The crystallographic structure of the aldose reductase-IDD552 complex shows direct proton donation from tyrosine 48.
Ruiz, F., Hazemann, I., Mitschler, A., Joachimiak, A., Schneider, T., Karplus, M., Podjarny, A.(2004) Acta Crystallogr D Biol Crystallogr 60: 1347-1354
- PubMed: 15272156 
- DOI: 10.1107/S0907444904011370
- Primary Citation of Related Structures:  
1T40, 1T41 - PubMed Abstract: 
The X-ray crystal structure of human aldose reductase (ALR2) in complex with the inhibitor IDD552 was determined using crystals obtained from two crystallization conditions with different pH values (pH 5 and 8). In both structures the charged carboxylic head of the inhibitor binds to the active site, making hydrogen-bond interactions with His110 and Tyr48 and electrostatic interactions with NADP+ ...