+検索条件
-Structure paper
タイトル | Structure and mechanism of the human NHE1-CHP1 complex. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 3474, Year 2021 |
掲載日 | 2021年6月9日 |
著者 | Yanli Dong / Yiwei Gao / Alina Ilie / DuSik Kim / Annie Boucher / Bin Li / Xuejun C Zhang / John Orlowski / Yan Zhao / |
PubMed 要旨 | Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and ...Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and volume homeostasis. Calcineurin B-homologous protein 1 (CHP1) is an obligate binding partner that promotes NHE1 biosynthetic maturation, cell surface expression and pH-sensitivity. Dysfunctions of either protein are associated with neurological disorders. Here, we elucidate structures of the human NHE1-CHP1 complex in both inward- and inhibitor (cariporide)-bound outward-facing conformations. We find that NHE1 assembles as a symmetrical homodimer, with each subunit undergoing an elevator-like conformational change during cation exchange. The cryo-EM map reveals the binding site for the NHE1 inhibitor cariporide, illustrating how inhibitors block transport activity. The CHP1 molecule differentially associates with these two conformational states of each NHE1 monomer, and this association difference probably underlies the regulation of NHE1 pH-sensitivity by CHP1. |
リンク | Nat Commun / PubMed:34108458 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.3 - 3.5 Å |
構造データ | EMDB-30847, PDB-7dsv: EMDB-30848, PDB-7dsw: EMDB-30849, PDB-7dsx: |
化合物 | ChemComp-LBN: ChemComp-PGT: ChemComp-HG0: |
由来 |
|
キーワード | MEMBRANE PROTEIN / Transporter |