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High resolution cryo-EM structures of TRPC5-Gα i3 complexes reveal direct activation of an ion channel by Gα i -GTP.
Cell Calcium 2023 June 14
Transient receptor potential canonical 4 and 5 (TRPC4 and TRPC5) are Ca2+ -permeable nonselective cation channels known to be activated by Gi/o proteins. Recently, Won et al. (Nat Commun. 2023, 14:2550) reported the cryo-EM structures of TRPC5 in complex with Gαi3 . The G protein alpha subunit was found to directly bind to an ankyrin-like repeat domain in the periphery of the cytosolic portion of TRPC5 some 50 Å away from the membrane. This establishes the TRPC4/C5 ion channels as true effectors of Gα subunits, although the channel gating still depends on the coexistence of Ca2+ and phosphatidylinositol 4,5-bisphosphate.
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