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Kinetic and Spectroscopic Characterization of 1-naphthol 2-hydroxylase From Pseudomonas Sp. Strain C5

Kinetic and Spectroscopic Characterization of 1-naphthol 2-hydroxylase From Pseudomonas Sp. Strain C5

Vikas D Trivedi, Prabin Majhi, Prashant S Phale

Appl Biochem Biotechnol. 2014 Apr;172(8):3964-77.

PMID: 24599669

Abstract:

1-Naphthol 2-hydroxylase (1-NH) catalyzes the conversion of 1-naphthol to 1,2-dihydroxynaphthalene. 1-NH from carbaryl degrading Pseudomonas strain C5 was purified and characterized for its kinetic and spectroscopic properties. The enzyme was found to be NAD(P)H-dependent external flavin monooxygenase. Though the kinetic parameters of 1-NH from strain C5 appear to be similar to 1-NH enzyme from strains C4 and C6, however, they differ in their N-terminal sequences, mole content of flavin adenine dinucleotide (FAD), reconstitution of apoenzyme, and K i. 1-NH showed narrow substrate specificity with comparable hydroxylation efficiency on 1-naphthol and 5-amino 1-naphthol (~30 %) followed by 4-chloro 1-naphthol (~9 %). Salicylate was found to be the nonsubstrate effector. The flavin fluorescence of 1-NH was found to increase in the presence of 1-naphthol (K d = 11.3 μM) and salicylate (K d = 1027 μM). The circular dichroism (CD) spectra showed significant perturbations in the presence of NAD(P)H, whereas no changes were observed in the presence of 1-naphthol. Naphthalene, 1-chloronaphthalene, 2-napthol, and 2-naphthoic acid were found to be the mixed inhibitors. Chemical modification studies showed the probable involvement of His, Cys, and Tyr in the binding of 1-naphthol, whereas Trp was found to be involved in the binding of NAD(P)H.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP604444	4-Chloro-1-naphthol		604-44-4	Price

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