2H44

Crystal structure of PDE5A1 in complex with icarisid II

2H44 の概要

• エントリーDOI: 10.2210/pdb2h44/pdb
• 関連するPDBエントリー: 2H40 2H42
• 分子名称: cGMP-specific 3',5'-cyclic phosphodiesterase, ZINC ION, MAGNESIUM ION, ... (5 entities in total)
• 機能のキーワード: icarisid ii, flavonoid, pde5a inhibitor, hydrolase
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 38394.78

構造登録者

Wang, H.,Ke, H. (登録日: 2006-05-23, 公開日: 2006-06-06, 最終更新日: 2023-08-30)

主引用文献

Wang, H.,Liu, Y.,Huai, Q.,Cai, J.,Zoraghi, R.,Francis, S.H.,Corbin, J.D.,Robinson, H.,Xin, Z.,Lin, G.,Ke, H.
Multiple Conformations of Phosphodiesterase-5: Implications for enzyme function and drug development
J.Biol.Chem., 281:21469-21479, 2006

PubMed Abstract: Phosphodiesterase-5 (PDE5) is the target for sildenafil, vardenafil, and tadalafil, which are drugs for treatment of erectile dysfunction and pulmonary hypertension. We report here the crystal structures of a fully active catalytic domain of unliganded PDE5A1 and its complexes with sildenafil or icarisid II. These structures together with the PDE5A1-isobutyl-1-methylxanthine complex show that the H-loop (residues 660-683) at the active site of PDE5A1 has four different conformations and migrates 7-35A upon inhibitor binding. In addition, the conformation of sildenafil reported herein differs significantly from those in the previous structures of chimerically hybridized or almost inactive PDE5. Mutagenesis and kinetic analyses confirm that the H-loop is particularly important for substrate recognition and that invariant Gly(659), which immediately precedes the H-loop, is critical for optimal substrate affinity and catalytic activity.

PubMed: 16735511
DOI: 10.1074/jbc.M512527200

実験手法

X-RAY DIFFRACTION (1.8 Å)