Isolation of mutants lacking branched-chain amino acid transaminase |
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Authors: | Carol Jones Emma E Moore |
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Institution: | (1) Eleanor Roosevelt Institute for Cancer Research, Department of Biophysics and Genetics, University of Colorado Medical Center, 80220 Denver, Colorado |
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Abstract: | Variants of the Chinese hamster ovary cell have been isolated which can no longer grow when valine, leucine, or isoleucine is replaced in the culture medium by its respective -keto acid: -ketoisovaleric acid, -ketoisocaproic acid, or -keto- -methylvaleric acid. These variants lack branched-chain amino acid transaminase activity. Evidence is presented indicating these variants to be single gene mutants. Genetic evidence is also presented confirming previous biochemical evidence that a single enzyme carries out transaminase functions on valine, leucine, and isoleucine. The branched-chain transaminase-deficient (trans–)mutants can be reverted to wild-type behavior by treatment with mutagenic agents. These mutants promise to be useful in exploring regulatory mechanisms in biochemical, genetic, and cancer research.Trainee, U.S. Public Health Service Grant No. GM00781-17. |
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