G-proteins are membrane associated heterotrimeric proteins comprising of α-, β-, and γ-subunits. The α-subunit contains a guanine-binding domain that is in an inactive state when it is occupied by GDP. Upon activation, GDP is replaced with GTP, causing the dissociation of the α-subunit from the βγ-subunit complex. This enables the Gα-GTP complex to bind to and regulate specific signaling pathways. GTP is then hydrolyzed, allowing for re-association of the α-subunit with the βγ-subunit complex.
Specificity
The sequence is highly conserved among species. The antibody is specific for Gαq11 and Gαq.
Immunogen
synthetic peptide corresponding to amino acids 350-359 of Gαq11 or amino acids 344-353 of Gαq.
Application
Anti-Gαq11, C-terminal antibody produced in rabbit is suitable for immunoprecipitation and western blot analysis at a working dilution of 1:500-1:2000 using 20μg of rat brain microsomal preparation.
Biochem/physiol Actions
Gq α (G11α) regulates the action of phospholipase C (PLC), and results in the release of other intracellular messengers through the inositol phosphate pathway, leading to the release of Ca2+ and the activation of phosphorylation.
Physical form
Solution in phosphate buffered saline, pH 7.4.
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Molecular biology of the cell, 8(2), 279-286 (1997-02-01)
Prolonged treatment with guanosine 5'-[gamma-thio]triphosphate (GTP gamma S; 5-16 h, 50 microM) of smooth muscle permeabilized with Staphylococcus aureus alpha-toxin down-regulated (abolished) the acute Ca2+ sensitization of force by GTP gamma S, AIF-4, phenylephrine, and endothelin, but not the response
In 3-day primary cultures of rat glomerulosa cells, a 30-min pre-incubation with either 10 microM colchicine (a microtubule-disrupting agent) or 10 microM cytochalasin B (a microfilament-disrupting agent) decreased angiotensin II (Ang II)-induced inositol phosphate accumulation by 50%. Moreover, both drugs
Many chaperones promote nascent polypeptide folding followed by substrate release through ATP-dependent conformational changes. Here we show cryoEM structures of Gα subunit folding intermediates in complex with full-length Ric-8A, a unique chaperone-client system in which substrate release is facilitated by
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