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- W1650763821 abstract "Caseinolytic protein, ClpC is a general stress protein which belongs to the heat shock protein HSP100 family of molecular chaperones. Some of the Clp group proteins have been identified as having a role in the pathogenesis of many bacteria. The Mycobacterium tuberculosis genome demonstrates the presence of a ClpC homolog, ClpC1. M. tuberculosis ClpC1 is an 848-amino acid protein, has two repeat sequences at its N-terminus and contains all the determinants to be classified as a member of the HSP100 family. In this study, we overexpressed, purified and functionally characterized M. tuberculosis ClpC1. Recombinant M. tuberculosis ClpC1 showed an inherent ATPase activity, and prevented protein aggregation. Furthermore, to investigate the contribution made by the N-terminal repeats of ClpC1 to its functional activity, two deletion variants, ClpC1Δ1 and ClpC1Δ2, lacking N-terminal repeat I and N-terminal repeat I along with the linker between N-terminal repeats I and II, respectively were generated. Neither deletion affected the ATPase activity. However, ClpC1Δ1 was structurally altered, less stable and was unable to prevent protein aggregation. Compared with wild-type protein, ClpC1Δ2 was more active in preventing protein aggregation and displayed higher ATPase activity at high pH values and temperatures. The study demonstrates that M. tuberculosis ClpC1 manifests chaperone activity in the absence of any adaptor protein and only one of the two N-terminal repeats is sufficient for the chaperone activity. Also, an exposed repeat II makes the protein more stable and functionally more active." @default.
- W1650763821 created "2016-06-24" @default.
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- W1650763821 date "2008-11-04" @default.
- W1650763821 modified "2023-10-07" @default.
- W1650763821 title "Mycobacterium tuberculosis ClpC1" @default.
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- W1650763821 doi "https://doi.org/10.1111/j.1742-4658.2008.06738.x" @default.
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