Adenylate dimethylallyltransferase () is an enzyme first characterised from tobacco that catalyzes a chemical reaction which converts adenosine monophosphate to N(6)-(dimethylallyl)adenosine 5'-monophosphate. It transfers an isoprenyl group from dimethylallyl pyrophosphate, giving orthophosphate (PPi) as a byproduct. The reaction is part of the pathway to cytokinin plant hormones such as zeatin. the enzyme has also been found in Arabidopsis thaliana and Humulus lupulus.
This enzyme is a transferase, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is dimethylallyl-diphosphate:AMP dimethylallyltransferase. Other names in common use include cytokinin synthase, isopentenyltransferase, 2-isopentenyl-diphosphate:AMP Delta2-isopentenyltransferase, and adenylate isopentenyltransferase.
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