G protein
noun Etymology: guanosine triphosphate-binding protein Date: 1967 any of a class of cell membrane proteins that are coupled to cell surface receptors and upon stimulation of the receptor by an extracellular signaling molecule (as a hormone or neurotransmitter) bind to GTP to form an active complex which mediates an intracellular event (as activation of adenylate cyclase)

New Collegiate Dictionary. 2001.

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  • G protein — [ Phosducin transducin beta gamma complex. Beta and gamma subunits of G protein are shown by blue and red, respectively.] G proteins, short for guanine nucleotide binding proteins, are a family of proteins involved in second messenger cascades. G …   Wikipedia

  • G-Protein — Die Bezeichnung G Protein steht vereinfacht für Guaninnucleotid bindendes Protein oder GTP bindendes Protein. G Proteine besetzen eine Schlüsselposition in der Signalweiterleitung (Signaltransduktion) zwischen Rezeptor und Second Messenger… …   Deutsch Wikipedia

  • G protein — These molecules have been described as biological traffic lights. Located inside the cell, G proteins are able respond to signals outside the cell light, smell, hormones and translate (transduce) these signals into action within the cell. Alfred… …   Medical dictionary

  • G protein — Proteins found on the inner surface of the plasma membrane, which bind to the guanine nucleotides, GTP and GDP. They transmit signals from outside the membrane, via trans membrane (G protein coupled) receptors, to adenylate cyclase, which… …   Glossary of Biotechnology

  • G-protein — G pro·tein (jēʹprō tēn , tē ĭn) n. Any of a class of cell membrane proteins that function as intermediaries between hormone receptors and effector enzymes and enable the cell to regulate its metabolism in response to hormonal changes.   [From GTP …   Universalium

  • G-Protein — G Pro|te|in [Abk. für Guaninnukleotidebindendes Protein]: Sammelbez. für aus 3 Untereinheiten bestehende Proteine, die durch reversible Bindung an die ↑ Guanosinphosphate GTP u. GDP physiol. Signalfortleitungsprozesse in Gang setzen u.… …   Universal-Lexikon

  • g protein — noun Usage: usually capitalized G Etymology: guanosine triphosphate binding protein : any of a class of cell membrane proteins that are coupled to cell surface receptors and upon stimulation of the receptor by an extracellular signalling molecule …   Useful english dictionary

  • G-protein — (1) See GTP binding proteins. (2) The spike glycoprotein of vesicular stomatitis virus. This has been an important protein for investigation of membrane transport in eukaryotic cells …   Dictionary of molecular biology

  • G protein — noun Any of a class of proteins, found in cell membranes, that pass signals between hormone receptors and effector enzymes …   Wiktionary

  • G protein-coupled receptor — G protein coupled receptors (GPCRs), also known as seven transmembrane domain receptors, 7TM receptors, heptahelical receptors, and G protein linked receptors (GPLR), comprise a large protein family of transmembrane receptors that sense molecules …   Wikipedia

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