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kinase
An enzyme whose function is to activate another enzyme from its precursor. This activation is achieved by transferring a phosphate group (phosphorylation) from ATP (adenosine triphospate), or other high-energy phosphate, to the precursor molecule. For this reason, kinases are also known as phosphotransferases.
The largest group of kinases consists of the protein kinases. An example is peptidase which is secreted by the small intestine and converts trypsinogen to trypsin.
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