ID 2.5.1.112 DE adenylate dimethylallyltransferase (ADP/ATP-dependent). AN adenylate isopentenyltransferase. AN cytokinin synthase. AN isopentenyltransferase. CA (1) ADP + dimethylallyl diphosphate = diphosphate + N(6)- CA (dimethylallyl)adenosine 5'-diphosphate. CA (2) ATP + dimethylallyl diphosphate = diphosphate + N(6)- CA (dimethylallyl)adenosine 5'-triphosphate. CC -!- Involved in the biosynthesis of cytokinins in plants. CC -!- The IPT4 isoform from the plant Arabidopsis thaliana is specific for CC ADP and ATP. CC -!- Other isoforms, such as IPT1 from Arabidopsis thaliana and the enzyme CC from the common hop, Humulus lupulus, also have a lower activity with CC AMP (cf. EC 2.5.1.27). CC -!- Formerly EC 2.5.1.n4. DR Q94ID3, IPT1_ARATH ; Q93WC9, IPT3_ARATH ; Q9SB60, IPT4_ARATH ; DR Q94ID2, IPT5_ARATH ; Q9C6L1, IPT6_ARATH ; Q94ID1, IPT7_ARATH ; DR Q9LJL4, IPT8_ARATH ; Q5GHF7, IPT_HUMLU ; //