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1-Naphthol 2-hydroxylase from Pseudomonas sp. strain C6: purification, characterization and chemical modification studies

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Title 1-Naphthol 2-hydroxylase from Pseudomonas sp. strain C6: purification, characterization and chemical modification studies
 
Creator SAH, S
PHALE, PS
 
Subject PARA-HYDROXYBENZOATE HYDROXYLASE
ADENINE-DINUCLEOTIDE PHOSPHATE
PHENOL HYDROXYLASE
CRYSTAL-STRUCTURE
CATALYTIC CYCLE
BINDING-SITE
CARBARYL
FLAVIN
RESIDUE
ENZYME
Carbaryl metabolism
1-naphthol 2-hydroxylase
Flavoenzyme
Kinetic properties
Chemical modification
Active-site residues
 
Description 1-Naphthol 2-hydroxylase (1-NH) which catalyzes the conversion of 1-naphthol to 1,2-dihydroxynaphthalene was purified to homogeneity from carbaryl-degrading Pseudomonas sp. strain C6. The enzyme was found to be a homodimer with subunit molecular weight of 66 kDa. UV, visible and fluorescence spectral properties, identification of flavin moiety by HPLC as FAD, and reconstitution of apoenzyme by FAD suggest that enzyme is FAD-dependent. 1-NH accepts electron from NADH as well as NADPH. Besides 1-naphthol (K (m), 9.1 mu M), the enzyme also accepts 5-amino 1-naphthol (K (m), 6.4 mu M) and 4-chloro 1-naphthol (K (m), 2.3 mu M) as substrates. Enzyme showed substrate inhibition phenomenon at high concentration of 1-naphthol (K (i), 283 mu M). Stoichiometric consumption of oxygen and NADH, and biochemical properties suggest that 1-NH belongs to FAD containing external flavomonooxygenase group of oxido-reductase class of enzymes. Based on biochemical and kinetic properties, 1-NH from Pseudomonas sp. strain C6 appears to be different than that reported earlier from Pseudomonas sp. strain C4. Chemical modification and protection by 1-naphthol and NADH suggest that His, Arg, Cys, Tyr and Trp are at or near the active site of 1-NH.
 
Publisher SPRINGER
 
Date 2012-06-26T05:23:23Z
2012-06-26T05:23:23Z
2011
 
Type Article
 
Identifier BIODEGRADATION,22(3)517-526
0923-9820
http://dx.doi.org/10.1007/s10532-010-9424-2
http://dspace.library.iitb.ac.in/jspui/handle/100/13959
 
Language English