2NWX

Crystal structure of GltPh in complex with L-aspartate and sodium ions

2NWX の概要

• エントリーDOI: 10.2210/pdb2nwx/pdb
• 関連するPDBエントリー: 1xhf
• 分子名称: 425aa long hypothetical proton glutamate symport protein, SODIUM ION, ASPARTIC ACID, ... (5 entities in total)
• 機能のキーワード: amino acid transporter, transmembrane transporter, aspartate transporter, binding site, sodium binding, substrate binding, transport protein
• 由来する生物種: Pyrococcus horikoshii
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 135232.36

構造登録者

Gouaux, E.,Boudker, O.,Ryan, R.,Yernool, D.,Shimamoto, K. (登録日: 2006-11-16, 公開日: 2007-02-27, 最終更新日: 2023-08-30)

主引用文献

Boudker, O.,Ryan, R.M.,Yernool, D.,Shimamoto, K.,Gouaux, E.
Coupling substrate and ion binding to extracellular gate of a sodium-dependent aspartate transporter.
Nature, 445:387-393, 2007

PubMed Abstract: Secondary transporters are integral membrane proteins that catalyse the movement of substrate molecules across the lipid bilayer by coupling substrate transport to one or more ion gradients, thereby providing a mechanism for the concentrative uptake of substrates. Here we describe crystallographic and thermodynamic studies of Glt(Ph), a sodium (Na+)-coupled aspartate transporter, defining sites for aspartate, two sodium ions and d,l-threo-beta-benzyloxyaspartate, an inhibitor. We further show that helical hairpin 2 is the extracellular gate that controls access of substrate and ions to the internal binding sites. At least two sodium ions bind in close proximity to the substrate and these sodium-binding sites, together with the sodium-binding sites in another sodium-coupled transporter, LeuT, define an unwound alpha-helix as the central element of the ion-binding motif, a motif well suited to the binding of sodium and to participation in conformational changes that accompany ion binding and unbinding during the transport cycle.

PubMed: 17230192
DOI: 10.1038/nature05455

実験手法

X-RAY DIFFRACTION (3.29 Å)