Virus-like particle capsid proteins encoded by different L double-stranded RNAs of Saccharomyces cerevisiae: their roles in maintenance of M double-stranded killer plasmids

UMMS Affiliation

Department of Molecular Genetics and Microbiology; Department of Microbiology and Physiological Systems

Publication Date


Document Type



Microbiology | Molecular Biology | Physiology


The plasmid determinants of killer phenotypes in type K1 and K2 killer yeast cells are the 1.9-kilobase (kb) M1 and 1.7-kb M2 double-stranded RNAs (dsRNAs), respectively. These are dependent for their maintenance and encapsidation, in Saccharomyces cerevisiae virus ScV-M1 or ScV-M2 virus-like particles, on the capsid provided by one of a group of moderately related 4.7-kb dsRNAs called LA. The L1A and L2A dsRNAs found in naturally isolated K1 and K2 killers encode 88-kilodalton VL1A-P1 and 86-kilodalton VL2A-P1 capsids, respectively. These are competent for encapsidating homologous LA dsRNAs as well as M dsRNAs. Most strains of S. cerevisiae, including killers, contain one of a second group of closely related 4.7-kb dsRNAs called LBC. These encode their own 82-kilodalton capsid protein, VLBC-P1, which, at least in strains containing only LBC, encapsidates homologous dsRNA in ScV-LBC virus-like particles. In a K1 killer strain containing both L1A and LBC, ScV-M1 particles contain only VL1A-P1. In such strains it is probable that each virus-like particle contains a single capsid type and that each L dsRNA is encapsidated by a homologous capsid.

DOI of Published Version



Mol Cell Biol. 1984 Dec;4(12):2818-27. doi: 10.1128/mcb.4.12.2818. Link to article on publisher's site

Journal/Book/Conference Title

Molecular and cellular biology

Related Resources

Link to Article in PubMed

PubMed ID