2GRH

M37V mutant of Scapharca dimeric hemoglobin, with CO bound

2GRH の概要

• エントリーDOI: 10.2210/pdb2grh/pdb
• 関連するPDBエントリー: 2grf 2grz 3SDH
• 分子名称: Globin-1, PROTOPORPHYRIN IX CONTAINING FE, CARBON MONOXIDE, ... (4 entities in total)
• 機能のキーワード: oxygen transport, allostery, oxygen affinity, oxygen storage-transport complex, oxygen storage/transport
• 由来する生物種: Scapharca inaequivalvis (ark clam)
• 細胞内の位置: Cytoplasm: P02213
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 33159.47

構造登録者

Knapp, J.E.,Pahl, R.,Srajer, V.,Royer Jr., W.E. (登録日: 2006-04-24, 公開日: 2006-05-09, 最終更新日: 2023-08-30)

主引用文献

Knapp, J.E.,Pahl, R.,Srajer, V.,Royer Jr., W.E.
Allosteric action in real time: Time-resolved crystallographic studies of a cooperative dimeric hemoglobin.
Proc.Natl.Acad.Sci.Usa, 103:7649-7654, 2006

PubMed Abstract: Protein allostery provides mechanisms for regulation of biological function at the molecular level. We present here an investigation of global, ligand-induced allosteric transition in a protein by time-resolved x-ray diffraction. The study provides a view of structural changes in single crystals of Scapharca dimeric hemoglobin as they proceed in real time, from 5 ns to 80 micros after ligand photodissociation. A tertiary intermediate structure forms rapidly (<5 ns) as the protein responds to the presence of an unliganded heme within each R-state protein subunit, with key structural changes observed in the heme groups, neighboring residues, and interface water molecules. This intermediate lays a foundation for the concerted tertiary and quaternary structural changes that occur on a microsecond time scale and are associated with the transition to a low-affinity T-state structure. Reversal of these changes shows a considerable lag as a T-like structure persists well after ligand rebinding, suggesting a slow T-to-R transition.

PubMed: 16684887
DOI: 10.1073/pnas.0509411103

実験手法

X-RAY DIFFRACTION (1.5 Å)