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Science. 1995 Nov 10;270(5238):976-80.

Crystal structure of the biphenyl-cleaving extradiol dioxygenase from a PCB-degrading pseudomonad.

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  • 1Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA.


Polychlorinated biphenyls (PCBs) typify a class of stable aromatic pollutants that are targeted by bioremediation strategies. In the aerobic degradation of biphenyl by bacteria, the key step of ring cleavage is catalyzed by an Fe(II)-dependent extradiol dioxygenase. The crystal structure of 2,3-dihydroxybiphenyl 1,2-dioxygenase from a PCB-degrading strain of Pseudomonas cepacia has been determined at 1.9 angstrom resolution. The monomer comprises amino- and carboxyl-terminal domains. Structural homology between and within the domains reveals evolutionary relationships within the extradiol dioxygenase family. The iron atom has five ligands in square pyramidal geometry: one glutamate and two histidine side chains, and two water molecules.

[PubMed - indexed for MEDLINE]
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