2ONR

Crystal structure of A. fulgidus periplasmic binding protein ModA with bound molybdate

2ONR の概要

• エントリーDOI: 10.2210/pdb2onr/pdb
• 関連するPDBエントリー: 2ONS
• 分子名称: UPF0100 protein AF_0094, NITRATE ION, MAGNESIUM ION, ... (5 entities in total)
• 機能のキーワード: soluble protein, ligand binding protein
• 由来する生物種: Archaeoglobus fulgidus DSM 4304
• 細胞内の位置: Cell membrane; Peripheral membrane protein: O30142
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 36088.04

構造登録者

Hollenstein, K.,Frei, D.C.,Locher, K.P. (登録日: 2007-01-24, 公開日: 2007-03-06, 最終更新日: 2023-12-27)

主引用文献

Hollenstein, K.,Frei, D.C.,Locher, K.P.
Structure of an ABC transporter in complex with its binding protein.
Nature, 446:213-216, 2007

PubMed Abstract: ATP-binding cassette (ABC) transporter proteins carry diverse substrates across cell membranes. Whereas clinically relevant ABC exporters are implicated in various diseases or cause multidrug resistance of cancer cells, bacterial ABC importers are essential for the uptake of nutrients, including rare elements such as molybdenum. A detailed understanding of their mechanisms requires direct visualization at high resolution and in distinct conformations. Our recent structure of the multidrug ABC exporter Sav1866 has revealed an outward-facing conformation of the transmembrane domains coupled to a closed conformation of the nucleotide-binding domains, reflecting the ATP-bound state. Here we present the 3.1 A crystal structure of a putative molybdate transporter (ModB2C2) from Archaeoglobus fulgidus in complex with its binding protein (ModA). Twelve transmembrane helices of the ModB subunits provide an inward-facing conformation, with a closed gate near the external membrane boundary. The ATP-hydrolysing ModC subunits reveal a nucleotide-free, open conformation, whereas the attached binding protein aligns the substrate-binding cleft with the entrance to the presumed translocation pathway. Structural comparison of ModB2C2A with Sav1866 suggests a common alternating access and release mechanism, with binding of ATP promoting an outward-facing conformation and dissociation of the hydrolysis products promoting an inward-facing conformation.

PubMed: 17322901
DOI: 10.1038/nature05626

実験手法

X-RAY DIFFRACTION (1.6 Å)