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-Structure paper
タイトル | Phospho-regulation, nucleotide binding and ion access control in potassium-chloride cotransporters. |
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ジャーナル・号・ページ | EMBO J, Vol. 40, Issue 14, Page e107294, Year 2021 |
掲載日 | 2021年7月15日 |
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 / |
PubMed 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. |
リンク | EMBO J / PubMed:34031912 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.12 - 4.47 Å |
構造データ | EMDB-10704, PDB-6y5v: EMDB-11799, PDB-7ain: EMDB-11800, PDB-7aio: EMDB-11801, PDB-7aip: EMDB-11802, PDB-7aiq: EMDB-11803, PDB-7air: EMDB-11804: EMDB-11805: EMDB-12311, PDB-7ngb: |
化合物 | ChemComp-NAG: ChemComp-ATP: ChemComp-MG: ChemComp-HOH: |
由来 |
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キーワード | MEMBRANE PROTEIN / Dimer / transporter / potassium chloride / KCC3 / SLC12A6 / APC / Structural Genomics / Structural Genomics Consortium / SGC / TRANSPORT PROTEIN / CCC / human membrane protein / homodimer / KCC / potassium-chloride coupled transporter / nucleotide-binding / KCC1 |