Control of calcium oscillations by phosphorylation of metabotropic glutamate receptors - PubMed (original) (raw)
. 1996 Sep 5;383(6595):89-92.
doi: 10.1038/383089a0.
Affiliations
- PMID: 8779726
- DOI: 10.1038/383089a0
Control of calcium oscillations by phosphorylation of metabotropic glutamate receptors
S Kawabata et al. Nature. 1996.
Abstract
Stimulation of two metabotropic glutamate-receptor subtypes, mGluR1 and mGluR5, triggers the release of Ca2+ from intracellular stores through the inositol-(1,4,5) trisphosphate (InsP3) pathway. Here we report that glutamate induces single-peaked intracellular Ca2+ mobilization in mGluR1alpha-transfected cells but elicits Ca2+ oscillations in mGluR5a-transfected cells. The response patterns of the intracellular Ca2+ increase depend upon the identity of a single amino acid, aspartate (at position 854) or threonine (at position 840), located within the G-protein-interacting domains of mGluR1alpha and mGluR5a, respectively. Pharmacological and peptide mapping analyses indicated that phosphorylation of the threonine residue at position 840 of mGluR5a by protein kinase C (PKC) is responsible for the generation of Ca2+ oscillations in mGluR5a-expressing cells. To our knowledge this is the first evidence that PKC phosphorylation of G-protein-coupled receptors is important in producing oscillations in intracellular Ca2+ signalling.
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