Protein Kinase, cAMP Dependent Catalytic Gamma (PRKACg)

Cyclic AMP-dependent protein kinase (PKA) consists of two catalytic subunits and a regulatory subunit dimer. This gene encodes the gamma form of its catalytic subunit. The gene is intronless and is thought to be a retrotransposon derived from the gene for the alpha form of the PKA catalytic subunit.The PRKACG gene is intronless, contains remnants of a poly(A) tail, is flanked by direct repeats, and is colinear with the PRKACA gene. Thus, the authors concluded that the PRKACG gene is a PRKACA-derived retroposon. Northern blot analysis detected PRKACG expression in fractionated germ cells of human testes.Whereas at the amino acid level C-alpha and C-beta showed 93% homology, C-gamma showed only about 80% homology to both C-alpha and C-beta.