1UMP

GEOMETRY OF TRITERPENE CONVERSION TO PENTACARBOCYCLIC HOPENE

1UMP の概要

• エントリーDOI: 10.2210/pdb1ump/pdb
• 関連するPDBエントリー: 1GSZ 1H35 1H36 1H37 1H39 1H3A 1H3B 1H3C 1O6H 1O6Q 1O6R 1O79 1SQC 2SQC 3SQC
• 分子名称: SQUALENE--HOPENE CYCLASE, (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE, 2-AZASQUALENE, ... (4 entities in total)
• 機能のキーワード: isomerase, triterpene cyclase, cholesterol biosynthesis, oxidosqualene cyclase, monotopic membrane protein
• 由来する生物種: ALICYCLOBACILLUS ACIDOCALDARIUS (ALICYCLOBACILLUS ACIDOCALDARIUS)
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 217723.47

構造登録者

Reinert, D.J.,Balliano, G.,Schulz, G.E. (登録日: 2003-08-27, 公開日: 2004-02-03, 最終更新日: 2023-12-13)

主引用文献

Reinert, D.J.,Balliano, G.,Schulz, G.E.
Conversion of Squalene to the Pentacarbocyclic Hopene
Chem.Biol., 11:121-, 2004

PubMed Abstract: The membrane protein squalene-hopene cyclase was cocrystallized with 2-azasqualene and analyzed by X-ray diffraction to 2.13 A resolution. The conformation of this close analog was clearly established, and it agreed with the common textbook presentation. The bound squalene undergoes only small conformational changes during the formation of rings A through D, thus requiring no intermediate. However, ring E formation is hindered by an entropic barrier, which may explain its absence in the steroids. The structure analysis revealed a mobile region between the active center cavity and the membrane, which may melt, opening a passage for squalene and hopene.

PubMed: 15113001
DOI: 10.1016/J.CHEMBIOL.2003.12.013

実験手法

X-RAY DIFFRACTION (2.13 Å)