Phthalate dioxygenase reductase (PDR) is a prototypical iron-sulfur flavoprotein (36 kilodaltons) that utilizes flavin mononucleotide (FMN) to mediate electron transfer from the two-electron donor, reduced nicotinamide adenine nucleotide (NADH), to the one-electron acceptor, [2Fe-2S] ...
Phthalate dioxygenase reductase (PDR) is a prototypical iron-sulfur flavoprotein (36 kilodaltons) that utilizes flavin mononucleotide (FMN) to mediate electron transfer from the two-electron donor, reduced nicotinamide adenine nucleotide (NADH), to the one-electron acceptor, [2Fe-2S]. The crystal structure of oxidized PDR from Pseudomonas cepacia has been analyzed at 2.0 angstrom resolution resolution; reduced PDR and pyridine nucleotide complexes have been analyzed at 2.7 angstrom resolution. NADH, FMN, and the [2Fe-2S] cluster, bound to distinct domains, are brought together near a central cleft in the molecule, with only 4.9 angstroms separating the flavin 8-methyl and a cysteine sulfur ligated to iron. The domains that bind FMN and [2Fe-2S] are packed so that the flavin ring and the plane of the [2Fe-2S] core are approximately perpendicular. The [2Fe-2S] group is bound by four cysteines in a site resembling that in plant ferredoxins, but its redox potential (-174 millivolts at pH 7.0) is much higher than the potentials of plant ferredoxins. Structural and sequence similarities assign PDR to a distinct family of flavoprotein reductases, all related to ferredoxin NADP(+)-reductase.
Related Citations:
Crystallographic Characterization of Phthalate Oxygenase Reductase, an Iron-Sulfur Flavoprotein from Pseudomonas Cepacia Correll, C.C., Batie, C.J., Ballou, D.P., Ludwig, M.L. (1985) J Biol Chem 260: 14633
Structure Determination of an Iron-Sulfur Flavoprotein Correll, C.C., Ludwig, M.L. (1991) Flavins And Flavoproteins --: 743
Phthalate Dioxygenase Reductase and Related Flavin-Iron-Sulfur Containing Electron Transferases Batie, C.J., Ballou, D.P., Correll, C.C. (1991) Chemistry And Biochemistry Of Flavoenzymes --: 543
Organizational Affiliation:
Department of Biological Chemistry and Biophysics, University of Michigan, Ann Arbor 48109.
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