UAS regulatory sequences drive expression of a mutant form of Pka-R1 that contains mutations in two cAMP binding sites (amino acid replacements G196E and G321D). This mutant regulatory subunit acts as an inhibitor of protein kinase A (PKA) activity; the mutations slightly reduce affinity for the catalytic subunit in vitro and makes the regulatory subunit entirely insensitive to cAMP.
Encodes a dominant negative regulatory form of Pka-R1.
report comment: Pka-R1 allele in this construct is a mutant form which inhibits PKA function.