======= GNAT3 ======= == Gene Information == * **Official Symbol**: GNAT3 * **Official Name**: G protein subunit alpha transducin 3 * **Aliases and Previous Symbols**: N/A * **Entrez ID**: [[https://www.ncbi.nlm.nih.gov/gene/?term=346562|346562]] * **UniProt**: [[https://www.uniprot.org/uniprot/A8MTJ3|A8MTJ3]] * **Interactions**: [[https://thebiogrid.org/search.php?search=GNAT3&organism=9606|BioGRID]] * **PubMed articles**: [[https://www.ncbi.nlm.nih.gov/pubmed/?term=gene%20GNAT3|Open PubMed]] * **OMIM**: [[https://omim.org/entry/139395|Open OMIM]] == Function Summary == * **Entrez Summary**: N/A * **UniProt Summary**: Guanine nucleotide-binding protein (G protein) alpha subunit playing a prominent role in bitter and sweet taste transduction as well as in umami (monosodium glutamate, monopotassium glutamate, and inosine monophosphate) taste transduction. Transduction by this alpha subunit involves coupling of specific cell-surface receptors with a cGMP-phosphodiesterase; Activation of phosphodiesterase lowers intracellular levels of cAMP and cGMP which may open a cyclic nucleotide-suppressible cation channel leading to influx of calcium, ultimately leading to release of neurotransmitter. Indeed, denatonium and strychnine induce transient reduction in cAMP and cGMP in taste tissue, whereas this decrease is inhibited by GNAT3 antibody. Gustducin heterotrimer transduces response to bitter and sweet compounds via regulation of phosphodiesterase for alpha subunit, as well as via activation of phospholipase C for beta and gamma subunits, with ultimate increase inositol trisphosphate and increase of intracellular Calcium. GNAT3 can functionally couple to taste receptors to transmit intracellular signal: receptor heterodimer TAS1R2/TAS1R3 senses sweetness and TAS1R1/TAS1R3 transduces umami taste, whereas the T2R family GPCRs act as bitter sensors. Functions also as lumenal sugar sensors in the gut to control the expression of the Na+-glucose transporter SGLT1 in response to dietaty sugar, as well as the secretion of Glucagon-like peptide- 1, GLP-1 and glucose-dependent insulinotropic polypeptide, GIP. Thus, may modulate the gut capacity to absorb sugars, with implications in malabsorption syndromes and diet-related disorders including diabetes and obesity. {ECO:0000269|PubMed:11917125, ECO:0000269|PubMed:17724330}. |Arf| |G-alpha| |sensory perception of umami taste| |sensory perception of sweet taste| |G-protein beta/gamma-subunit complex binding| |heterotrimeric G-protein complex| |detection of chemical stimulus involved in sensory perception of bitter taste| |sensory perception of bitter taste| |detection of chemical stimulus involved in sensory perception of taste| |photoreceptor inner segment| |response to nicotine| |photoreceptor outer segment| |G protein-coupled receptor binding| |sensory perception of taste| |adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway| |acrosomal vesicle| |axoneme| |adenylate cyclase-modulating G protein-coupled receptor signaling pathway| |protein folding| |G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger| |apical plasma membrane| |GTPase activity| |GTP binding| |detection of chemical stimulus involved in sensory perception| |response to toxic substance| |detection of chemical stimulus| |sensory perception of chemical stimulus| |detection of stimulus involved in sensory perception| |protein-containing complex| |detection of stimulus| |sensory perception| |response to drug| |G protein-coupled receptor signaling pathway| |nervous system process| |system process| \\ === CRISPR Data === No hits were found. No correlation found to any other genes in chemogenomics. Global Fraction of Cell Lines Where Essential: 0/739 ^Tissue^Fraction Of Cell Lines Where Essential^ |1290807.0|0/1| |909776.0|0/1| |bile duct|0/28| |blood|0/28| |bone|0/26| |breast|0/33| |central nervous system|0/56| |cervix|0/4| |colorectal|0/17| |esophagus|0/13| |fibroblast|0/1| |gastric|0/16| |kidney|0/21| |liver|0/20| |lung|0/75| |lymphocyte|0/16| |ovary|0/26| |pancreas|0/24| |peripheral nervous system|0/16| |plasma cell|0/15| |prostate|0/1| |skin|0/24| |soft tissue|0/9| |thyroid|0/2| |upper aerodigestive|0/22| |urinary tract|0/29| |uterus|0/5| == Essentiality in NALM6 == * **Essentiality Rank**: 12557 * **Expression level (log2 read counts)**: -7.68 {{:chemogenomics:nalm6 dist.png?nolink |}}