Journal
BIOCHEMISTRY
Volume 49, Issue 31, Pages 6505-6507Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi101006j
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Funding
- National Institutes of Health [DK032953]
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Phosphorylase kinase (PhK), an (alpha beta gamma delta)(4) complex, stimulates energy production from glycogen in the cascade activation of glycogenolysis. Its large homologous alpha and beta subunits regulate the activity of the catalytic gamma subunit and account for 81% of PhK's mass. Both subunits are thought to be multidomain structures, and recent predictions based on their sequences suggest the presence of potentially functional glucoamylase (GH15)-like domains near their amino termini. We present the first experimental evidence of such a domain in PhK by demonstrating that the glucoamylase inhibitor acarbose binds PhK, perturbs its structure, and stimulates its kinase activity.
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