Computer modeling analysis for enediyne chromophore-apoprotein complex of macromolecular antitumor antibiotic C-1027

J Med Chem. 1994 Jul 22;37(15):2266-73. doi: 10.1021/jm00041a004.

Abstract

On the basis of the van der Waals and electrostatic potential energy calculations and energy minimization (EM), a model for the apoprotein-chromophore complex of C-1027 has been constructed by docking the apoprotein (Apo-C1027) and the chromophore (C1027-Chr). The model of the apoprotein-chromophore complex also suggests the most probable stereochemistry of the chromophore (8R,9S,13R,17R), specific interactions between Apo-C1027 and C1027-Chr, and the origin of the stabilization of the chromophore by the apoprotein. The acetylenic bond of C1027-Chr appears to be stabilized by (1) hydrophobic interactions with the bottom of the pocket of Apo-C1027, (2) orbital interaction with Cys36-Cys45 disulfide bond, (3) van der Waals contact with Pro76, and (4) pi-pi stacking with the benzene moiety of the chromophore. In this model, molecular dynamics (MD) simulation of the chromophore indicates that the acetylene bond distance (C2-C7) of the apoprotein-bound chromophore is longer than that of the unbound chromophore.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Aminoglycosides*
  • Anti-Bacterial Agents* / chemistry*
  • Antibiotics, Antineoplastic / chemistry*
  • Apoproteins / chemistry*
  • Binding Sites
  • Chromogenic Compounds / chemistry*
  • Computer Graphics
  • Computer Simulation
  • Enediynes
  • Molecular Sequence Data
  • Peptides*
  • Protein Conformation
  • Sequence Homology, Amino Acid

Substances

  • Aminoglycosides
  • Anti-Bacterial Agents
  • Antibiotics, Antineoplastic
  • Apoproteins
  • Chromogenic Compounds
  • Enediynes
  • Peptides
  • C 1027