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Related Experiment Video

Updated: Jun 7, 2025

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe
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Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

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The Yeast Ribosomal Protein Rpl1b Is Not Required for Respiration.

Bruce Futcher1

  • 1Department of Microbiology and Immunology, Stony Brook University, Stony Brook, NY 11794, USA.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary

Ribosomal protein paralogs can have opposite effects on respiration. Previously reported petite phenotypes for specific ribosomal protein mutants were found to be incorrect; these mutants are actually respiration-competent.

Keywords:
Rpl1bpetiterespirationribosomal paralogsribosomal proteins

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Area of Science:

  • Molecular Biology
  • Yeast Genetics

Background:

  • Ribosomal proteins are essential for protein synthesis.
  • Paralogs of ribosomal proteins can exhibit distinct functions.
  • Previous studies reported respiration-deficient (petite) phenotypes for specific ribosomal protein mutants.

Purpose of the Study:

  • To re-examine the respiratory phenotypes of specific ribosomal protein mutants.
  • To investigate the discrepancy in reported phenotypes for ribosomal protein paralogs.

Main Methods:

  • Deletion mutagenesis in yeast.
  • Assessment of respiratory competence in mutant strains.

Main Results:

  • Mutants in ribosomal protein genes rpl1b, rpl2b, rps11a, and rps26b were found to be respiration-competent (grande).
  • This contradicts previous findings by Segev and Gerst, who reported petite phenotypes for these mutants.
  • Paralogs with identical or near-identical amino acid sequences exhibited opposite respiratory phenotypes.

Conclusions:

  • The previously reported petite phenotypes for rpl1b, rpl2b, rps11a, and rps26b mutants are inaccurate.
  • Ribosomal protein paralogs can have non-redundant and opposing roles in cellular respiration.
  • Further investigation is needed to understand the mechanisms underlying these divergent phenotypes.