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Biochim Biophys Acta. 2011 Dec;1814(12):1609-15. doi: 10.1016/j.bbapap.2011.05.023. Epub 2011 Jun 13.

The reducing component BoxA of benzoyl-coenzyme A epoxidase from Azoarcus evansii is a [4Fe-4S] protein.

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Mikrobiologie, Fakultät Biologie, Schänzlestrasse 1, Universität Freiburg, Freiburg, Germany.


BoxA is the reductase component of the benzoyl-coenzyme A (CoA) oxidizing epoxidase enzyme system BoxAB. The enzyme catalyzes the key step of an hitherto unknown aerobic, CoA-dependent pathway of benzoate metabolism, which is the epoxidation of benzoyl-CoA to the non-aromatic 2,3-epoxybenzoyl-CoA. The function of BoxA is the transfer of two electrons from NADPH to the epoxidase component BoxB. We could show recently that BoxB is a diiron enzyme, whereas here we demonstrate that BoxA harbors an FAD and two [4Fe-4S] clusters per protein monomer. The characterization of BoxA was hampered by severe oxygen sensitivity; the cubane [4Fe-4S] clusters degrade already with traces of oxygen. Interestingly, the adventitiously formed [3Fe-4S] centers could be reconstituted in vitro by adding Fe(II) and sulfide to retrieve the native cubane centers. BoxA is the first example of a reductase of this type that has an FAD and two bacterial ferredoxin-type [4Fe-4S] clusters. In other cases within the catalytically versatile family of diiron enzymes, the related reductases have plant-type ferredoxin or Rieske-type [2Fe-2S] centers only.

[Indexed for MEDLINE]

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