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Journal of Computer-Aided Molecular Design

, Volume 31, Issue 9, pp 829–839 | Cite as

Structure–reactivity modeling using mixture-based representation of chemical reactions

  • Pavel PolishchukEmail author
  • Timur MadzhidovEmail author
  • Timur Gimadiev
  • Andrey Bodrov
  • Ramil Nugmanov
  • Alexandre VarnekEmail author
Article

Abstract

We describe a novel approach of reaction representation as a combination of two mixtures: a mixture of reactants and a mixture of products. In turn, each mixture can be encoded using an earlier reported approach involving simplex descriptors (SiRMS). The feature vector representing these two mixtures results from either concatenated product and reactant descriptors or the difference between descriptors of products and reactants. This reaction representation doesn’t need an explicit labeling of a reaction center. The rigorous “product-out” cross-validation (CV) strategy has been suggested. Unlike the naïve “reaction-out” CV approach based on a random selection of items, the proposed one provides with more realistic estimation of prediction accuracy for reactions resulting in novel products. The new methodology has been applied to model rate constants of E2 reactions. It has been demonstrated that the use of the fragment control domain applicability approach significantly increases prediction accuracy of the models. The models obtained with new “mixture” approach performed better than those required either explicit (Condensed Graph of Reaction) or implicit (reaction fingerprints) reaction center labeling.

Keywords

Chemical reactions Simplex representation of molecular structure Condensed graph of reaction Reaction fingerprints Rate constant prediction Mixtures 

Notes

Acknowledgements

This work was supported by Russian Science Foundation, Grant No. 14-43-00024.

Supplementary material

10822_2017_44_MOESM1_ESM.rdf (2.8 mb)
Supplementary material 1 (RDF 2861 KB)
10822_2017_44_MOESM2_ESM.xlsx (39 kb)
Supplementary material 2 (XLSX 39 KB)
10822_2017_44_MOESM3_ESM.pdf (3.6 mb)
Supplementary material 3 (PDF 3710 KB)

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Institute of Molecular and Translational Medicine, Faculty of Medicine and DentistryPalacky UniversityOlomoucCzech Republic
  2. 2.A.V. Bogatsky Physico-Chemical Institute of National Academy of Sciences of UkraineOdessaUkraine
  3. 3.A.M. Butlerov Institute of ChemistryKazan Federal UniversityKazanRussia
  4. 4.Department of General and Organic ChemistryKazan State Medical UniversityKazanRussia
  5. 5.Laboratory of ChemoinformaticsUniversity of StrasbourgStrasbourgFrance

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