cAMP-dependent phosphorylation of Aplysia twitchin may mediate modulation of muscle contractions by neuropeptide cotransmitters.

@article{Probst1994cAMPdependentPO,
  title={cAMP-dependent phosphorylation of Aplysia twitchin may mediate modulation of muscle contractions by neuropeptide cotransmitters.},
  author={Wilfried Probst and Elizabeth C Cropper and J Heierhorst and Scott L. Hooper and Howard Jaffe and Ferdinand S. Vilim and Sven Beushausen and Irving Kupfermann and Klaudiusz R. Weiss},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1994},
  volume={91 18},
  pages={8487-91}
}
Acting through a cAMP-cAMP-dependent protein kinase (cAPK) cascade, members of two neuropeptide families, the small cardioactive peptides and myomodulins, modulate contraction amplitude and relaxation rate in the accessory radula closer (ARC) muscle of the marine mollusc Aplysia californica. An approximately 750-kDa phosphoprotein was identified in the ARC muscle as the major substrate for cAPK activated either by application of neuropeptides or by peptides released by motorneuron stimulation… CONTINUE READING
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