ACT3: a putative centractin homologue in S. cerevisiae is required for proper orientation of the mitotic spindle

doi:10.1083/jcb.127.1.129

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ACT3: a putative centractin homologue in S. cerevisiae is required for proper orientation of the mitotic spindle

SW Clark and DI Meyer
Department of Biological Chemistry, University of California, Los Angeles 90024.

As part of our ongoing efforts to understand the functional role of vertebrate centractins, we have identified a new member of the actin- related family of proteins in the yeast Saccharomyces cerevisiae using a PCR-based approach. Consistent with the current nomenclature for actin-related proteins in yeast, we propose to denote this locus ACT3. The primary amino acid sequence of Act3p is most similar to canine and human alpha-centractin (73% similarity/54% identity). The sequence of a genomic clone indicates ACT3 lies adjacent to and is transcribed convergently with respect to FUR1 on chromosome VIII. Molecular genetic analysis indicates ACT3 is represented by a single gene from which the corresponding mRNA is expressed at a low level compared to ACT1. Tetrad analysis of heterozygotes harboring a TRP1 replacement of the ACT3- coding region indicates ACT3 is nonessential for growth under normal conditions and at extremes of temperature and osmolarity. However, growth at 14 degrees C indicates a spindle orientation defect similar to phenotypes recently described for yeast harboring mutations in actin, tubulin, or cytoplasmic dynein. Taken together, our data suggest that ACT3 is the S. cerevisiae homologue of vertebrate centractins.
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