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FEMS Microbiol Lett. 1991 Aug 1;66(2):209-13.

The route of lysine breakdown in Candida tropicalis.

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  • 1Department of Applied Biology, University of Hull, U.K.


Candida tropicalis was found to contain high levels of the following enzymes after growth in defined medium on L-lysine as sole nitrogen source: L-lysine N6-acetyltransferase, N6-acetyl-lysine aminotransferase, and aminotransferase activity for 5-aminovalerate and 4-aminobutyrate. Extracts were also capable of converting 5-acetamidovalerate (and 4-acetamidobutyrate) to acetate. N6-Acetyllysine however, only gave rise to acetate in the presence of 2-oxoglutarate, NAD+ and thiamine pyrophosphate. These activities were undetectable or present in much lower concentrations in cells that had been grown on ammonium sulphate as sole nitrogen source. It is concluded that L-lysine is degraded in this organism via N6-acetyllysine, 5-acetamidovalerate and 5-aminovalerate, both nitrogen atoms being removed by transamination.

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