6F81

AKR1B1 at 0.75 MGy radiation dose.

6F81 の概要

• エントリーDOI: 10.2210/pdb6f81/pdb
• 関連するPDBエントリー: 6F7R 6F81 6F82 6F84 6F8O
• 分子名称: Aldose reductase, NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE, CITRIC ACID, ... (4 entities in total)
• 機能のキーワード: oxidative stress, radiation damage, diabetes, non-genetic mutation, oxidoreductase
• 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: 37025.99

構造登録者

Castellvi, A.,Juanhuix, J. (登録日: 2017-12-12, 公開日: 2019-03-13, 最終更新日: 2024-01-17)

主引用文献

Castellvi, A.,Crespo, I.,Crosas, E.,Camara-Artigas, A.,Gavira, J.A.,Aranda, M.A.G.,Pares, X.,Farres, J.,Juanhuix, J.
Efficacy of aldose reductase inhibitors is affected by oxidative stress induced under X-ray irradiation.
Sci Rep, 9:3177-3177, 2019

PubMed Abstract: Human aldose reductase (hAR, AKR1B1) has been explored as drug target since the 1980s for its implication in diabetic complications. An activated form of hAR was found in cells from diabetic patients, showing a reduced sensitivity to inhibitors in clinical trials, which may prevent its pharmacological use. Here we report the conversion of native hAR to its activated form by X-ray irradiation simulating oxidative stress conditions. Upon irradiation, the enzyme activity increases moderately and the potency of several hAR inhibitors decay before global protein radiation damage appears. The catalytic behavior of activated hAR is also reproduced as the K increases dramatically while the k is not much affected. Consistently, the catalytic tetrad is not showing any modification. The only catalytically-relevant structural difference observed is the conversion of residue Cys298 to serine and alanine. A mechanism involving electron capture is suggested for the hAR activation. We propose that hAR inhibitors should not be designed against the native protein but against the activated form as obtained from X-ray irradiation. Furthermore, since the reactive species produced under irradiation conditions are the same as those produced under oxidative stress, the described irradiation method can be applied to other relevant proteins under oxidative stress environments.

PubMed: 30816220
DOI: 10.1038/s41598-019-39722-0

実験手法

X-RAY DIFFRACTION (0.97 Å)