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Current Genetics

, Volume 11, Issue 6–7, pp 483–490 | Cite as

Gene-protein assignments within the yeast Yarrowia lipolytica dsRNA viral genome

  • M. El-Sherbeini
  • K. A. Bostia
  • J. Levitr
  • Diane J. Mitchel
Original Articles
Received:

Summary

Some strains of the yeast Yarrowia lipolytica possess virus-like particles (VLPs) which encapsidate a double-stranded RNA (dsRNA) genome designated Ly. We report here that these VLPs have two associated polypeptides of molecular weights 83 kd (VLy-P1) and 77 kd (VLy-P2). Denatured Ly-dsRNA was used to program a cell-free rabbit reticulocyte translation system, resulting in the appearance of four major products, viz. Ly-P1 (83 kd); Ly-P2 (77 kd); Ly-P3 (74 kd) and Ly-P4 (68 kd). The in vivo viral-associated protein VLy-P1 co-migrated on SDS-polyacrylamide gels with the in vitro product Ly-P1 and, similarly, VLy-P2 co-migrated with Ly-P2. Peptide mapping data confirm the identity of the in vivo products (VLy-P1 and VLy-P2) and their in vitro counterparts. The conclusion made is that VLy-P1 and VLyP2 are almost identical primary translation products of the Ly genome, derived from a single or multiple species of Ly-dsRNA. RNA blot hybridizations using L1A M1 and separately, L2A M2 probes prepared from appropriate K1 and K2 Saccharomyces cerevisiae killer strains, failed to show any detectable homology to Ly-dsRNA, substantiating the uniqueness of the Ly genome with respect to the K1 and K2 S. cerevisiae dsRNA killer systems.

Key words

Double-stranded RNA (dsRNA) Yarrowia lipolytica Saccharomyces cerevisiae Virus-like particles 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • M. El-Sherbeini
    • 1
  • K. A. Bostia
    • 1
  • J. Levitr
    • 1
  • Diane J. Mitchel
    • 2
  1. 1.Section of Biochemistry, Division of Biology and MedicineBrown UniversityProvidenceUSA
  2. 2.School of Biological SciencesQueen Mary CollegeLondonUK

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