Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 430, Issue 2, Pages 865-867Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2012.10.024
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A historical account of the discovery of reversible protein phosphorylation is presented. This process was uncovered in the mid 1950s in a study undertaken with Edwin G. Krebs to elucidate the complex hormonal regulation of skeletal muscle glycogen phosphorylase. Contrary to the known activation of this enzyme by AMP which serves as an allosteric effector, its hormonal regulation results from a phosphorylation of the protein by phosphorylase kinase following the activation of the latter by Ca2+ and ATP. The study led to the establishment of the first hormonal cascade of successive enzymatic reactions, kinases acting on kinases, initiated by cAMP discovered by Earl Sutherland. It also showed how two different physiological processes, carbohydrate metabolism and muscle contraction, could be regulated in concert. (C) 2012 Published by Elsevier Inc.
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