期刊
GENES & GENETIC SYSTEMS
卷 81, 期 6, 页码 391-397出版社
GENETICS SOC JAPAN
DOI: 10.1266/ggs.81.391
关键词
budding yeast; proofreading-deficient DNA polymerase; mutator; thermotolerance
Eukaryotic DNA polymerases 6 and F, both of which are required for chromosomal DNA replication, contain proofreading 3'-> 5'exonuclease activity. DNA polymerases lacking proofreading activity act as strong imitators. Here we report isolation of thermotolerant mutants by using a proofreading-deficient DNA polymerase 8 variant encoded by pol3-01 in the yeast Saccharomyces cerevisiae. The parental pol3-01 strain grew only poorly at temperatures higher than 38 degrees C. By stepwise elevation of the incubation temperature, thermotolerant mutants that could proliferate at 40 degrees C were successfully obtained; however, no such mutants were isolated with the isogenic POL3 strain. The recessive hot1-1 mutation was defined by genetic analysis of a weak thermotolerant mutant. Strong thermotolerance to 40 degrees C was attained by multiple mutations, at least one of which was recessive. These results indicate that a proofreading-deficient DNA 8 polymerase variant is an effective mutator for obtaining yeast mutants that have gained useful characteristics, such as the ability to proliferate in harsh environments.
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