1M78

CANDIDA ALBICANS DIHYDROFOLATE REDUCTASE COMPLEXED WITH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE (NADPH) AND 5-CHLORYL-2,4,6-QUINAZOLINETRIAMINE (GW1225)

1M78 の概要

• エントリーDOI: 10.2210/pdb1m78/pdb
• 関連するPDBエントリー: 1AI9 1AOE 1IA1 1IA2 1IA3 1IA4 1M79 1M7A
• 分子名称: DIHYDROFOLATE REDUCTASE, NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE, 5-CHLORYL-2,4,6-QUINAZOLINETRIAMINE, ... (4 entities in total)
• 機能のキーワード: oxidoreductase, antifungal target, reductase
• 由来する生物種: Candida albicans
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 46299.17

構造登録者

Whitlow, M.,Howard, A.J.,Kuyper, L.F. (登録日: 2002-07-19, 公開日: 2003-03-04, 最終更新日: 2023-08-23)

主引用文献

Whitlow, M.,Howard, A.J.,Stewart, D.,Hardman, K.D.,Kuyper, L.F.,Baccanari, D.P.,Fling, M.E.,Tansik, R.L.
X-Ray Crystallographic Studies of Candida Albicans Dihydrofolate Reductase. High Resolution Structures of the Holoenzyme and an Inhibited Ternary Complex.
J.Biol.Chem., 272:30289-30298, 1997

PubMed Abstract: The recent rise in systemic fungal infections has created a need for the development of new antifungal agents. As part of an effort to provide therapeutically effective inhibitors of fungal dihydrofolate reductase (DHFR), we have cloned, expressed, purified, crystallized, and determined the three-dimensional structure of Candida albicans DHFR. The 192-residue enzyme, which was expressed in Escherichia coli and purified by methotrexate affinity and cation exchange chromatography, was 27% identical to human DHFR. Crystals of C. albicans DHFR were grown as the holoenzyme complex and as a ternary complex containing a pyrroloquinazoline inhibitor. Both complexes crystallized with two molecules in the asymmetric unit in space group P21. The final structures had R-factors of 0.199 at 1.85-A resolution and 0.155 at 1.60-A resolution, respectively. The enzyme fold was similar to that of bacterial and vertebrate DHFR, and the binding of a nonselective diaminopyrroloquinazoline inhibitor and the interactions of NADPH with protein were typical of ligand binding to other DHFRs. However, the width of the active site cleft of C. albicans DHFR was significantly larger than that of the human enzyme, providing a basis for the design of potentially selective inhibitors.

PubMed: 9374515
DOI: 10.1074/jbc.272.48.30289

実験手法

X-RAY DIFFRACTION (1.71 Å)