chaffeensis. PLoS ONE 8(5): e62454. https://doi.org/10.1371/journal.pone.0062454
dc.description.abstract Rickettsiale diseases, including human monocytic ehrlichiosis caused by Ehrlichia chaffeensis, are the second leading cause of the tick-borne infections in the USA and a growing health concern. Little is known about how E. chaffeensis survives the host-induced stress in vertebrate and tick hosts. A molecular chaperone ClpB from several microorganisms has been reported to reactivate aggregated proteins in cooperation with the co-chaperones DnaK/DnaJ/GrpE (KJE). In this study, we performed the first biochemical characterization of ClpB from E. chaffeensis. The transcript of E. chaffeensis ClpB (EhClpB) is strongly upregulated after infection of cultured macrophages and its level remains high during the Ehrlichia replicative stage. EhClpB forms ATP-dependent oligomers and catalyzes the ATP hydrolysis, similar to E. coli ClpB (EcClpB), but its ATPase activity is insensitive to the EcClpB activators, casein and poly-lysine. EhClpB in the presence of E. coli KJE efficiently reactivates the aggregated glucose-6-phosphate dehydrogenase (G6PDH) and firefly luciferase. Unlike EcClpB, which requires the co-chaperones for aggregate reactivation, EhClpB reactivates G6PDH even in the absence of KJE. Moreover, EhClpB is functionally distinct from EcClpB as evidenced by its failure to rescue a temperature-sensitive phenotype of the clpB-null E. coli. The clpB expression pattern during the E. chaffeensis infection progression correlates with the pathogen’s replicating stage inside host cells and suggests an essential role of the disaggregase activity of ClpB in the pathogen’s response to the host-induced stress. This study sets the stage for assessing the importance of the chaperone activity of ClpB for E. chaffeensis growth within the mammalian and tick hosts. en_US
dc.language.iso en_US en_US
dc.relation.uri http://doi.org/10.1371/journal.pone.0062454 en_US
dc.rights Attribution 3.0 United States (CC BY 3.0 US)
dc.rights.uri https://creativecommons.org/licenses/by/3.0/us/
dc.subject Rickettsiale diseases en_US
dc.subject Ehrlichia chaffeensis en_US
dc.subject Tick-borne infections en_US
dc.subject ClpB en_US
dc.title Aggregate-reactivation activity of the molecular chaperone ClpB from Ehrlichia chaffeensis en_US
dc.type Article (publisher version) en_US
dc.date.published 2013 en_US
dc.citation.doi 10.1371/journal.pone.0062454 en_US
dc.citation.issue 5 en_US
dc.citation.jtitle PLoS ONE en_US
dc.citation.spage e62454 en_US
dc.citation.volume 8 en_US
dc.citation Zhang T, Kedzierska-Mieszkowska S, Liu H, Cheng C, Ganta RR, Zolkiewski M (2013) Aggregate-Reactivation Activity of the Molecular Chaperone ClpB from Ehrlichia chaffeensis. PLoS ONE 8(5): e62454. https://doi.org/10.1371/journal.pone.0062454
dc.contributor.authoreid michalz en_US


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