Journal of Computer-Aided Molecular Design

, Volume 6, Issue 1, pp 61–78 | Cite as

The computer program LUDI: A new method for the de novo design of enzyme inhibitors

  • Hans-Joachim Böhm
Research Papers


A new computer program is described, which positions small molecules into clefts of protein structures (e.g. an active site of an enzyme) in such a way that hydrogen bonds can be formed with the enzyme and hydrophobic pockets are filled with hydrophobic groups. The program works in three steps. First it calculates interaction sites, which are discrete positions in space suitable to form hydrogen bonds or to fill a hydrophobic pocket. The interaction sites are derived from distributions of nonbonded contacts generated by a search through the Cambridge Structural Database. An alternative route to generate the interaction sites is the use of rules. The second step is the fit of molecular fragments onto the interaction sites. Currently we use a library of 600 fragments for the fitting. The final step in the present program is the connection of some or all of the fitted fragments to a single molecule. This is done by bridge fragments. Applications are presented for the crystal packing of benzoic acid and the enzymes dihydrofolate reductase and trypsin.

Key words

Enzymes Enzyme inhibitors Molecular modeling Drug design De novo design 


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Copyright information

© ESCOM Science Publishers B.V 1992

Authors and Affiliations

  • Hans-Joachim Böhm
    • 1
  1. 1.Central ResearchBASF AGLudwigshafenGermany

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