- PDB-7aiq: Structure of Human Potassium Chloride Transporter KCC1 in NaCl (S... -
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基本情報
登録情報
データベース: PDB / ID: 7aiq
タイトル
Structure of Human Potassium Chloride Transporter KCC1 in NaCl (Subclass 1)
要素
Solute carrier family 12 member 4
キーワード
TRANSPORT PROTEIN / CCC / transporter / human membrane protein / homodimer / nucleotide-binding / KCC1 / KCC / potassium-chloride coupled transporter / Structural Genomics / Structural Genomics Consortium / SGC
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 / chloride transmembrane transport / chemical synaptic transmission ...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 / chloride transmembrane transport / chemical synaptic transmission / lysosomal membrane / synapse / protein kinase binding / ATP binding / membrane / plasma membrane 類似検索 - 分子機能
ジャーナル: EMBO J / 年: 2021 タイトル: Phospho-regulation, nucleotide binding and ion access control in potassium-chloride cotransporters. 著者: Gamma Chi / Rebecca Ebenhoch / Henry Man / Haiping Tang / Laurence E Tremblay / Gabriella Reggiano / Xingyu Qiu / Tina Bohstedt / Idlir Liko / Fernando G Almeida / Alexandre P Garneau / Dong ...著者: Gamma Chi / Rebecca Ebenhoch / Henry Man / Haiping Tang / Laurence E Tremblay / Gabriella Reggiano / Xingyu Qiu / Tina Bohstedt / Idlir Liko / Fernando G Almeida / Alexandre P Garneau / Dong Wang / Gavin McKinley / Christophe P Moreau / Kiran D Bountra / Patrizia Abrusci / Shubhashish M M Mukhopadhyay / Alejandra Fernandez-Cid / Samira Slimani / Julie L Lavoie / Nicola A Burgess-Brown / Ben Tehan / Frank DiMaio / Ali Jazayeri / Paul Isenring / Carol V Robinson / Katharina L Dürr / 要旨: Potassium-coupled chloride transporters (KCCs) play crucial roles in regulating cell volume and intracellular chloride concentration. They are characteristically inhibited under isotonic conditions ...Potassium-coupled chloride transporters (KCCs) play crucial roles in regulating cell volume and intracellular chloride concentration. They are characteristically inhibited under isotonic conditions via phospho-regulatory sites located within the cytoplasmic termini. Decreased inhibitory phosphorylation in response to hypotonic cell swelling stimulates transport activity, and dysfunction of this regulatory process has been associated with various human diseases. Here, we present cryo-EM structures of human KCC3b and KCC1, revealing structural determinants for phospho-regulation in both N- and C-termini. We show that phospho-mimetic KCC3b is arrested in an inward-facing state in which intracellular ion access is blocked by extensive contacts with the N-terminus. In another mutant with increased isotonic transport activity, KCC1Δ19, this interdomain interaction is absent, likely due to a unique phospho-regulatory site in the KCC1 N-terminus. Furthermore, we map additional phosphorylation sites as well as a previously unknown ATP/ADP-binding pocket in the large C-terminal domain and show enhanced thermal stabilization of other CCCs by adenine nucleotides. These findings provide fundamentally new insights into the complex regulation of KCCs and may unlock innovative strategies for drug development.