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J Bacteriol. 1983 August; 155(2): 505-511

Naphthalene dioxygenase: purification and properties of a terminal oxygenase component.

ABSTRACT

Naphthalene dioxygenase from Pseudomonas sp. strain NCIB 9816 is a multicomponent enzyme system that oxidized naphthalene to cis-(1R, 2S)-dihydroxy-1,2-dihydronaphthalene. The terminal oxygenase component B was purified to homogeneity by a three-step procedure that utilized ion-exchange and hydrophobic interaction chromatography. The purified enzyme oxidized naphthalene only in the presence of NADH, oxygen, and partially purified preparations of components A and C. An estimated Mr of 158,000 was obtained by gel filtration. Polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate revealed the presence of two subunits with molecular weights of ca. 55,000 and 20,000, indicative of an alpha 2 beta 2 quaternary structure. Absorption spectra of the oxidized enzyme showed maxima at 566 (shoulder), 462, and 344 nm, which were replaced by absorption maxima at 520 and 380 nm when the enzyme was reduced anaerobically by stoichiometric quantities of NADH in the presence of the other two components of the naphthalene dioxygenase system. Component B bound naphthalene. Enzyme-bound naphthalene was oxidized to product upon the addition of components A and C, NADH, and O2. These results, together with the detection of the presence of 6.0 g-atoms of iron and 4.0 g-atoms of acid-labile sulfur per mol of the purified enzyme, suggest that component B of the naphthalene dioxygenase system is an iron-sulfur protein which functions in the terminal step of naphthalene oxidation.

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