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Human ClpP (HClpP) partially substitutes bacterial ClpP (BClpP) in Bacillus subtilis, demonstrating conserved function across species. This research explores HClpP

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Area of Science:

  • Molecular biology
  • Microbiology
  • Proteolysis

Background:

  • ATP-dependent intracellular proteolysis is vital for all organisms.
  • ClpP proteases are essential, with conserved protein identity between bacteria and humans.
  • Bacterial ClpP (BClpP) and human ClpP (HClpP) share 56% sequence identity.

Purpose of the Study:

  • To investigate if human ClpP (HClpP) can functionally replace bacterial ClpP (BClpP) in Bacillus subtilis.
  • To assess the extent of functional substitution despite evolutionary divergence.

Main Methods:

  • Expressing human hclpP gene in B. subtilis at its native chromosomal locus.
  • Analyzing bacterial growth, sporulation, gene/protein expression under heat stress.
  • Performing co-immunoprecipitation and radioactive pulse-chase labeling experiments.

Main Results:

  • HClpP expression resulted in an intermediate phenotype between wild-type and clpP mutant strains.
  • HClpP showed similar heat-stress induction patterns to BClpP at mRNA and protein levels.
  • HClpP interacted with bacterial Clp chaperones and degraded the MgsR substrate, albeit slowly.
  • HClpP partially reversed the thickened cell wall phenotype observed in clpP mutants.

Conclusions:

  • Human ClpP (HClpP) offers partial functional substitution for bacterial ClpP (BClpP) in Bacillus subtilis.
  • HClpP retains conserved interactions with bacterial Clp chaperones and proteolysis activity.
  • The engineered B. subtilis strain expressing HClpP serves as a potential screening system for BClpP-targeting agents.