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The N-end rule in bacteria.

J W Tobias1, T E Shrader, G Rocap

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Science (New York, N.Y.)
|November 29, 1991
PubMed
Summary
This summary is machine-generated.

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The N-end rule pathway, which links protein half-life to its N-terminal amino acid, exists in Escherichia coli. Specific N-terminal residues like arginine and lysine lead to rapid protein degradation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • The N-end rule describes a relationship between a protein's N-terminal amino acid and its in vivo half-life.
  • This rule has been observed in various eukaryotes, suggesting a conserved mechanism for protein stability regulation.

Purpose of the Study:

  • To investigate the presence and characteristics of the N-end rule pathway in the bacterium Escherichia coli.
  • To identify the specific N-terminal amino acids that influence protein stability in E. coli.

Main Methods:

  • Utilized a test protein to assess the impact of different N-terminal amino acids on its degradation rate in E. coli.
  • Investigated the role of leucine, phenylalanine-transfer RNA-protein transferase and the Clp protease in the N-end rule pathway.

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Main Results:

  • Escherichia coli possesses an N-end rule pathway, similar to eukaryotes.
  • N-terminal arginine, lysine, leucine, phenylalanine, tyrosine, and tryptophan resulted in a 2-minute half-life for the test protein.
  • Other N-terminal residues conferred half-lives exceeding 10 hours.
  • N-terminal arginine and lysine act as secondary destabilizing residues, requiring conjugation to primary destabilizing residues (leucine or phenylalanine) via leucine, phenylalanine-transfer RNA-protein transferase.
  • The adenosine triphosphate-dependent protease Clp (Ti) is essential for the degradation of N-end rule substrates in E. coli.

Conclusions:

  • The N-end rule pathway is conserved across prokaryotes and eukaryotes, demonstrating a fundamental mechanism for protein turnover.
  • Protein degradation in E. coli is significantly influenced by N-terminal amino acid identity, mediated by specific enzymes and proteases.