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Aromatic ring cleavage by homoprotocatechuate 2,3-dioxygenase: role of His200 in the kinetics of interconversion of reaction cycle intermediates

Aromatic ring cleavage by homoprotocatechuate 2,3-dioxygenase: role of His200 in the kinetics of interconversion of reaction cycle intermediates

Biochemistry 44(19): 7175-7188

Homoprotocatechuate 2,3-dioxygenase (WT 2,3-HPCD) isolated from Brevibacterium fuscum utilizes an active site Fe(II) and O-2 to catalyze proximal extradiol cleavage of the aromatic ring of the substrate (HPCA). Here, the conserved active site residue His200 is changed to Gln, Glu, Ala, Asn, and Phe, and the reactions of the mutant enzymes are probed using steady-state and transient kinetic techniques. Each mutant catalyzes ring cleavage of HPCA to yield the normal product.

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Accession: 011778866

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PMID: 15882056

DOI: 10.1021/bi050180v

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