Locating interaction sites on proteins: The crystal structure of thermolysin soaked in 2% to 100% isopropanol

A C English, S H Done, L S D Caves, C R Groom, R E Hubbard

Research output: Contribution to journalArticlepeer-review

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, Proteins 1999;37:628-640, (C) 1999 Wiley-Liss, Inc.

Original languageEnglish
Pages (from-to)628-640
Number of pages13
JournalProteins - Structure Function and Genetics
Volume37
Issue number4
Publication statusPublished - 1 Dec 1999

Keywords

  • organic solvent
  • binding sites
  • drug design
  • X-ray crystallography
  • inhibitors
  • TRANSITION-STATE ANALOGS
  • BINDING-SITES
  • LIGAND INTERACTIONS
  • ORGANIC-SOLVENT
  • ZINC PEPTIDASES
  • PROGRAM
  • INHIBITORS
  • DESIGN
  • COMPLEXES
  • MOLSCRIPT

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