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• W2019460611 abstract "Small heat shock proteins (sHSPs) represent an abundant and ubiquitous family of molecular chaperones that are believed to prevent irreversible aggregation of other cellular proteins under stress conditions. One of the most prominent features of sHSPs is that they exist as homo-oligomers. Examples of both monodisperse and polydisperse oligomers are found within this family. The small heat shock inclusion-body binding protein B (IbpB) of Escherichia coli, originally discovered as a component of inclusion bodies, exhibits a pronounced polydispersity in its oligomeric state. This research was performed to elucidate the temperature effect on the oligomeric state and chaperone-like activity of the polydisperse IbpB oligomers, as well as the structural basis for such a temperature effect. The data presented here demonstrate that the large oligomers of IbpB progressively dissociate into smaller ones at increasing heat-shock temperatures, accompanied by a notable enhancement of chaperone-like activities. The secondary structure, enriched mainly by beta-strands, is slightly changed with such temperature increases. The dimeric building blocks, which seem to be highly stable, act as the functional unit of IbpB. Limited proteolysis was used to identify the susceptible sites in IbpB that may compose the subunit interfaces, which indicated that the 11 residues at both the N and the C terminus are highly flexible and the removal of each will lead to the formation of dimers, as well as the disappearance of chaperone-like activities. Truncation of 11 residues from either end, using recombinant DNA technology, also led to the formation of dimeric mutant IbpB proteins lacking chaperone-like activities. Taken together, the flexible termini appear to be essential for small heat shock protein IbpB to generate various temperature-responsive oligomers, which exhibit various levels of chaperone-like activities, by interlinking or separating the dimer building blocks." @default.
• W2019460611 created "2016-06-24" @default.
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• W2019460611 date "2005-04-01" @default.
• W2019460611 modified "2023-10-10" @default.
• W2019460611 title "The Essential Role of the Flexible Termini in the Temperature-responsiveness of the Oligomeric State and Chaperone-like Activity for the Polydisperse Small Heat Shock Protein IbpB from Escherichia coli" @default.
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• W2019460611 doi "https://doi.org/10.1016/j.jmb.2005.01.029" @default.
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