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Genetic Control of L-a and L-(Bc) Dsrna Copy Number in Killer Systems of SACCHAROMYCES CEREVISIAE

Authors
  • Steven G. Ball
  • Catherine Tirtiaux
  • Reed B. Wickner
Publication Date
Jun 01, 1984
Source
PMC
Keywords
Disciplines
  • Biology
License
Unknown

Abstract

M dsRNA in yeast encodes a toxin precursor and immunity protein, whereas L-A dsRNA encodes the 81,000-dalton major protein of the intracellular particles in which both L-A and M are found. L-(BC) dsRNA(s) are found in particles with different coat proteins. We find that M dsRNA lowers the copy number of L-A, but not L-(BC). The SKI gene products lower the copy number of L-(BC), L-A, M1 and M2. This is the first known interaction of L-(BC) with any element of the killer systems. The MAK3, MAK10 and PET18 gene products are necessary for L-A maintenance and replication, but mutations in these genes do not affect L-(BC) copy number. Mutations in MAK1, MAK4, MAK7, MAK17 and MAK24 do not detectably affect copy number of L-(BC) or L-A.

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