Document Detail

Two chromosomal genes required for killing expression in killer strains of Saccharomyces cerevisiae.
MedLine Citation:
PMID:  773743     Owner:  NLM     Status:  MEDLINE    
The killer character of yeast is determined by a 1.4 X 10(6) molecular weight double-stranded RNA plasmid and at least 12 chromosomal genes. Wild-type strains of yeast that carry this plasmid (killers) secret a toxin which is lethal only to strains not carrying this plasmid (sensitives).--We have isolated 28 independent recessive chromosomal mutants of a killer strain that have lost the ability to secrete an active toxin but remain resistant to the effects of the toxin and continue to carry the complete cytoplasmic killer genome. These mutants define two complementation groups, kex1 and kex2. Kex1 is located on chromosome VII between ade5 and lys5. Kex2 is located on chromosome XIV, but it does not show meiotic linkage to any gene previously located on this chromosome.--When the killer plasmid of kex1 or kex2 strains is eliminated by curing with heat or cycloheximide, the strains become sensitive to killing. The mutant phenotype reappears among the meiotic segregants in a cross with a normal killer. Thus, the kex phenotype does not require an alteration of the killer plasmid.--Kex1 and kex2 strains each contain near-normal levels of the 1.4 x 10(6) molecular weight double-stranded RNA, whose presence is correlated with the presence of the killer genome.
R B Wickner; M J Leibowitz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Genetics     Volume:  82     ISSN:  0016-6731     ISO Abbreviation:  Genetics     Publication Date:  1976 Mar 
Date Detail:
Created Date:  1976-08-02     Completed Date:  1976-08-02     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  429-42     Citation Subset:  IM    
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MeSH Terms
Chromosome Mapping
Cycloheximide / pharmacology
Mycotoxins / biosynthesis*
Plasmids / drug effects
Saccharomyces cerevisiae / metabolism*
Species Specificity
Reg. No./Substance:
0/Mycotoxins; 66-81-9/Cycloheximide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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