Human Gene Set: KEGG_TASTE_TRANSDUCTION


Standard name KEGG_TASTE_TRANSDUCTION
Systematic name M5785
Brief description Taste transduction
Full description or abstract All taste pathways are proposed to converge on common elements that mediate a rise in intracellular Ca2+ followed by neurotransmitter release. Na+ salt depolarizes taste cells by passive influx of Na+ through the amiloride-sensitive Na+ channel (ENaC). Acids depolarize taste cells by a variety of mechanisms, including influx of protons (H+) through ENaC and a proton-gated cation channel (MDEG). Two putative umami receptors have been identified: a truncated variant of the metabotropic glutamate receptor mGluR4 and the heterodimer, T1R1 + T1R3. Umami receptors are coupled to a signaling pathway involving activation of PLCbeta2, production of IP3 and diacylglycerol, release of Ca2+ from intracellular stores and activation of a transient receptor potential channel, TRPM5. Bitter compounds, such as denatonium and PROP, activate particular T2R/TRB isoforms, which activate gustducin heterotrimers. Activated alpha-gustducin stimulates PDE to hydrolyze cAMP, whereas betagamma subunits activate PLCbeta2 to generate IP3, which leads to release of Ca2+ from internal stores. Artificial sweeteners activate GPCRs (T1R heterodimers) apparently linked via PLC to IP3 production and release of Ca2+ from intracellular stores. Sugars apparently activate GPCRs linked via AC to cAMP production which, in turn, may inhibit basolateral K+ channels through phosphorylation by cAMP-activated protein kinase A (PKA).
Collection C2: Curated
      CP: Canonical Pathways
            CP:KEGG_LEGACY: KEGG Legacy Pathways
Source publication  
Exact source hsa04742
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External links http://www.genome.jp/pathway/hsa04742
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Source species Homo sapiens
Contributed by KEGG (Kyoto Encyclopedia of Genes and Genomes)
Source platform or
identifier namespace		 Human_NCBI_Gene_ID
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Version history  

The content of the gene sets in the KEGG_LEGACY collection has not been updated since KEGG restricted their usage terms in 2011. More recent sets are available in the KEGG_MEDICUS collection, derived from KEGG's openly available MEDICUS subset.



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MSigDB gene sets derived from Legacy KEGG pathways are protected by copyright, (c) 1995-2017 Kanehisa Laboratories, all rights reserved. They are provided for use in the MSigDB collection under license to the Broad Institute, Inc., with qualified permission to include in this release. End users are directed to http://www.pathway.jp/ and http://www.kegg.jp/kegg/docs/plea.html for information on the copyright holder's academic and commercial licensing policies. Inclusion of these gene sets herein is conditioned upon acknowledgment and retention of the aforementioned copyright, and compliance with such policies. These KEGG derived gene sets are in a subcollection MSigDB C2 named "KEGG_LEGACY", and can be recognized by the "KEGG_" prefix (without "MEDICUS") in their name.

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