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Critical clamp loader processing by an essential AAA+ protease in Caulobacter crescentus.

Robert H Vass1, Peter Chien

  • 1Molecular and Cellular Biology Graduate Program, Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003.

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|October 23, 2013
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Summary

In Caulobacter crescentus, the casein lytic proteinase (Clp) XP protease generates essential long and short DnaX forms via partial proteolysis. Both DnaX isoforms are crucial for cell viability and responding to DNA damage.

Keywords:
ClpPClpX internal recognitionprotease stalling

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Area of Science:

  • Molecular biology
  • Microbiology
  • Biochemistry

Background:

  • Chromosome replication requires sliding clamps loaded by energy-dependent complexes.
  • In E. coli, DnaX clamp loader subunit exists as long (τ) and short (γ) forms, but their necessity is unclear.
  • The mechanism for generating these isoforms varies across bacterial species.

Purpose of the Study:

  • To investigate the mechanism of DnaX isoform generation in Caulobacter crescentus.
  • To determine the functional significance of DnaX isoforms in C. crescentus.
  • To explore the role of clamp loader diversity in DNA damage response.

Main Methods:

  • Analysis of DnaX processing by the ClpXP protease in C. crescentus.
  • Genetic manipulation to alter the glycine-rich region of DnaX.
  • Assessment of cell viability and DNA damage sensitivity in engineered strains.

Main Results:

  • DnaX isoforms are generated through partial proteolysis by ClpXP, not translational frameshifting.
  • A glycine-rich region adjacent to a structured domain mediates ClpXP-dependent partial degradation.
  • A τ-only DnaX form is non-viable, but viability is restored with co-expressed γ.
  • Strains lacking proteolytically generated γ are more sensitive to DNA damage.

Conclusions:

  • ClpXP protease employs an unexpected partial processing mechanism to generate DnaX isoforms.
  • Both τ and γ DnaX forms are essential for Caulobacter viability.
  • Clamp loader diversity contributes to DNA damage response.
  • Conserved need for distinct DnaX isoforms suggests a conserved role in DNA damage response across bacteria.