3GN0

Crystal structure of human arginase I in complex with difluoromethylornithine (DFMO)

3GN0 の概要

• エントリーDOI: 10.2210/pdb3gn0/pdb
• 関連するPDBエントリー: 2ZAV 3GMZ
• 分子名称: Arginase-1, MANGANESE (II) ION, ALPHA-DIFLUOROMETHYLORNITHINE, ... (4 entities in total)
• 機能のキーワード: dfmo binding, polyamine biosynthesis, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm: P05089
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 70143.85

構造登録者

Di Costanzo, L.,Christianson, D.W. (登録日: 2009-03-15, 公開日: 2010-02-23, 最終更新日: 2023-09-06)

主引用文献

Ilies, M.,Di Costanzo, L.,Dowling, D.P.,Thorn, K.J.,Christianson, D.W.
Binding of alpha,alpha-Disubstituted Amino Acids to Arginase Suggests New Avenues for Inhibitor Design
J.Med.Chem., 54:5432-5443, 2011

PubMed Abstract: Arginase is a binuclear manganese metalloenzyme that hydrolyzes L-arginine to form L-ornithine and urea, and aberrant arginase activity is implicated in various diseases such as erectile dysfunction, asthma, atherosclerosis, and cerebral malaria. Accordingly, arginase inhibitors may be therapeutically useful. Continuing our efforts to expand the chemical space of arginase inhibitor design and inspired by the binding of 2-(difluoromethyl)-L-ornithine to human arginase I, we now report the first study of the binding of α,α-disubstituted amino acids to arginase. Specifically, we report the design, synthesis, and assay of racemic 2-amino-6-borono-2-methylhexanoic acid and racemic 2-amino-6-borono-2-(difluoromethyl)hexanoic acid. X-ray crystal structures of human arginase I and Plasmodium falciparum arginase complexed with these inhibitors reveal the exclusive binding of the L-stereoisomer; the additional α-substituent of each inhibitor is readily accommodated and makes new intermolecular interactions in the outer active site of each enzyme. Therefore, this work highlights a new region of the protein surface that can be targeted for additional affinity interactions, as well as the first comparative structural insights on inhibitor discrimination between a human and a parasitic arginase.

PubMed: 21728378
DOI: 10.1021/jm200443b

実験手法

X-RAY DIFFRACTION (1.7 Å)