title: Unanticipated parallels in architecture and mechanism between ATP-gated P2X receptors and acid sensing ion channels.
abstract: ATP-gated P2X receptors and acid-sensing ion channels are cation-selective, trimeric ligand-gated ion channels unrelated in amino acid sequence. Nevertheless, initial crystal structures of the P2X4 receptor and acid-sensing ion channel 1a in resting/closed and in non conductive/desensitized conformations, respectively, revealed common elements of architecture. Recent structures of both channels have revealed the ion channels in open conformations. Here we focus on common elements of architecture, conformational change and ion permeation, emphasizing general principles of structure and mechanism in P2X receptors and in acid-sensing ion channels and showing how these two sequence-disparate families of ligand-gated ion channel harbor unexpected similarities when viewed through a structural lens.
authors.affiliation: Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Baconguis
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Hattori
authors.forename: Eric
authors.initials: E
authors.lastname: Gouaux
mesh_terms: D062565:Acid Sensing Ion Channels / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D015640:Ion Channel Gating; D007477:Ions / Q000737:chemistry / Q000378:metabolism; D008958:Models, Molecular; D011485:Protein Binding; D011487:Protein Conformation; D021122:Protein Subunits / Q000737:chemistry; D058911:Purinergic P2X Receptor Agonists / Q000737:chemistry / Q000378:metabolism; D058469:Receptors, Purinergic P2X / Q000737:chemistry* / Q000378:metabolism; D062687:Sodium Channel Agonists / Q000737:chemistry / Q000378:metabolism
chemical_list: D062565:Acid Sensing Ion Channels; D007477:Ions; D021122:Protein Subunits; D058911:Purinergic P2X Receptor Agonists; D058469:Receptors, Purinergic P2X; D062687:Sodium Channel Agonists