Hyun-Soo Kim1. 1. Department of Food Science and Technology, Jungwon University, 85, Munmu-ro, Goesan-eup, Goesan-gun, Chungbuk, 367-805, Republic of Korea. hyun1006@jwu.ac.kr.
Abstract
OBJECTIVE: This study aimed to identify genes related to freeze-thaw tolerance and elucidate the tolerance mechanism in yeast Saccharomyces cerevisiae as an appropriate eukaryote model. RESULTS: In this study, one tolerant strain exposed to freeze-thaw stress was isolated by screening a transposon-mediated mutant library and the disrupted gene was identified to be YCP4. In addition, this phenotype related to freeze-thaw tolerance was confirmed by deletion and overexpressing of this corresponding gene. This mutant strain showed a freeze-thaw tolerance by reducing the intracellular level of reactive oxygen species and the activation of the MSN2/4 and STRE-mediated genes such as CTT1 and HSP12. CONCLUSIONS: Disruption of YCP4 in S. cerevisiae results in increased tolerance to freeze-thaw stress.
OBJECTIVE: This study aimed to identify genes related to freeze-thaw tolerance and elucidate the tolerance mechanism in yeast Saccharomyces cerevisiae as an appropriate eukaryote model. RESULTS: In this study, one tolerant strain exposed to freeze-thaw stress was isolated by screening a transposon-mediated mutant library and the disrupted gene was identified to be YCP4. In addition, this phenotype related to freeze-thaw tolerance was confirmed by deletion and overexpressing of this corresponding gene. This mutant strain showed a freeze-thaw tolerance by reducing the intracellular level of reactive oxygen species and the activation of the MSN2/4 and STRE-mediated genes such as CTT1 and HSP12. CONCLUSIONS: Disruption of YCP4 in S. cerevisiae results in increased tolerance to freeze-thaw stress.