Multisite phosphorylation of glycogen synthase from rabbit skeletal muscle. Phosphorylation of site 5 by glycogen synthase kinase-5 (casein kinase-II) is a prerequisite for phosphorylation of sites 3 by glycogen synthase kinase-3.

@article{Picton1982MultisitePO,
  title={Multisite phosphorylation of glycogen synthase from rabbit skeletal muscle. Phosphorylation of site 5 by glycogen synthase kinase-5 (casein kinase-II) is a prerequisite for phosphorylation of sites 3 by glycogen synthase kinase-3.},
  author={Colin Picton and Jim Woodgett and Brian Hemmings and Philip S. Cohen},
  journal={FEBS letters},
  year={1982},
  volume={150 1},
  pages={191-6}
}
Glycogen synthase kinase-5 (casein kinase-II) phosphorylates glycogen synthase on a serine termed site 5. This residue is just C-terminal to the 3 serines phosphorylated by glycogen synthase kinase-3, which are critical for the hormonal regulation of glycogen synthase in vivo. Although phosphorylation of site 5 does not affect the catalytic activity, it is demonstrated that this modification is a prerequisite for phosphorylation by glycogen synthase kinase-3. Since site 5 is almost fully… CONTINUE READING

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