- PDB-6xpd: Cryo-EM structure of human ZnT8 double mutant - D110N and D224N, ... -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: PDB / ID: 6xpd
タイトル
Cryo-EM structure of human ZnT8 double mutant - D110N and D224N, determined in outward-facing conformation
要素
Zinc transporter 8
キーワード
TRANSPORT PROTEIN / ZnT8 / zinc transporter
機能・相同性
機能・相同性情報
Zinc efflux and compartmentalization by the SLC30 family / zinc ion import into organelle / zinc:proton antiporter activity / zinc ion import across plasma membrane / insulin processing / zinc ion transmembrane transporter activity / zinc ion transport / zinc ion transmembrane transport / regulation of vesicle-mediated transport / intracellular zinc ion homeostasis ...Zinc efflux and compartmentalization by the SLC30 family / zinc ion import into organelle / zinc:proton antiporter activity / zinc ion import across plasma membrane / insulin processing / zinc ion transmembrane transporter activity / zinc ion transport / zinc ion transmembrane transport / regulation of vesicle-mediated transport / intracellular zinc ion homeostasis / insulin secretion / transport vesicle membrane / response to zinc ion / Insulin processing / response to type II interferon / response to glucose / response to interleukin-1 / secretory granule membrane / secretory granule / positive regulation of insulin secretion / cytoplasmic vesicle / Golgi membrane / intracellular membrane-bounded organelle / protein homodimerization activity / zinc ion binding / plasma membrane 類似検索 - 分子機能
ジャーナル: Elife / 年: 2020 タイトル: Cryo-EM structures of human ZnT8 in both outward- and inward-facing conformations. 著者: Jing Xue / Tian Xie / Weizhong Zeng / Youxing Jiang / Xiao-Chen Bai / 要旨: ZnT8 is a Zn/H antiporter that belongs to SLC30 family and plays an essential role in regulating Zn accumulation in the insulin secretory granules of pancreatic β cells. However, the Zn/H exchange ...ZnT8 is a Zn/H antiporter that belongs to SLC30 family and plays an essential role in regulating Zn accumulation in the insulin secretory granules of pancreatic β cells. However, the Zn/H exchange mechanism of ZnT8 remains unclear due to the lack of high-resolution structures. Here, we report the cryo-EM structures of human ZnT8 (HsZnT8) in both outward- and inward-facing conformations. HsZnT8 forms a dimeric structure with four Zn binding sites within each subunit: a highly conserved primary site in transmembrane domain (TMD) housing the Zn substrate; an interfacial site between TMD and C-terminal domain (CTD) that modulates the Zn transport activity of HsZnT8; and two adjacent sites buried in the cytosolic domain and chelated by conserved residues from CTD and the His-Cys-His (HCH) motif from the N-terminal segment of the neighboring subunit. A comparison of the outward- and inward-facing structures reveals that the TMD of each HsZnT8 subunit undergoes a large structural rearrangement, allowing for alternating access to the primary Zn site during the transport cycle. Collectively, our studies provide the structural insights into the Zn/H exchange mechanism of HsZnT8.