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Molecular basis for bacterial class I release factor methylation by PrmC

Marc Graille1, Valérie Heurgué-Hamard, Stéphanie Champ

  • 1Institut de Biochimie et Biophysique Moléculaire et Cellulaire, CNRS, UMR8619, Université Paris-Sud, Orsay, France.

Molecular Cell
|December 21, 2005
PubMed

Insights

Methylation of release factor 1 (RF1) by PrmC significantly enhances protein synthesis termination. The crystal structure reveals how RF1 and PrmC interact, showing a compact RF1 conformation.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Class I release factors (RFs) are essential for protein synthesis termination.
  • RFs bind to stop codons on ribosomes and hydrolyze peptidyl-tRNA.
  • A conserved GGQ motif in RFs interacts with the ribosomal peptidyl transferase center.

Purpose of the Study:

  • To elucidate the structural basis of PrmC-mediated methylation of E. coli RF1.
  • To understand how methylation stimulates peptide chain release.

Main Methods:

  • X-ray crystallography was used to determine the structure of the E. coli RF1-PrmC-AdoHCy complex.
  • Site-directed mutagenesis was employed to investigate functional roles of RF1 domains.

Main Results:

  • The crystal structure reveals interactions between RF1 domains 2, 3, and 4 and PrmC.
  • RF1 adopts a compact conformation in the complex, distinct from its ribosomal-bound state.
  • Methylation by PrmC strongly stimulates peptide chain release.

Conclusions:

  • Structural data provides insights into the mechanism of RF1 activation by PrmC.
  • The findings highlight the importance of post-translational modification in regulating protein synthesis termination.

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