Abstract:
:The inactivation of catechol 2,3-dioxygenase from Pseudomonas putida mt-2 by 3-chloro- and 3-fluorocatechol and the iron-chelating agent Tiron (catechol-3,5-disulfonate) was studied. Whereas inactivation by Tiron is an oxygen-independent and mostly reversible process, inactivation by the 3-halocatechols was only observed in the presence of oxygen and was largely irreversible. The rate constants for inactivation (K(2)) were 1.62 x 10 sec for 3-chlorocatechol and 2.38 x 10 sec for 3-fluorocatechol. The inhibitor constants (K(i)) were 23 muM for 3-chlorocatechol and 17 muM for 3-fluorocatechol. The kinetic data for 3-fluorocatechol could only be obtained in the presence of 2-mercaptoethanol. Besides inactivated enzyme, some 2-hydroxyhexa-2,4-diendioic acid was formed from 3-chlorocatechol, suggesting 5-chloroformyl-2-hydroxypenta-2,4-dienoic acid as the actual suicide product of meta-cleavage. A side product of 3-fluorocatechol cleavage is a yellow compound with the spectral characteristics of a 2-hydroxy-6-oxohexa-2,4-dienoic acid indicating 1,6-cleavage. Rates of inactivation by 3-fluorocatechol were reduced in the presence of superoxide dismutase, catalase, formate, and mannitol, which implies that superoxide anion, hydrogen peroxide, and hydroxyl radical exhibit additional inactivation.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Bartels I,Knackmuss HJ,Reineke Wdoi
10.1128/AEM.47.3.500-505.1984keywords:
subject
Has Abstractpub_date
1984-03-01 00:00:00pages
500-5issue
3eissn
0099-2240issn
1098-5336journal_volume
47pub_type
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