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Genetics, Vol 135, 265-274, Copyright © 1993
INVESTIGATIONS |
Screens for Extragenic Mutations That Fail to Complement act1 Alleles Identify Genes That Are Important for Actin Function in Saccharomyces cerevisiae
M. D. Welch, DBN. Vinh, H. H. Okamura and D. G. Drubin
Department of Molecular and Cell Biology, University of California, Berkeley, California 94720
Null mutations in SAC6 and ABP1, genes that encode actin-binding proteins, failed to complement the temperature-sensitive phenotype caused by a mutation in the ACT1 gene. To identify novel genes whose protein products interact with actin, mutations that fail to complement act1-1 or act1-4, two temperature-sensitive alleles of ACT1, were isolated. A total of 14 extragenic noncomplementing mutations and 12 new alleles of ACT1 were identified in two independent screens. The 14 extragenic noncomplementing mutations represent alleles of at least four different genes, ANC1, ANC2, ANC3 and ANC4 (Actin NonComplementing). Mutations in the ANC1 gene were shown to cause osmosensitivity and defects in actin organization; phenotypes that are similar to those caused by act1 mutations. We conclude that the ANC1 gene product plays an important role in actin cytoskeletal function. The 12 new alleles of ACT1 will be useful for further elucidation of the functions of actin in yeast.
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