期刊
CHANNELS
卷 6, 期 5, 页码 379-384出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/chan.21170
关键词
Ca2+ signaling; IP3 receptor; phosphorylation; affinity; phosphomimetic
资金
- National Institutes of Health [GM61829]
- Qatar National Research Fund (QNRF) [NPRP 08-395-3-088]
- Biomedical Research Program funds at Weill Cornell Medical College in Qatar
- Qatar Foundation
- [RO1-DK054568]
The Ins(1,4,5)P-3 receptor acts as a central hub for Ca2+ signaling by integrating multiple signaling modalities into Ca2+ release from intracellular stores downstream of G-protein and tyrosine kinase-coupled receptor stimulation. As such, the Ins(1,4,5)P-3 receptor plays fundamental roles in cellular physiology. The regulation of the Ins(1,4,5)P-3 receptor is complex and involves protein-protein interactions, post-translational modifications, allosteric modulation, and regulation of its sub-cellular distribution. Phosphorylation has been implicated in the sensitization of Ins(1,4,5)P-3-dependent Ca2+ release observed during oocyte maturation. Here we investigate the role of phosphorylation at T-930, a residue phosphorylated specifically during meiosis. We show that a phosphomimetic mutation at T-930 of the rat Ins(1,4,5)P-3 receptor results in decreased Ins(1,4,5)P-3-dependent Ca2+ release and lowers the Ins(1,4,5)P-3 binding affinity of the receptor. These data, coupled to the sensitization of Ins(1,4,5)P-3-dependent Ca2+ release during meiosis, argue that phosphorylation within the coupling domain of the Ins(1,4,5)P-3 receptor acts in a combinatorial fashion to regulate Ins(1,4,5)P-3 receptor function.
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