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A comparative study of family-specific protein–ligand complex affinity prediction based on random forest approach

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Abstract

The assessment of binding affinity between ligands and the target proteins plays an essential role in drug discovery and design process. As an alternative to widely used scoring approaches, machine learning methods have also been proposed for fast prediction of the binding affinity with promising results, but most of them were developed as all-purpose models despite of the specific functions of different protein families, since proteins from different function families always have different structures and physicochemical features. In this study, we proposed a random forest method to predict the protein–ligand binding affinity based on a comprehensive feature set covering protein sequence, binding pocket, ligand structure and intermolecular interaction. Feature processing and compression was respectively implemented for different protein family datasets, which indicates that different features contribute to different models, so individual representation for each protein family is necessary. Three family-specific models were constructed for three important protein target families of HIV-1 protease, trypsin and carbonic anhydrase respectively. As a comparison, two generic models including diverse protein families were also built. The evaluation results show that models on family-specific datasets have the superior performance to those on the generic datasets and the Pearson and Spearman correlation coefficients (R p and Rs) on the test sets are 0.740, 0.874, 0.735 and 0.697, 0.853, 0.723 for HIV-1 protease, trypsin and carbonic anhydrase respectively. Comparisons with the other methods further demonstrate that individual representation and model construction for each protein family is a more reasonable way in predicting the affinity of one particular protein family.

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Acknowledgments

This work was funded by the National Natural Science Foundation of China (No. 21175095, 21273154, 21375090).

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Authors and Affiliations

  1. College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, People’s Republic of China

    Yu Wang, Yanzhi Guo, Qifan Kuang, Xuemei Pu, Yue Ji, Zhihang Zhang & Menglong Li

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  1. Yu Wang
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  2. Yanzhi Guo
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  3. Qifan Kuang
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  4. Xuemei Pu
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  5. Yue Ji
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  6. Zhihang Zhang
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Correspondence to Yanzhi Guo or Menglong Li.

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Wang, Y., Guo, Y., Kuang, Q. et al. A comparative study of family-specific protein–ligand complex affinity prediction based on random forest approach. J Comput Aided Mol Des 29, 349–360 (2015). https://doi.org/10.1007/s10822-014-9827-y

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  • DOI: https://doi.org/10.1007/s10822-014-9827-y

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