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Machines of protein destruction-including energy-dependent proteases and disassembly chaperones of the AAA(+) ATPase family-function in all kingdoms of life to sculpt the cellular proteome, ensuring that unnecessary and dangerous proteins are eliminated and biological responses to environmental change are rapidly and properly regulated. Exciting progress(More)
ClpXP, a bacterial AAA+ protease, controls intracellular levels of many stress-response proteins. To investigate substrate profile changes caused by a specific environmental stress, quantitative mass spectrometry (SILAC) was used to analyze proteins trapped by ClpXP(trap) before and after DNA damage. The abundance of half of the trapped proteins changed(More)
Clp/Hsp100 ATPases remodel and disassemble multiprotein complexes, yet little is known about how they preferentially recognize these complexes rather than their constituent subunits. We explore how substrate multimerization modulates recognition by the ClpX unfoldase using a natural substrate, MuA transposase. MuA is initially monomeric but forms a stable(More)
The N-end rule is a degradation pathway conserved from bacteria to mammals that links a protein's stability in vivo to the identity of its N-terminal residue. In Escherichia coli, the components of this pathway directly responsible for protein degradation are the ClpAP protease and its adaptor ClpS. We recently demonstrated that ClpAP is able to recognize(More)
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