An enzyme that adds phosphate groups to other proteins, thereby modifying their activity, location, or interactions. This phosphorylation process is a fundamental mechanism for regulating cellular functions and signal transmission.
From 'protein' and 'kinase,' with kinase derived from Greek 'kinein' meaning to move, referring to the enzyme's ability to move phosphate groups. The term became prominent in the 1950s-60s as researchers discovered the importance of protein phosphorylation in cellular regulation.
Protein kinases are like molecular switches that can instantly change a protein's personality! There are over 500 different protein kinases in humans, and they're involved in virtually every cellular process - it's like having a massive switchboard controlling cellular behavior.
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