6whg
From Proteopedia
PI3P and calcium bound full-length TRPY1 in detergent
Structural highlights
Function[YVC1_YEAST] Required for release of calcium ions from the vacuole in response to hyperosmotic shock.[1] [2] Publication Abstract from PubMedTransient receptor potential (TRP) channels emerged in fungi as mechanosensitive osmoregulators. The Saccharomyces cerevisiae vacuolar TRP yeast 1 (TRPY1) is the most studied TRP channel from fungi, but the structure and details of channel modulation remain elusive. Here, we describe the full-length cryoelectron microscopy structure of TRPY1 at 3.1 A resolution in a closed state. The structure, despite containing an evolutionarily conserved and archetypical transmembrane domain, reveals distinctive structural folds for the cytosolic N and C termini, compared with other eukaryotic TRP channels. We identify an inhibitory phosphatidylinositol 3-phosphate (PI(3)P) lipid-binding site, along with two Ca(2+)-binding sites: a cytosolic site, implicated in channel activation and a vacuolar lumen site, implicated in inhibition. These findings, together with data from microsecond-long molecular dynamics simulations and a model of a TRPY1 open state, provide insights into the basis of TRPY1 channel modulation by lipids and Ca(2+), and the molecular evolution of TRP channels. Structure of the ancient TRPY1 channel from Saccharomyces cerevisiae reveals mechanisms of modulation by lipids and calcium.,Ahmed T, Nisler CR, Fluck EC 3rd, Walujkar S, Sotomayor M, Moiseenkova-Bell VY Structure. 2021 Aug 24. pii: S0969-2126(21)00298-7. doi:, 10.1016/j.str.2021.08.003. PMID:34453887[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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