Summary
3,4-dihydroxybiphenyl is not a substrate for the 2,3-dihydroxybiphenyl 1,2-dioxygenase (BphC) from biphenyldegradingPseudomonas sp. strain CB406. It acts as both a reversible inhibitor and a potent inactivator of the enzyme. The inactivation process requires the presence of O2 and can be reversed by the removal of the 3,4-dihydroxybiphenyl followed by incubation of the enzyme in the presence of dithioerythritol and Fe2+ under anaerobic conditions. Two other extradiol dioxygenases behave similarly, the catechol 2,3-dioxygenase (BphE) from strain CB406 and the BphC fromPseudomonas sp. strain LB400. The BphC fromP. testosteroni B-356 also did not cleave 3,4-dihydroxybiphenyl but it was not inactivated.
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Abbreviations
- C23o:
-
Catechol 2,3-dioxygenase
- 34DHBP:
-
3,4-dihydroxybiphenyl
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Lloyd-Jones, G., Ogden, R.C. & Williams, P.A. Inactivation of 2,3-dihydroxybiphenyl 1,2-dioxygenase fromPseudomonas sp. strain CB406 by 3,4-dihydroxybiphenyl (4-phenylcatechol). Biodegradation 6, 11–17 (1995). https://doi.org/10.1007/BF00702294
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DOI: https://doi.org/10.1007/BF00702294