Regulation of heat and radiation stress responses in yeast by hsp-104.

We have investigated the role of heat-shock protein 104 (hsp-104) in the induction of ionizing radiation resistance in yeast. Yeast defective in the production of hsp-104 are constitutively sensitive to killing by heat and are known to be compromised for the induction of thermotolerance. We confirmed that hsp104 yeast mutants are altered in their ability to become thermotolerant by a heat stress. However, we found that the mutant strain did …