- EMDB-26115: Human potassium-chloride cotransporter 1 in inward-open state -
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基本情報
登録情報
データベース: EMDB / ID: EMD-26115
タイトル
Human potassium-chloride cotransporter 1 in inward-open state
マップデータ
試料
複合体: Human Potassium-chloride cotransporter 1
タンパク質・ペプチド: Solute carrier family 12 member 4
リガンド: POTASSIUM ION
キーワード
SLC12A4 / Potassium-chloride transport / Inward-open state / TRANSPORT PROTEIN
機能・相同性
機能・相同性情報
potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane / monoatomic ion transport / potassium ion transmembrane transport / protein serine/threonine kinase binding / chloride transmembrane transport ...potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane / monoatomic ion transport / potassium ion transmembrane transport / protein serine/threonine kinase binding / chloride transmembrane transport / chemical synaptic transmission / lysosomal membrane / synapse / ATP binding / membrane / plasma membrane 類似検索 - 分子機能
ジャーナル: Proc Natl Acad Sci U S A / 年: 2022 タイトル: Structure of the human cation-chloride cotransport KCC1 in an outward-open state. 著者: Yongxiang Zhao / Jiemin Shen / Qinzhe Wang / Manuel Jose Ruiz Munevar / Pietro Vidossich / Marco De Vivo / Ming Zhou / Erhu Cao / 要旨: Cation-chloride cotransporters (CCCs) catalyze electroneutral symport of Cl with Na and/or K across membranes. CCCs are fundamental in cell volume homeostasis, transepithelia ion movement, ...Cation-chloride cotransporters (CCCs) catalyze electroneutral symport of Cl with Na and/or K across membranes. CCCs are fundamental in cell volume homeostasis, transepithelia ion movement, maintenance of intracellular Cl concentration, and neuronal excitability. Here, we present a cryoelectron microscopy structure of human K-Cl cotransporter (KCC)1 bound with the VU0463271 inhibitor in an outward-open state. In contrast to many other amino acid-polyamine-organocation transporter cousins, our first outward-open CCC structure reveals that opening the KCC1 extracellular ion permeation path does not involve hinge-bending motions of the transmembrane (TM) 1 and TM6 half-helices. Instead, rocking of TM3 and TM8, together with displacements of TM4, TM9, and a conserved intracellular loop 1 helix, underlie alternate opening and closing of extracellular and cytoplasmic vestibules. We show that KCC1 intriguingly exists in one of two distinct dimeric states via different intersubunit interfaces. Our studies provide a blueprint for understanding the mechanisms of CCCs and their inhibition by small molecule compounds.