This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of various enzymes that catalyze the transfer of a phosphate group from a donor, such as ADP or ATP, to an acceptor.

n. Any of a group of enzymes that transfers phosphate groups from high-energy donor molecules, such as ATP, to specific target molecules (substrates); the process is termed phosphorylation.

n. One of a class of enzymes that catalyze transfer of a phosphate group from ATP to another molecule; it is a type of phosphorylase.

n. A ferment-like body which is capable of rendering physiologically active another ferment and thus produces chemical changes in a third body while in itself it is apparently inert.

n. an enzyme that catalyzes the conversion of a proenzyme to an active enzyme

"Not always necessarily at the same time, but at least to be able to look at protein kinase activity, redox state, gene transcription, protein degradation, localization of DNAs and RNAs by slightly more indirect means, which if you use GFP and RFP to label a protein that in turn binds specifically to your favourite nucleic acid, and the list goes on and on."

enzyme   

phosphatase   

phosphokinase   

tyrosine    effector    receptor    phosphatase    serotonin    immunoglobulin    mitogen-activated    protein    antigen    transduction