5wuf

Structural basis for conductance through TRIC cation channels

spinqualitylabelsall models 5wuf, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5wuf is a 1 chain structure with sequence from Colwellia psychrerythraea 34H. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.401Å Ligands: CD, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q47UY7_COLP3 Publication Abstract from PubMed Mammalian TRICs function as K+-permeable cation channels that provide counter ions for Ca2+ handling in intracellular stores. Here we describe the structures of two prokaryotic homologues, archaeal SaTRIC and bacterial CpTRIC, showing that TRIC channels are symmetrical trimers with transmembrane pores through each protomer. Each pore holds a string of water molecules centred at kinked helices in two inverted-repeat triple-helix bundles (THBs). The pores are locked in a closed state by a hydrogen bond network at the C terminus of the THBs, which is lost when the pores assume an open conformation. The transition between the open and close states seems to be mediated by cation binding to conserved residues along the three-fold axis. Electrophysiology and mutagenesis studies show that prokaryotic TRICs have similar functional properties to those of mammalian TRICs and implicate the three-fold axis in the allosteric regulation of the channel. Structural basis for conductance through TRIC cation channels.,Su M, Gao F, Yuan Q, Mao Y, Li DL, Guo Y, Yang C, Wang XH, Bruni R, Kloss B, Zhao H, Zeng Y, Zhang FB, Marks AR, Hendrickson WA, Chen YH Nat Commun. 2017 May 19;8:15103. doi: 10.1038/ncomms15103. PMID:28524849 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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