Protein kinase cGMP-dependent 1 alpha (PKG1α)

Protein kinase cGMP-dependent 1 alpha (PKG1α) is a serine/threonine-specific protein kinase that mediates the cellular effects of cyclic GMP in various tissues, including smooth muscle, platelets, and the central nervous system[3][4][5][7][8]. PKG1α is a homodimeric enzyme encoded by the PRKG1 gene and is activated upon binding of cGMP, leading to phosphorylation of downstream targets that regulate muscle tone, platelet aggregation, gene expression, and cellular metabolism[3][4][7]. PKG1α is especially crucial for vascular relaxation, cardiac hypertrophy modulation, and nitric oxide signaling pathways. Dysregulation is implicated in diseases such as cardiovascular disease and cancer, which makes PKG1α an established pharmacological target for modulators of vascular tone and platelet reactivity[3][4][8].

Other names

Protein kinase G 1 alphaPKG1 alphaCyclic GMP-dependent protein kinase 1 alphacGMP-dependent protein kinase 1, alpha isozymePRKG1αPRKG1 (for the encompassing gene, which has alpha and beta isoforms)

Inhibition: small-molecule inhibitors (e.g., KT 5823) block kinase activity by competing at ATP-binding or allosteric sites\nActivation: synthetic cGMP analogues (e.g., 8-Bromo-cGMP) activate PKG1α by mimicking cyclic GMP and triggering kinase activity