Sandbox Reserved 1719: Difference between revisions
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The conformations of the G-proteins vary based on their association with a particular membrane receptor due to interactions between the amino acids in the N-terminus of the α subunit and the C-terminus of the receptor.<ref name="Kamato"/> | The conformations of the G-proteins vary based on their association with a particular membrane receptor due to interactions between the amino acids in the N-terminus of the α subunit and the C-terminus of the receptor.<ref name="Kamato"/> | ||
[[Image:Mast cell mechanism.png|400px|right|thumb|'''Figure 9.''' Cellular response of mast cell upon activation of MRGPRX2.]] | [[Image:Mast cell mechanism.png|400px|right|thumb|'''Figure 9.''' Cellular response of mast cell upon activation of MRGPRX2.]] | ||
Binding to the extracellular N-terminus domain triggers a transmembrane conformation change of MRGPRX2, which demonstrates a less significant change when compared to other class A GPCRs due to the surface level binding of the ligand to MRGPRX2.<ref name="Can"/> Once ligand binding and the conformational change to the active state have taken place, the signal is relayed to the α-subunit of the heterotrimeric G-protein.<ref name="nelson"/> The α-subunit will then exchange a GDP for GTP to initiate the dissociation of the α, β, and γ subunits.<ref name="nelson"/> During this dissociation, the α-subunit is able to travel away from the receptor in the plane of the membrane to bind to downstream effectors to produce a cellular response.<ref name="nelson"/> | |||
= Clinical Relevance = | = Clinical Relevance = | ||
