3LD5

Human aldose reductase mutant T113S complexed with IDD594

3LD5 の概要

• エントリーDOI: 10.2210/pdb3ld5/pdb
• 関連するPDBエントリー: 1US0 3LBO 3LEP 3LQG 3LQL 3LZ3 3LZ5 3M4H
• 分子名称: Aldose reductase, NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE, IDD594, ... (6 entities in total)
• 機能のキーワード: tim barrel, t113s mutant, oxidoreductase, nadp, phosphoprotein, oxidoreductase-oxidoreductase inhibitor complex, oxidoreductase/oxidoreductase inhibitor
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm: P15121
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 37315.98

構造登録者

Koch, C.,Heine, A.,Klebe, G. (登録日: 2010-01-12, 公開日: 2010-12-15, 最終更新日: 2024-03-20)

主引用文献

Koch, C.,Heine, A.,Klebe, G.
Tracing the detail: how mutations affect binding modes and thermodynamic signatures of closely related aldose reductase inhibitors
J.Mol.Biol., 406:700-712, 2011

PubMed Abstract: Improvements on the computational methods for affinity prediction from the structure of protein-ligand complexes require a better understanding of the nature of molecular interactions and biomolecular recognition principles. In the present contribution, the binding of two chemically closely related human aldose reductase inhibitors had been studied by high-resolution X-ray analysis (0.92-1.35 Ǻ) and isothermal titration calorimetry against a series of single-site mutants of the wild-type protein. A crucial threonine thought to be involved in a short bromine-to-oxygen halogen bond to the inhibitors in the wild type has been mutated to the structurally similar residues alanine, cysteine, serine and valine. Overall, structurally, the binding mode of the inhibitors is conserved; however, small but significant geometrical adaptations are observed as a consequence of the spatial and electronic changes at the mutation site. They involve the opening of a central bond angle and shifts in consequence of the lost or gained halogen bonds. Remarkably, the tiny structural changes are responded by partly strong modulation of the thermodynamic profiles. Even though the free energy of binding is maximally perturbed by only 7 kJ/mol, much stronger modulations and shifts in the enthalpy and entropy signatures are revealed, which indicate a pronounced enthalpy/entropy compensation. However, an explanatory correlation can be detected when facing these perturbances against the small structural changes. This also provides deeper insights into how single-site mutations can alter the selectivity profile of closely related ligands against a target protein.

PubMed: 21185307
DOI: 10.1016/j.jmb.2010.11.058

実験手法

X-RAY DIFFRACTION (1.27 Å)