Abstract
A comparison of the refined crystal structures of dimeric glycogen phosphorylase b and a reveals structural changes that represent the first step in the activation of the enzyme. On phosphorylation of serine-14, the N-terminus of each subunit assumes an ordered helical conformation and binds to the surface of the dimer. The consequent structural changes at the N- and C-terminal regions lead to strengthened interactions between subunits and alter the binding sites for allosteric effectors and substrates.
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Sprang, S., Acharya, K., Goldsmith, E. et al. Structural changes in glycogen phosphorylase induced by phosphorylation. Nature 336, 215–221 (1988). https://doi.org/10.1038/336215a0
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DOI: https://doi.org/10.1038/336215a0
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