期刊
SAR AND QSAR IN ENVIRONMENTAL RESEARCH
卷 30, 期 1, 页码 51-62出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/1062936X.2018.1558416
关键词
Aptamer; artificial neural network; binding affinity; influenza virus; molecular descriptors
类别
资金
- Natural Science Foundation of Hunan Province [2015JJ2042, 12JJ6011]
- Scientific Research Fund of Hunan Provincial Education Department [16A047]
- Open Project Program of State Key Laboratory of Chemo/Biosensing and Chemometrics (Hunan University) [2016013]
- Open Project Program of Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Regeneration (Hunan Institute of Engineering) [2018KF11]
Thousands of investigations on quantitative structure-activity/property relationships (QSARs/QSPRs) have been reported. However, few publications can be found that deal with QSARs for aptamers, because calculating two-dimensional and three-dimensional descriptors directly from aptamers (typically with 15-45 nucleotides) is difficult. This paper describes calculating molecular descriptors from amino acid sequences that are translated from DNA aptamer sequences with DNAMAN software, and developing QSAR models for the aptamers' binding affinity to the influenza virus. General regression neural network (GRNN) based on Parzen windows estimation was used to build the QSAR model by applying six molecular descriptors. The optimal spreading factor sigma of Gaussian function of 0.3 was obtained with the circulation method. The correlation coefficients r from the GRNN model were 0.889 for the training set and 0.892 for the test set. Compared with the existing model for aptamers' binding affinity to the influenza virus, our model is accurate and competes favourably. The feasibility of calculating molecular descriptors from an amino acid sequence translated from DNA aptamer sequences to develop a QSAR model for the anti-influenza aptamers was demonstrated.
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