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Degradation and dehalogenation of monochlorophenols by the phenol-assimilating yeastCandida maltosa

✍ Scribed by Elke Polnisch; Helmut Kneifel; Heiko Franzke; Klaus H. Hofmann

Publisher: Springer Netherlands
Year: 1992
Tongue: English
Weight: 490 KB
Volume: 2
Category: Article
ISSN: 0923-9820
DOI: 10.1007/bf00124493

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✦ Synopsis

The phenol-assimilating yeast Candida maltosa is able to degrade monochlorophenols but cannot grow on these substrates. 3-and 4-chlorophenot were broken down very rapidly by phenol-grown cells under the formation of 4-chlorocatechol, 5-chloropyrogallol and 4-carboxymethylenebut-2-en-4-olide with concomitant release of chloride.

2-Chlorophenol was partially converted into cis,cis-2-chloromuconic acid via 3-chlorocatechol which was also obtained from 3-chlorophenol in low amounts. No further metabolites containing chloride were found.

The dehalogenation step in the chlorophenol degradation is the cycloisomerization of the cis,cis-chloromuconic acid to 4-carboxymethylenebut-2-en-4-olide in the ortho fission pathway.

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