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N-Degron Pathways in Plastids.

Imen Bouchnak1, Klaas J van Wijk1

  • 1Section of Plant Biology, School of Integrative Plant Sciences (SIPS), Cornell University, Ithaca, NY 14850, USA.

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|July 14, 2019
PubMed
Summary

This study proposes N-degron pathways in plastids, similar to prokaryotic systems, regulating protein stability. Evidence suggests specific protein N-termini and caseinolytic protease (CLP) systems are involved in plastid protein degradation.

Keywords:
CLPSN-degron pathwayN-end rulechloroplastprotein stabilityproteostasis

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein amino (N)-termini dictate protein stability via N-degron pathways in prokaryotes and eukaryotes.
  • These pathways involve recognition of specific N-terminal residues and subsequent degradation by chaperone-protease systems.

Purpose of the Study:

  • To propose the existence of N-degron pathways within plastids of apicomplexa, algae, and plants.
  • To investigate the role of caseinolytic protease (CLP) systems and N-terminal residues in plastid protein stability.

Main Methods:

  • Analysis of chloroplast N-terminome data.
  • Comparison of plastid CLP systems with prokaryotic homologs.
  • Review of existing literature on protein degradation pathways.

Main Results:

  • Plastids possess diversified CLP systems, including CLPS homologs, interacting with N-terminal residues and stromal proteins.
  • Chloroplast N-terminome data reveal enrichment of stabilizing residues (Ala, Ser, Val, Thr) and avoidance of destabilizing residues.
  • Evidence supports the hypothesis of N-degron pathways operating in plastids.

Conclusions:

  • N-degron pathways likely exist and function in plastids, analogous to prokaryotic systems.
  • These pathways are crucial for regulating protein stability within plastids.
  • Experimental strategies are proposed to further validate plastid N-degron pathways.