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The FASEB Journal, Vol 6, 2274-2282, Copyright © 1992 by The Federation of American Societies for Experimental Biology
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LN Johnson
Laboratory of Molecular Biophysics, University of Oxford, England.
Structural studies of muscle glycogen phosphorylase during the last two decades have provided a detailed mechanism for the molecular basis of the control by phosphorylation and by allosteric effectors and the catalytic mechanism. Control by phosphorylation is effected by a disorder to order transition of the NH2-terminal residues that promotes localized changes in the structure of the protein at the region of subunit-subunit contacts and larger changes in the quaternary structure. The covalently attached phosphate group acts like an allosteric effector but the full manifestation of the response is also dependent on the NH2-terminal tail residues. The noncovalently bound allosteric effectors produce similar shifts in the structural states although these are bound at sites that are remote from the serine- phosphate site. The communication from these sites to the catalytic site is through long-range interactions that result in activation of the enzyme through opening access to the buried catalytic site and through creation of the substrate phosphate recognition site by an interchange of an acidic group with a basic group. Recent advances in expression systems have opened the way to a study of properties both for the muscle and other isozymes and other species that should illuminate the different regulatory roles of the enzyme in different tissues and organisms. The allosteric mechanism of activation of phosphorylase by phosphorylation may be relevant to other enzymes although it is now known that other mechanisms such as electrostatic steric blocking mechanisms also exist.
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