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FEMS Microbiol Lett. 2000 Mar 1;184(1):103-8.

Proline accumulation by mutation or disruption of the proline oxidase gene improves resistance to freezing and desiccation stresses in Saccharomyces cerevisiae.

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Department of Bioscience, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka-cho, Yoshida-gun, Fukui, Japan.


We examined the role of intracellular proline under freezing and desiccation stress conditions in Saccharomyces cerevisiae. When cultured in liquid minimal medium, the proline-nonutilizing mutant containing the put1 mutation (proline oxidase-deficient) produced more intracellular proline, and increased the cell survival rate as compared to the wild-type strain after freezing and desiccation. We also constructed two PUT1 gene disruptants. PUT1-disrupted mutants in minimal medium supplemented with external proline at 0.1% accumulated higher proline levels than those of the control strains (17-22-fold). These disruptants also had a 2-5-fold increase in cell viability compared to the control strains after freezing and desiccation stresses. These results indicate that proline has a stress-protective function in yeast.

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