negative regulation of zinc ion transmembrane import / glutamatergic postsynaptic density / zinc export across plasma membrane / detoxification of zinc ion / zinc ion import into organelle / detoxification of cadmium ion / zinc:proton antiporter activity / Zinc efflux and compartmentalization by the SLC30 family / cadmium ion transmembrane transport / negative regulation of calcium ion import ...negative regulation of zinc ion transmembrane import / glutamatergic postsynaptic density / zinc export across plasma membrane / detoxification of zinc ion / zinc ion import into organelle / detoxification of cadmium ion / zinc:proton antiporter activity / Zinc efflux and compartmentalization by the SLC30 family / cadmium ion transmembrane transport / negative regulation of calcium ion import / regulation of postsynaptic density protein 95 clustering / zinc ion transport / zinc ion transmembrane transporter activity / negative regulation of neurotransmitter secretion / zinc ion transmembrane transport / positive regulation of dendritic spine morphogenesis / intracellular zinc ion homeostasis / calcium ion import / postsynaptic density, intracellular component / calcium channel inhibitor activity / T-tubule / cytoplasmic vesicle membrane / postsynaptic density membrane / Schaffer collateral - CA1 synapse / intracellular calcium ion homeostasis / nuclear membrane / basolateral plasma membrane / in utero embryonic development / defense response to bacterium / Golgi membrane / dendrite / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / metal ion binding / membrane / plasma membrane / cytoplasm 類似検索 - 分子機能
ジャーナル: Sci Adv / 年: 2024 タイトル: Structural insights into the calcium-coupled zinc export of human ZnT1. 著者: Chunqiao Sun / Bangguo He / Yongxiang Gao / Xingbing Wang / Xin Liu / Linfeng Sun / 要旨: Cellular zinc (Zn) homeostasis is essential to human health and is under tight regulations. Human zinc transporter 1 (hZnT1) is a plasma membrane-localized Zn exporter belonging to the ZnT family, ...Cellular zinc (Zn) homeostasis is essential to human health and is under tight regulations. Human zinc transporter 1 (hZnT1) is a plasma membrane-localized Zn exporter belonging to the ZnT family, and its functional aberration is associated with multiple diseases. Here, we show that hZnT1 works as a Zn/Ca exchanger. We determine the structure of hZnT1 using cryo-electron microscopy (cryo-EM) single particle analysis. hZnT1 adopts a homodimeric structure, and each subunit contains a transmembrane domain consisting of six transmembrane segments, a cytosolic domain, and an extracellular domain. The transmembrane region displays an outward-facing conformation. On the basis of structural and functional analysis, we propose a model for the hZnT1-mediated Zn/Ca exchange. Together, these results facilitate our understanding of the biological functions of hZnT1 and provide a basis for further investigations of the ZnT family transporters.