Methionine-defective mutants inCandida utilis |
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Authors: | J M Delgado A Alonso X Alvarez L S Herrera |
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Institution: | 1. Department of Genetics and Biochemistry of Microorganisms, Centro Nacional de Investigaciones Cientificas, P.O. Box 6990, La Habana, Cuba
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Abstract: | Ethionine-resistant mutants ofCandida utilis CCY-158 overproducing methionine have been isolated. In these mutants the intracellular methionine concentration decreased significantly during the stationary phase. The wild-type strain CCY-158 and the ethionine-resistant mutants isolated were able to use methionine as the nitrogen source but not as the carbon source. From these ethionine-resistant mutants we isolated mutants unable to use methionine as nitrogen source (Mec- mutants), the principal alteration being at the level of methionine uptake. Some of the Mec mutants lost also the ability to use other amino acids as nitrogen source. |
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