ID 1.5.99.12 DE cytokinin dehydrogenase. AN cytokinin oxidase. CA A + H2O + N(6)-dimethylallyladenine = 3-methyl-2-butenal + adenine + AH2. CC -!- Catalyzes the oxidation of cytokinins, a family of N(6)-substituted CC adenine derivatives that are plant hormones, where the substituent is CC a prenyl group. CC -!- Although this activity was previously thought to be catalyzed by a CC hydrogen-peroxide-forming oxidase, this enzyme does not require CC oxygen for activity and does not form hydrogen peroxide. CC -!- 2,6-dichloroindophenol, methylene blue, nitroblue tetrazolium, CC phenazine methosulfate and copper(II) in the presence of imidazole CC can act as acceptors. CC -!- This enzyme plays a part in regulating rice-grain production, with CC lower levels of the enzyme resulting in enhanced grain production. DR Q5Z620, CKX10_ORYSJ; Q6Z955, CKX11_ORYSJ; O22213, CKX1_ARATH ; DR Q9T0N8, CKX1_MAIZE ; Q0JQ12, CKX1_ORYSJ ; Q9FUJ3, CKX2_ARATH ; DR Q4ADV8, CKX2_ORYSJ ; Q9LTS3, CKX3_ARATH ; Q8LNV6, CKX3_ORYSJ ; DR Q9FUJ2, CKX4_ARATH ; Q5JLP4, CKX4_ORYSJ ; Q67YU0, CKX5_ARATH ; DR Q5ZAY9, CKX5_ORYSJ ; Q9LY71, CKX6_ARATH ; Q6YW51, CKX6_ORYSJ ; DR Q9FUJ1, CKX7_ARATH ; Q6YW50, CKX7_ORYSJ ; A2XVN3, CKX8_ORYSI ; DR A3AVP1, CKX8_ORYSJ ; Q75K78, CKX9_ORYSJ ; P58763, CKX_WHEAT ; //