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. 1989 Sep;9(9):3638–3646. doi: 10.1128/mcb.9.9.3638

Isolation and characterization of STI1, a stress-inducible gene from Saccharomyces cerevisiae.

C M Nicolet 1, E A Craig 1
PMCID: PMC362424  PMID: 2674681

Abstract

We have isolated a gene from the yeast Saccharomyces cerevisiae that encodes a 2.0-kilobase heat-inducible mRNA. This gene, which we have designated STI1, for stress inducible, was also induced by the amino acid analog canavanine and showed a slight increase in expression as cells moved into stationary phase. The STI1 gene encodes a 66-kilodalton protein, as determined from the sequence of the longest open reading frame. The putative STI1 protein, as identified by two-dimensional gel electrophoresis, migrated in the region of 73 to 75 kilodaltons as a series of four isoforms with different isoelectric points. STI1 is not homologous to the other conserved HSP70 family members in yeasts, despite similarities in size and regulation. Cells carrying a disruption mutation of the STI1 gene grew normally at 30 degrees C but showed impaired growth at higher and lower temperatures. Overexpression of the STI1 gene resulted in substantial trans-activation of SSA4 promoter-reporter gene fusions, indicating that STI1 may play a role in mediating the heat shock response of some HSP70 genes.

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