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. 1985 Sep;163(3):1126–1135. doi: 10.1128/jb.163.3.1126-1135.1985

beta-Ketoadipate pathway in Trichosporon cutaneum modified for methyl-substituted metabolites.

J B Powlowski, S Dagley
PMCID: PMC219248  PMID: 4040904

Abstract

Trichosporon cutaneum, when grown with p-cresol, catalyzed intradiol fission of the benzene nucleus of 4-methylcatechol before the complete catabolism of these two substrates. Steps in their conversion to pyruvate and acetyl coenzyme A were investigated by using cell extracts, and some properties of various new microbial catabolites are also described. These included (-)-2,5-dihydro-3-methyl-5-oxofuran-2-acetic acid (beta-methylmuconolactone) and (-)-3-keto-4-methyladipic acid and its coenzyme A ester; the latter was degraded by an enzymatic reaction sequence that included the coenzyme A esters of methylsuccinic, itaconic, and citramalic acids. A notable feature of this sequence is the formation of beta-methylmuconolactone which can be readily metabolized, in contrast to the analogous reaction in bacteria that gives the "dead-end" compound gamma-methylmuconolactone; this compound cannot be enzymatically degraded and so renders the beta-ketoadipate pathway unavailable for methyl-substituted bacterial sources of carbon that are catabolized by way of 4-methylcatechol.

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Selected References

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