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MSl3, a multicopy suppressor of mutants hyperactivated in the RAS-CAMP pathway, encodes a novel HSP70 protein of Saccharomyces cerevisiae

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The MSI3 gene was isolated as a multicopy suppressor of the heat shock-sensitive phenotype of the iral mutation, which causes hyperactivation of the RAS-cAMP pathway. Overexpression of MSI3 also suppresses the heat shock-sensitive phenotype of the bcyl mutant. Determination of the DNA sequence of MSI3 revealed that MSI3 can encode a 77.4 kDa protein related to the HSP70 family. The amino acid sequence of Msi3p is about 30% identical to that of the Ssalp of Saccharomyces cerevisiae. This contrasts with the finding that members of the HSP70 family generally show at least 50% amino acid identity. The consensus nucleotide sequence of the heat shock element (HSE) was found in the upstream region of MSI3. Moreover, the steady-state levels of the MSI3 mRNA and protein were increased upon heat shock. These results indicate that the MSI3 gene encodes a novel HSP70-like heat shock protein. Disruption of the MSI3 gene was associated with a temperature sensitive growth phenotype but unexpectedly, thermotolerance was enhanced in the disruptant.

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Correspondence to Akio Toh-e.

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Communicated by K. Isono

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Shirayama, M., Kawakami, K., Matsui, Y. et al. MSl3, a multicopy suppressor of mutants hyperactivated in the RAS-CAMP pathway, encodes a novel HSP70 protein of Saccharomyces cerevisiae . Molec. Gen. Genet. 240, 323–332 (1993). https://doi.org/10.1007/BF00280382

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Key words

  • Heat shock response
  • HSP70
  • Saccharomyces cerevisiae
  • RAS-CAMP pathway
  • Multicopy suppressor of ira1