biphenyl-2,3-diol 1,2-dioxygenase;
2,3-dihydroxybiphenyl dioxygenase;
biphenyl-2,3-diol dioxygenase;
bphC (gene name)

Oxidoreductases;
Acting on single donors with O2 as oxidant and incorporation of oxygen into the substrate (oxygenases). The oxygen incorporated need not be derived from O2;
With incorporation of two atoms of oxygen

biphenyl-2,3-diol:oxygen 1,2-oxidoreductase (decyclizing)

biphenyl-2,3-diol + O2 = 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoate [RN:R03462]

R03462;
(other) R05245 R07827

biphenyl-2,3-diol [CPD:C02526];
O2 [CPD:C00007]

Contains Fe2+ or Mn2+ [3]. This enzyme participates in the degradation pathway of biphenyl and PCB (poly chlorinated biphenyls), and catalyses the first ring cleavage step by incorporating two oxygen atoms into the catechol ring formed by EC 1.3.1.56, cis-2,3-dihydrobiphenyl-2,3-diol dehydrogenase.
The enzyme from the bacterium Burkholderia xenovorans LB400 can also process catechol, 3-methylcatechol, and 4-methylcatechol, but less efficiently [1]. The enzyme from the carbazole-degrader Pseudomonas resinovorans strain CA10 also accepts 2'-aminobiphenyl-2,3-diol [5]. The enzyme from Ralstonia sp. SBUG 290 can also accept 1,2-dihydroxydibenzofuran and 1,2-dihydroxynaphthalene [4]. The enzyme is strongly inhibited by the substrate [1].
Not identical with EC 1.13.11.2 catechol 2,3-dioxygenase.

1  [PMID:8428946]

Eltis LD, Hofmann B, Hecht HJ, Lunsdorf H, Timmis KN

Purification and crystallization of 2,3-dihydroxybiphenyl 1,2-dioxygenase.

J. Biol. Chem. 268 (1993) 2727-32.

2  [PMID:11293547]

Uragami Y, Senda T, Sugimoto K, Sato N, Nagarajan V, Masai E, Fukuda M, Mitsu Y

Crystal structures of substrate free and complex forms of reactivated BphC, an extradiol type ring-cleavage dioxygenase.

J. Inorg. Biochem. 83 (2001) 269-79.

3  [PMID:12672826]

Hatta T, Mukerjee-Dhar G, Damborsky J, Kiyohara H, Kimbara K

Characterization of a novel thermostable Mn(II)-dependent 2,3-dihydroxybiphenyl 1,2-dioxygenase from a polychlorinated biphenyl- and naphthalene-degrading Bacillus sp. JF8.

J. Biol. Chem. 278 (2003) 21483-92.

4  [PMID:15715866]

Wesche J, Hammer E, Becher D, Burchhardt G, Schauer F

The bphC gene-encoded 2,3-dihydroxybiphenyl-1,2-dioxygenase is involved in complete degradation of dibenzofuran by the biphenyl-degrading bacterium Ralstonia sp. SBUG 290.

J. Appl. Microbiol. 98 (2005) 635-45.

5  [PMID:12728990]

Iwata K, Nojiri H, Shimizu K, Yoshida T, Habe H, Omori T

Expression, purification, and characterization of 2'-aminobiphenyl-2,3-diol 1,2-dioxygenase from carbazole-degrader Pseudomonas resinovorans strain CA10.

Biosci. Biotechnol. Biochem. 67 (2003) 300-7.