title: Locating interaction sites on proteins: the crystal structure of thermolysin soaked in 2% to 100% isopropanol.
abstract: Multiple-solvent crystal structure determination (MSCS) allows the position and orientation of bound solvent fragments to be identified by determining the structure of protein crystals soaked in organic solvents. We have extended this technique by the determination of high-resolution crystal structures of thermolysin (TLN), generated from crystals soaked in 2% to 100% isopropanol. The procedure causes only minor changes to the conformation of the protein, and an increasing number of isopropanol interaction sites could be identified as the solvent concentration is increased. Isopropanol occupies all four of the main subsites in the active site, although this was only observed at very high concentrations of isopropanol for three of the four subsites. Analysis of the isopropanol positions shows little correlation with interaction energy computed using a molecular mechanics force field, but the experimentally determined positions of isopropanol are consistent with the structures of known protein-ligand complexes of TLN.
authors.affiliation: Department of Chemistry, University of York, Heslington, United Kingdom.
authors.forename: A C
authors.initials: AC
authors.lastname: English
authors.forename: S H
authors.initials: SH
authors.lastname: Done
authors.forename: L S
authors.initials: LS
authors.lastname: Caves
authors.forename: C R
authors.initials: CR
authors.lastname: Groom
authors.forename: R E
authors.initials: RE
authors.lastname: Hubbard
mesh_terms: D019840:2-Propanol; D001665:Binding Sites; D018360:Crystallography, X-Ray; D004121:Dimethyl Sulfoxide; D005583:Fourier Analysis; D008958:Models, Molecular; D011480:Protease Inhibitors / Q000737:chemistry; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D012997:Solvents; D055672:Static Electricity; D013816:Thermodynamics; D013820:Thermolysin / Q000037:antagonists & inhibitors / Q000737:chemistry*
chemical_list: D011480:Protease Inhibitors; D012997:Solvents; D013820:Thermolysin; D019840:2-Propanol; D004121:Dimethyl Sulfoxide