title: P-cresol and 3,5-xylenol methylhydroxylases in Pseudomonas putida N.C.I.B. 9896.
abstract: Pseudomonas putida N.C.I.B. 9869, when grown on 3,5-xylenol, hydroxylates the methyl groups on 3,5-xylenol and on p-cresol by two different enzymes. 3,5-Xylenol methylhydroxylase, studied only in relatively crude extracts, requires NADH, is not active with p-cresol and is inhibited by cyanide, but not by CO. The p-cresol methylhydroxylase requires an electron acceptor and will act under anaerobic conditions. It was purified and is a flavocytochrome c of mol.wt. approx. 114,000 consisting of two subunits of equal size. The enzyme catalyses the hydroxylation of p-cresol (Km 16 micron) and the further oxidation of product, p-hydroxybenzyl alcohol (Km 27 micron) to p-hydroxybenzaldehyde. A different p-cresol methylhydroxylase of the flavocytochrome c type is induced by growth on p-cresol. It too was purified and has mol.wt. approx. 100,000, and again consisted of two equal-size subunits. The Km for p=cresol 3.6 micron and for p=hydroxybenzyl alcohol, 15 micron.
mesh_terms: D003408:Cresols; D004591:Electrophoresis, Polyacrylamide Gel; D005415:Flavins / Q000032:analysis; D007700:Kinetics; D006899:Mixed Function Oxygenases / Q000302:isolation & purification / Q000378:metabolism*; D010084:Oxidation-Reduction; D011549:Pseudomonas / Q000201:enzymology*; D013379:Substrate Specificity; D014992:Xylenes
chemical_list: D003408:Cresols; D005415:Flavins; D014992:Xylenes; D006899:Mixed Function Oxygenases; C023297:3,5-xylenol methylhydroxylase; C016834:3,5-xylenol