Abstract
We have previously demonstrated that the inositol 1,4,5-trisphosphate (IP3) receptor is phosphorylated by cyclic AMP-dependent protein kinase (PKA). In the present study, phosphorylation of IP3 receptors has been examined with purified receptor protein reconstituted in liposomes to remove detergent that can inhibit protein kinases. The IP3 receptor is stoichiometrically phosphorylated by protein kinase C (PKC) and Ca2+ calmodulin-dependent protein kinase II (CaM kinase II) as well as by PKA. Phosphorylation by the three enzymes is additive and involves different peptide sequences. Phosphorylation by PKC, which is stimulated by Ca2+ and diacylglycerol, and by CaM kinase II, which requires Ca2+, provides means whereby Ca2+ and diacylglycerol, formed during inositol phospholipid turnover, may regulate IP3 receptor physiology.
MeSH Terms
Calcium Channels
Calcium-Calmodulin-Dependent Protein Kinases
Inositol 1,4,5-Trisphosphate/metabolism
Inositol 1,4,5-Trisphosphate Receptors
Kinetics
Liposomes
Peptide Mapping
Phosphopeptides/isolation & purification
Phosphorylation
Protein Kinase C/metabolism
Protein Kinases/metabolism
Proteolipids/metabolism
Receptors, Cell Surface/metabolism
Receptors, Cytoplasmic and Nuclear
Chemicals
Calcium Channels
Inositol 1,4,5-Trisphosphate Receptors
Liposomes
Phosphopeptides
Proteolipids
Receptors, Cell Surface
Receptors, Cytoplasmic and Nuclear
proteoliposomes
Inositol 1,4,5-Trisphosphate
Protein Kinases
Protein Kinase C
Calcium-Calmodulin-Dependent Protein Kinases
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Ferris C D
Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Huganir R L
Bredt D S
Cameron A M
Snyder S H
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