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Answer for the clue "An enzyme that catalyzes the conversion of a proenzyme to an active enzyme ", 6 letters:
kinase

Word definitions for kinase in dictionaries

Wikipedia Word definitions in Wikipedia
(Pyruvate, phosphate dikinase) kinase (, PPDK regulatory protein , pyruvate , phosphate dikinase regulatory protein , bifunctional dikinase regulatory protein ) is an enzyme with systematic name ADP:(pyruvate, phosphate dikinase) phosphotransferase . This ...

Wiktionary Word definitions in Wiktionary
n. (context enzyme organic compound English) Any of a group of enzymes that transfers phosphate groups from high-energy donor molecules, such as ATP, to specific target molecules (substrates), in a process termed phosphorylation.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1902, from Greek kinein "to move" (see cite ) + chemical suffix -ase .

WordNet Word definitions in WordNet
n. an enzyme that catalyzes the conversion of a proenzyme to an active enzyme

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
kinase \ki"nase\ (k[imac]"n[=a]s), n. (Biochemistry) One of a class of enzymes that catalyze transfer of a phosphate group from ATP to another molecule; it is a type of phosphorylase.

Usage examples of kinase.

Space had been found for the transplanted material in a gene of vaccinia called thymidine kinase, and it multiplied along with its new host.

The membranes of course contain both the proteins and the enzyme that phosphorylates them, protein kinase C.

During memory formation, transmitter (dark arrow: glutamate) released from the presynaptic side interacts with receptor (II) on the postsynaptic side, resulting in phosphorylation of membrane proteins (•) by protein kinase C (PK) and entry of calcium (Ca).