title: A novel colorimetric assay and activity staining for cytokinin oxidase based on the copper amine oxidase property of the enzyme.
abstract: A rapid and sensitive colorimetric assay for cytokinin oxidase (CKO) was developed based on the copper amine oxidase property of the enzyme from cucumber cotyledons. The assay involved oxidation of isopentenyl adenine by CKO in the presence of phenazine methosulphate as an electron acceptor, resulting in reduction of nitroblue tetrazolium to formazon. The formation of formazon was linear with time for at least 20 min and could be followed spectrophotometrically at A490. CKO could also be specifically stained on polyacrylamide gels using the same principle.
authors.affiliation: Department of Crop Physiology, UAS, GKVK, Bangalore-560 065, India.
authors.forename: M J
authors.initials: MJ
authors.lastname: Kulkarni
authors.forename: D
authors.initials: D
authors.lastname: Theerthaprasad
authors.forename: L
authors.initials: L
authors.lastname: Sudharshana
authors.forename: T G
authors.initials: TG
authors.lastname: Prasad
authors.forename: V R
authors.initials: VR
authors.lastname: Sashidhar
mesh_terms: D006631:Amine Oxidase (Copper-Containing) / Q000378:metabolism*; D003124:Colorimetry / Q000379:methods*; D018553:Cucumis sativus / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D010088:Oxidoreductases / Q000378:metabolism*
chemical_list: D010088:Oxidoreductases; D006631:Amine Oxidase (Copper-Containing); C019984:cytokinin oxidase