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. 1979 May;138(2):425–430. doi: 10.1128/jb.138.2.425-430.1979

Catabolism of L-tyrosine in Trichosporon cutaneum.

V L Sparnins, D G Burbee, S Dagley
PMCID: PMC218194  PMID: 571434

Abstract

Protocatechuic acid was a catabolite in the degradation of L-tyrosine by Trichosporon cutaneum. Intact cells oxidized to completion various compounds proposed as intermediates in this conversion, but they did not readily oxidize catabolites of the homogentisate and homoprotocatechuate metabolic pathways, which are known to function in other organisms. Cell extracts converted tyrosine first to 4-hydroxycinnamic acid and then to 4-hydroxybenzaldehyde and 4-hydroxybenzoic acid. The proposed hydration product of 4-hydroxycinnamic acid, namely, beta-(4-hydroxyphenyl)-hydracrylic acid, was synthesized chemically, and its enzymatic degradation to 4-hydroxybenzaldehyde was shown to be dependent upon additions of adenosine triphosphate and coenzyme A. The hydroxylase that attacked 4-hydroxybenzoate showed a specific requirement for reduced nicotinamide adenine dinucleotide phosphate. Protocatechuate, the product of this reaction, was oxidized by cell extracts supplemented with reduced nicotinamide adenine dinucleotide or, less effectively, with reduced nicotinamide adenine dinucleotide phosphate, but these extracts contained no ring fission dioxygenase for protocatechuate. Evidence is presented that the principal hydroxylation product of protocatechuate was hydroxyquinol, the benzene nucleus of which was cleaved oxidatively to give maleylacetic acid.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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