4RT6

Structure of a complex between hemopexin and hemopexin binding protein

4RT6 の概要

• エントリーDOI: 10.2210/pdb4rt6/pdb
• 関連するPDBエントリー: 1QHU 1QJS 4I84 4RM6
• 分子名称: Heme/hemopexin-binding protein, Hemopexin, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (4 entities in total)
• 機能のキーワード: beta-helix; beta-propeller domain, interaction of hxua with hemopexin enables heme release from hemopexin, outer membrane, protein binding
• 由来する生物種: Haemophilus influenzae Rd KW20; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 121488.15

構造登録者

Zambolin, S.,Clantin, B.,Haouz, A.,Villeret, V.,Delepelaire, P. (登録日: 2014-11-13, 公開日: 2016-05-18, 最終更新日: 2024-10-30)

主引用文献

Zambolin, S.,Clantin, B.,Chami, M.,Hoos, S.,Haouz, A.,Villeret, V.,Delepelaire, P.
Structural basis for haem piracy from host haemopexin by Haemophilus influenzae.
Nat Commun, 7:11590-11590, 2016

PubMed Abstract: Haemophilus influenzae is an obligate human commensal/pathogen that requires haem for survival and can acquire it from several host haemoproteins, including haemopexin. The haem transport system from haem-haemopexin consists of HxuC, a haem receptor, and the two-partner-secretion system HxuB/HxuA. HxuA, which is exposed at the cell surface, is strictly required for haem acquisition from haemopexin. HxuA forms complexes with haem-haemopexin, leading to haem release and its capture by HxuC. The key question is how HxuA liberates haem from haemopexin. Here, we solve crystal structures of HxuA alone, and HxuA in complex with the N-terminal domain of haemopexin. A rational basis for the release of haem from haem-haemopexin is derived from both in vivo and in vitro studies. HxuA acts as a wedge that destabilizes the two-domains structure of haemopexin with a mobile loop on HxuA that favours haem ejection by redirecting key residues in the haem-binding pocket of haemopexin.

PubMed: 27188378
DOI: 10.1038/ncomms11590

実験手法

X-RAY DIFFRACTION (2.8 Å)