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- W1532942255 abstract "ClpP, the proteolytic component of the ATP-dependent ClpAP protease, is composed of 12 identical subunits and has intrinsic degradative activity against short peptides. Degradation of proteins and some peptides by ClpP requires the regulatory component ClpA and ATP. Peptide and protein substrates have been used to distinguish the roles of nucleotide binding and nucleotide hydrolysis in the activation of ClpAP protease. ATP binding alone promoted interaction between ClpA and ClpP, affected the substrate response curves for very short peptides, and activated degradation of larger peptides that were not degraded by ClpP alone. ATP hydrolysis did not increase in proportion to the increase in peptide bond hydrolysis of short peptides. However, ATP hydrolysis was strictly required for degradation of proteins such as alpha-casein; there was no indication of even limited cleavage of protein substrates when nonhydrolyzable analogs of ATP were used. Most large peptides and proteins were degraded in multiple sites without release of high molecular weight intermediates. Partial inactivation of ClpP with diisopropyl fluorophosphate produced ClpP with one to three active subunits/dodecamer. When only a few active sites were available in the active complex of ClpAP, degradation of large peptides and proteins released significant amounts of high molecular weight intermediates. Thus, processive degradation of protein substrates is a function of the multiple array of proteolytic active sites within the ClpP dodecamer." @default.
- W1532942255 created "2016-06-24" @default.
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- W1532942255 date "1994-07-01" @default.
- W1532942255 modified "2023-10-16" @default.
- W1532942255 title "Processive degradation of proteins by the ATP-dependent Clp protease from Escherichia coli. Requirement for the multiple array of active sites in ClpP but not ATP hydrolysis." @default.
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- W1532942255 doi "https://doi.org/10.1016/s0021-9258(17)32436-5" @default.
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