Isoform Beta of cGMP-dependent protein kinase 1

cGMP-dependent protein kinase 1 (PRKG1) is a serine/threonine kinase that mediates cellular signaling downstream of the second messenger cGMP (UniProt: Q13976-2). This isoform is 686 amino acids in length and functions as a key regulatory enzyme in pathways controlled by nitric oxide and natriuretic peptides, which modulate processes including smooth muscle relaxation, platelet aggregation, and neuronal signaling.

PRKG1 is broadly expressed across tissues including the nervous system, where it participates in synaptic plasticity and neurotransmission regulation. The enzyme integrates cGMP-dependent signaling in vascular and neuronal contexts, making it relevant to processes affected in neurodegenerative conditions.

In Alzheimer's Disease, isoform beta of PRKG1 is upregulated in post-mortem brain tissue compared to age-matched controls (Chaparral AD proteomics). The mean log2 fold-change was 0.74, indicating modest but consistent elevation across the analyzed subcellular fractions in a TMT-labeled proteomics experiment. This upregulation may reflect compensatory activation of cGMP-signaling pathways or altered kinase activity in response to AD-related pathology.