An enzyme that removes phosphate groups from proteins, reversing the action of protein kinases. This dephosphorylation process is essential for turning off cellular signals and resetting proteins to their inactive states.
From 'protein' and 'phosphatase,' with the latter derived from 'phosphate' and the suffix '-ase' indicating an enzyme. The term developed alongside protein kinase research in the mid-20th century as scientists recognized the importance of reversible phosphorylation.
Protein phosphatases are the unsung heroes of cellular regulation - they're like the cleanup crew that turns off molecular switches after the party's over! Without them, cells would be stuck in permanent 'on' mode, leading to chaos and potentially cancer.
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