5mnz Citations

Intriguing role of water in protein-ligand binding studied by neutron crystallography on trypsin complexes.

Abstract

Hydrogen bonds are key interactions determining protein-ligand binding affinity and therefore fundamental to any biological process. Unfortunately, explicit structural information about hydrogen positions and thus H-bonds in protein-ligand complexes is extremely rare and similarly the important role of water during binding remains poorly understood. Here, we report on neutron structures of trypsin determined at very high resolutions ≤1.5 Å in uncomplexed and inhibited state complemented by X-ray and thermodynamic data and computer simulations. Our structures show the precise geometry of H-bonds between protein and the inhibitors N-amidinopiperidine and benzamidine along with the dynamics of the residual solvation pattern. Prior to binding, the ligand-free binding pocket is occupied by water molecules characterized by a paucity of H-bonds and high mobility resulting in an imperfect hydration of the critical residue Asp189. This phenomenon likely constitutes a key factor fueling ligand binding via water displacement and helps improving our current view on water influencing protein-ligand recognition.

Articles - 5mnz mentioned but not cited (1)

  1. Neutron crystallographic refinement with REFMAC5 from the CCP4 suite. Catapano L, Long F, Yamashita K, Nicholls RA, Steiner RA, Murshudov GN. Acta Crystallogr D Struct Biol 79 1056-1070 (2023)


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