Molecular Genetics and Genomics

, Volume 270, Issue 3, pp 216–224

Mak5p, which is required for the maintenance of the M1 dsRNA virus, is encoded by the yeast ORF YBR142w and is involved in the biogenesis of the 60S subunit of the ribosome

  • M. Zagulski
  • D. Kressler
  • A.-M. Bécam
  • J. Rytka
  • C. J. Herbert
Original Paper


In this study, we show that the Saccharomyces cerevisiae ORF YBR142w, which encodes a putative DEAD-box RNA helicase, corresponds to MAK5. The mak5-1 allele is deficient in the maintenance of the M1 dsRNA virus, resulting in a killer minus phenotype. This allele carries two mutations, G218D in the conserved ATPase A-motif and P618S in a non-conserved region. We have separated these mutations and shown that it is the G218D mutation that is responsible for the killer minus phenotype. Mak5p is an essential nucleolar protein; depletion of the protein leads to a reduction in the level of 60S ribosomal subunits, the appearance of half-mer polysomes, and a delay in production of the mature 25S and 5.8S rRNAs. Thus, Mak5p is involved in the biogenesis of 60S ribosomal subunits.


Saccharomyces cerevisiae  MAK5 DEAD-box helicase Ribosome biogenesis M1 dsRNA virus 


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • M. Zagulski
    • 1
  • D. Kressler
    • 2
  • A.-M. Bécam
    • 3
  • J. Rytka
    • 1
  • C. J. Herbert
    • 3
  1. 1.Institute of Biochemistry and BiophysicsPolish National Academy of SciencesWarsawPoland
  2. 2.Département de Biochimie Médicale, Centre Médical UniversitaireUniversité de GenèveGenève 4Switzerland
  3. 3.Laboratoire propre du CNRS associé à l'Université Pierre et Marie CurieCentre de Génétique MoléculaireGif-sur-YvetteFrance

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