Journal of Computer-Aided Molecular Design

, Volume 5, Issue 6, pp 571–584 | Cite as

Structure-activity relationship of Ca2+ channel blockers: A study using conformational analysis and chemometric methods

  • L. Belvisi
  • S. Brossa
  • A. Salimbeni
  • C. Scolastico
  • R. Todeschini
Research Papers

Summary

A structure-activity relationship study has been done on 8 compounds with the activity known as ‘Ca2+ channel blockers’. Conformational analysis was carried out using a molecular mechanics method. The 3D-QSAR approach was used and the most polar functional groups present in all the molecules were considered. Eight interatomic distances are necessary to define the relative spatial disposition of these relevant molecular fragments. The structure-activity relationship between interatomic distances and biological activity was performed using statistic and chemometric methods. In particular, with Principal Component Analysis, it was possible to reduce the number of interatomic distances: only six of the eight distances are sufficient to describe the system in a useful way. A classification method was iteratively used to select the most probable conformations linked to the biological activity and to build a model able to classify conformations according to their biological behaviour. Cluster analysis on the active selected conformations subsequently allowed the identification of two different geometrical patterns for the active compounds. Finally the validity of the model was verified by correctly predicting the activity of other molecules not used in the construction of the model but possessing known activity.

Key words

Calcium channel blockers Conformational analysis Principal Component Analysis Chemometric methods Pharmacophore identification 

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Copyright information

© ESCOM Science Publishers B.V. 1991

Authors and Affiliations

  • L. Belvisi
    • 1
  • S. Brossa
    • 1
  • A. Salimbeni
    • 2
  • C. Scolastico
    • 1
  • R. Todeschini
    • 3
  1. 1.Dipartimento di Chimica Organica e IndustrialeCentro del C.N.R.MilanItaly
  2. 2.Istituto LusoFarmaco d'Italia S.p.a.MilanItaly
  3. 3.Dipartimento di Chimica Fisica e ElettrochimicaMilanItaly

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