1HT5

THE 2.75 ANGSTROM RESOLUTION MODEL OF OVINE COX-1 COMPLEXED WITH METHYL ESTER FLURBIPROFEN

1HT5 の概要

• エントリーDOI: 10.2210/pdb1ht5/pdb
• 関連するPDBエントリー: 1EQH
• 分子名称: PROSTAGLANDIN H2 SYNTHASE-1, octyl beta-D-glucopyranoside, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• 機能のキーワード: membrane protein, peroxidase, dioxygenase, oxidoreductase
• 由来する生物種: Ovis aries (sheep)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 131862.61

構造登録者

Selinsky, B.S.,Gupta, K.,Sharkey, C.T.,Loll, P.J. (登録日: 2000-12-28, 公開日: 2001-04-11, 最終更新日: 2024-11-20)

主引用文献

Selinsky, B.S.,Gupta, K.,Sharkey, C.T.,Loll, P.J.
Structural analysis of NSAID binding by prostaglandin H2 synthase: time-dependent and time-independent inhibitors elicit identical enzyme conformations.
Biochemistry, 40:5172-5180, 2001

PubMed Abstract: Nonsteroidal antiinflammatory drugs (NSAIDs) block prostanoid biosynthesis by inhibiting prostaglandin H(2) synthase (EC 1.14.99.1). NSAIDs are either rapidly reversible competitive inhibitors or slow tight-binding inhibitors of this enzyme. These different modes of inhibition correlate with clinically important differences in isoform selectivity. Hypotheses have been advanced to explain the different inhibition kinetics, but no structural data have been available to test them. We present here crystal structures of prostaglandin H(2) synthase-1 in complex with the inhibitors ibuprofen, methyl flurbiprofen, flurbiprofen, and alclofenac at resolutions ranging from 2.6 to 2.75 A. These structures allow direct comparison of enzyme complexes with reversible competitive inhibitors (ibuprofen and methyl flurbiprofen) and slow tight-binding inhibitors (alclofenac and flurbiprofen). The four inhibitors bind to the same site and adopt similar conformations. In all four complexes, the enzyme structure is essentially unchanged, exhibiting only minimal differences in the inhibitor binding site. These results argue strongly against hypotheses that explain the difference between slow tight-binding and fast reversible competitive inhibition by invoking global conformational differences or different inhibitor binding sites. Instead, they suggest that the different apparent modes of NSAID binding may result from differences in the speed and efficiency with which inhibitors can perturb the hydrogen bonding network around Arg-120 and Tyr-355.

PubMed: 11318639
DOI: 10.1021/bi010045s

実験手法

X-RAY DIFFRACTION (2.75 Å)