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GENETIC CONTROL OF L-A AND L-(BC) dsRNA COPY NUMBER IN KILLER SYSTEMS OF SACCHAROMYCES CEREVISIAE
Steven G. Ball 1, Catherine Tirtiaux 1, and Reed B. Wickner 2
1 Section on Genetics of Simple Eukaryotes, Laboratory of Biochemical
Pharmacology, National Institute of Arthritis, Diabetes, and Digestive and
Kidney Diseases, National Institutes of Health, Building 4, Room 116, Bethesda,
Maryland 20205; and Chaire de Génétique Faculté des Sciences
Agronomiques de l'Etate à Gembloux, 5800 Gembloux, Belgium
2 Section on Genetics of Simple Eukaryotes, Laboratory of Biochemical
Pharmacology, National Institute of Arthritis, Diabetes, and Digestive and
Kidney Diseases, National Institutes of Health, Building 4, Room 116, Bethesda,
Maryland 20205
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.
Submitted on September 27, 1983Accepted on February 27, 1984
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