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- W2068131808 abstract "Effectors involved in G protein-coupled receptor signaling modulate activity of GTPases through GTPase-activating protein or guanine nucleotide exchanging factor (GEF). Phospholipase Cδ1 (PLCδ1) is an effector in tissue transglutaminase (TGII)-mediated α<sub>1B</sub>-adrenoreceptor (α<sub>1B</sub>AR) signaling. We investigated whether PLCδ1 modulates TGII activity. PLCδ1 stimulated GDP release from TGII in a concentration-dependent manner, resulting in an increase in GTPγS binding to TGII. PLCδ1 also inhibited GTP hydrolysis by TGII that was independent from the α<sub>1B</sub>AR. These results indicate that PLCδ1 is GEF for TGII and stabilizes the GTP·TGII complex. When GEF function of PLCδ1 was compared with that of the α<sub>1B</sub>AR, the α<sub>1B</sub>AR-mediated GTPγS binding to TGII was greater than PLCδ1-mediated binding and was accelerated in the presence of PLCδ1. Thus, the α<sub>1B</sub>AR is the prime GEF for TGII, and GEF activity of PLCδ1 promotes coupling efficacy of this signaling system. Overexpression of TGII and its mutants with and without PLCδ1 resulted in an increase in α<sub>1B</sub>AR-stimulated Ca<sup>2+</sup> release from intracellular stores in a TGII-specific manner. We conclude that PLCδ1 assists the α<sub>1B</sub>AR function through its GEF action and is primarily activated by the coupling of TGII to the cognate receptors." @default.
- W2068131808 created "2016-06-24" @default.
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- W2068131808 date "2001-02-01" @default.
- W2068131808 modified "2023-10-11" @default.
- W2068131808 title "Phospholipase Cδ1 Is a Guanine Nucleotide Exchanging Factor for Transglutaminase II (Gαh) and Promotes α1B-Adrenoreceptor-mediated GTP Binding and Intracellular Calcium Release" @default.
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- W2068131808 doi "https://doi.org/10.1074/jbc.m008252200" @default.
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