Inositol trisphosphate receptor: phosphorylation by protein kinase C and calcium calmodulin-dependent protein kinases in reconstituted lipid vesicles.
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.
Ferris
C D
CD
Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Huganir
R L
RL
Bredt
D S
DS
Cameron
A M
AM
Snyder
S H
SH
D015220:Calcium Channels; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D015544:Inositol 1,4,5-Trisphosphate / Q000378:metabolism*; D053496:Inositol 1,4,5-Trisphosphate Receptors; D007700:Kinetics; D008081:Liposomes; D010449:Peptide Mapping; D010748:Phosphopeptides / Q000302:isolation & purification; D010766:Phosphorylation; D011493:Protein Kinase C / Q000378:metabolism*; D011494:Protein Kinases / Q000378:metabolism*; D011510:Proteolipids / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000378:metabolism*; D018160:Receptors, Cytoplasmic and Nuclear
D015220:Calcium Channels; D053496:Inositol 1,4,5-Trisphosphate Receptors; D008081:Liposomes; D010748:Phosphopeptides; D011510:Proteolipids; D011956:Receptors, Cell Surface; D018160:Receptors, Cytoplasmic and Nuclear; C020485:proteoliposomes; D015544:Inositol 1,4,5-Trisphosphate; D011494:Protein Kinases; D011493:Protein Kinase C; D017871:Calcium-Calmodulin-Dependent Protein Kinases