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HspQ Functions as a Unique Specificity-Enhancing Factor for the AAA+ Lon Protease.

Neha Puri1, A Wali Karzai1

  • 1Department of Biochemistry and Cell Biology, Center for Infectious Diseases, Graduate Program in Molecular and Cellular Biology, Stony Brook University, Stony Brook, NY 11794, USA.

Molecular Cell
|June 3, 2017
PubMed
Summary

The AAA+ Lon protease, crucial for protein homeostasis, degrades substrates like HspQ. HspQ acts as an activator, enhancing Lon protease

Keywords:
AAA+HspQLonadaptorchaperoneguided proteolysisheat shockproteaseprotein degradationproteolysis

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Area of Science:

  • Molecular Biology
  • Protease Function
  • Protein Homeostasis

Background:

  • AAA+ Lon protease is vital for protein homeostasis across species.
  • Lon protease plays roles in bacterial pathogenesis and human diseases.
  • Understanding Lon's substrate selectivity is key to its biological functions.

Purpose of the Study:

  • To elucidate the mechanism of substrate recognition and degradation by Lon protease.
  • To identify novel substrates and regulators of Lon protease activity.
  • To investigate the role of HspQ in Lon protease function.

Main Methods:

  • Biochemical assays to study protein-protein interactions.
  • Substrate degradation assays.
  • Structural analysis of Lon-HspQ complex.

Main Results:

  • HspQ identified as a novel Lon protease substrate and allosteric activator.
  • Lon protease recognizes HspQ via a C-terminal degron and its native structure.
  • HspQ binding allosterically activates Lon protease, enhancing degradation of multiple substrates.
  • Two distinct substrate recognition sites on Lon protease identified: one for direct binding and one allosteric site modulated by HspQ.

Conclusions:

  • HspQ represents a unique specificity-enhancing factor for Lon protease.
  • Lon protease utilizes a novel regulatory mechanism involving an allosteric site activated by HspQ.
  • This mechanism allows for temporally enhanced substrate selectivity by Lon protease, impacting protein homeostasis.