Protein kinase

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This editable Main Article is under development and subject to a disclaimer.

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In biochemistry, protein kinases are "a family of enzymes that catalyze the conversion of ATP and a protein to ADP and a phosphoprotein."[1]

In signal transduction, cell surface receptors may activate second messenger systems such as adenyl cyclase-cyclic AMP and cyclic GMP which then may activate protein kinases which then affect downstream targets (see figure).[2]

Examples of protein kinases include G-protein-coupled receptor kinases.

## References[edit]

1. ↑ Anonymous (2025), Protein kinase (English). Medical Subject Headings. U.S. National Library of Medicine.
2. ↑ Lodish, Harvey F. (1999). “20.1. Overview of Extracellular Signaling”, Molecular cell biology. New York: Scientific American Books. ISBN 0-7167-3136-3.