Guanine nucleotide-binding protein G(q) subunit alpha is a protein that in humans is encoded by the GNAQ gene.[5] Together with GNA11 (its paralogue), it functions as a Gq alpha subunit.[6]
Guanine nucleotide-binding proteins are a family of heterotrimeric proteins that couple cell surface, 7-transmembrane domain receptors to intracellular signaling pathways. Receptor activation catalyzes the exchange of GDP for GTP bound to the inactive G protein alpha subunit resulting in a conformational change and dissociation of the complex. The G protein alpha and beta-gamma subunits are capable of regulating various cellular effectors. Activation is terminated by a GTPase intrinsic to the G-alpha subunit. G-alpha-q is the alpha subunit of one of the heterotrimeric GTP-binding proteins that mediates stimulation of phospholipase C-beta (MIM 600230).[supplied by OMIM][7]
Mutations in this gene have been found associated to cases of Sturge–Weber syndrome and port-wine stains.[8]
GNAQ has been shown to interact with:
PDB gallery
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2bcj: Crystal Structure of G Protein-Coupled Receptor Kinase 2 in Complex with Galpha-q and Gbetagamma Subunits
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MAP |
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Calcium |
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G protein |
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Cyclin |
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Lipid |
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Other protein kinase |
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Other protein phosphatase |
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Apoptosis |
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GTP-binding protein regulators |
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Other |
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see also deficiencies of intracellular signaling peptides and proteins |
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3.6.1 |
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3.6.2 |
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3.6.3-4: ATPase |
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3.6.5: GTPase |
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