MTD-PLS: a PLS variant of the minimal topologic difference method. III. Mapping interactions between estradiol derivatives and the alpha estrogenic receptor. Academic Article uri icon

start page

  • 1275

end page

  • 1281


  • A homogeneous collection of 45 estrogen agonist derivatives with relative binding affinities measured to the estrogen receptor from Ratus norvegicus was used. The quantitative structure-activity relationships were derived using an improved minimal topologic difference (MTD) method in a partial least-squares (PLS) variant. The spatially assigned analysis of fragment properties can provide receptor site maps, within the limits of the existing series. A steric misfit was found for the steroidal position 2; benefic hydrophobic and van der Waals (enhanced by high polarizability) interactions were found for the 17alpha-CH=CH-X group. MTD-PLS mapping results are confirmed by the experimentally derived estradiol-estrogen receptor binding site contacts (based on X-ray crystallography). Our results suggest that this MTD-PLS method can yield useful results for interactions with receptors of unknown 3D structure and, generally, for the steric rigidity of receptor sites.

Digital Object Identifier (DOI)

  • 10.1021/ci050077c

PubMed Identifier

  • 16180904


  • 45


  • 5


  • Algorithms
  • Animals
  • Binding Sites
  • Crystallography, X-Ray
  • Estradiol
  • Estrogen Receptor alpha
  • Hydrophobic and Hydrophilic Interactions
  • Models, Biological
  • Molecular Structure
  • Protein Binding
  • Quantitative Structure-Activity Relationship
  • Rats
  • Reproducibility of Results
  • Software