Key result
Cyclic AMP-dependent protein kinases from rabbit skeletal and bovine heart muscle share similar subunit structures but differ significantly in their regulatory subunits and cyclic AMP binding affinities.
Authors
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Tissue-specific PKA differences warrant caution extrapolating skeletal data to heart; leaves open isoform-targeted cardiac therapies.
Hofmann et al. (1975) studied this question. Rabbit skeletal muscle cyclic AMP-dependent protein kinase vs. Bovine heart muscle cyclic AMP-dependent protein kinase was evaluated on Biochemical properties including sedimentation constants, mobility, phosphorylation, and dissociation constants. Cyclic AMP-dependent protein kinases from rabbit skeletal and bovine heart muscle share similar subunit structures but differ significantly in their regulatory subunits and cyclic AMP binding affinities.