Identification of three in vivo phosphorylation sites on the glycogen‐binding subunit of protein phosphatase 1 from rabbit skeletal muscle, and their response to adrenaline
Open Access
- 1 January 1990
- journal article
- Published by Wiley in FEBS Letters
- Vol. 259 (2), 281-285
- https://doi.org/10.1016/0014-5793(90)80027-g
Abstract
The in vivo phosphorylation stoichiometries of 4 serines on the glycogen‐binding (G)‐subunit of protein phosphatase 1 (PP1) have been determined. In fed rabbits injected with propranolol stoichiometries () were: site 1 (0.67 ± 0.09), site 2 (0.20 ± 0.07), site 3a (0.23 ± 0.01) and site 3b (0). After injection with adrenalin they became: site 1 (0.90±0.02), site 2 (0.72 ± 0.01), site 3a (0.23 ± 0.02) and site 3b (0). These results, together with other data, establish that site 2 phosphorylation by cyclic AMP‐dependent protein kinase triggers dissociation of PP1 from the G‐subunit in vivo. They also demonstrate that a residue phosphorylated in vitro by glycogen synthase kinase 3 (site 3a) is phosphorylated in vivo.Keywords
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