Charges Shift Protonation: Neutron Diffraction Reveals that Aniline and 2-Aminopyridine Become Protonated Upon Binding to Trypsin.
Schiebel, J., Gaspari, R., Sandner, A., Ngo, K., Gerber, H.D., Cavalli, A., Ostermann, A., Heine, A., Klebe, G.(2017) Angew Chem Int Ed Engl 56: 4887-4890
- PubMed: 28371253 
- DOI: 10.1002/anie.201701038
- Primary Citation of Related Structures:  
5MN1, 5MNA, 5MNB, 5MNC, 5MNX, 5MNY, 5MON, 5MOO - PubMed Abstract: 
Hydrogen atoms play a key role in protein-ligand recognition. They determine the quality of established H-bonding networks and define the protonation of bound ligands. Structural visualization of H atoms by X-ray crystallography is rarely possible. We used neutron diffraction to determine the positions of the hydrogen atoms in the ligands aniline and 2-aminopyridine bound to the archetypical serine protease trypsin ...