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The catalytic subunit of cAMP-dependent protein kinase has served as a prototype for the protein kinase superfamily for many years while structures of the cAMP-bound regulatory subunits have defined the conserved cyclic nucleotide binding (CNB) motif. It is only structures of the holoenzymes, however, that enable us to appreciate the molecular features of inhibition by the regulatory subunits as well...
Protein kinase A (PKA) holoenzyme is one of the major receptors for cyclic adenosine monophosphate (cAMP), where an extracellular stimulus is translated into a signaling response. We report here the structure of a complex between the PKA catalytic subunit and a mutant RI regulatory subunit, RIα(91–379:R333K), containing both cAMP-binding domains. Upon binding to the catalytic subunit, RI undergoes...
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