Enhancement Predicting Accuracy for Elastin-Like Polypeptides Temperature Transition by Back Propagation Neural Network
Abstract: Elastin-like polypeptides (ELPs) have been widely used to promote the development of a variety of smart biomaterials.
Transition temperature is a key attribute of ELPs central to ELPs researches. Therefore, it is essential to establish
predictive models of transition temperature that are both computationally efficient and reliable by employing simple
parameters. Back propagation neural network (BPNN), a powerful feed-forward algorithm designed to solve problems
with overwhelming complexity, has been successfully used in non-linear predictor model. In this study, two pH-sensitive
ELPs were expressed, purified and determined for temperature transition across a range of pH. The pH, concentration and
molecular weight (MW) as well as isoelectric point (PI) and pseudo amino acid (PseAA) of these two ELPs were adopted
as input parameters. Support vector machine (SVM) and back propagation neural network (BPNN) were performed respectively.
We selected Lamda (λ) value by training set and evaluated predictor model by jackknife test that combined
with Uniform Design (UD). According to the results of BPNN and SVM, whose mean absolute error (MAE) of BPNN
model jackknife test were 4.80 and 4.95 respectively, the predictive ability of BPNN is a minor improvement over SVM.
Applying Mackay’s data, MAE of BPNN jackknife test was 2.02, while the MAE between experimental and predicted
transition temperature was 2.30 in Mackay’s predictor model. Compared with Mackay predictor model, the enhancement
in the accuracy indicates that the proposed BPNN method could play a complementary role to predict ELPs transition
Keywords: BP neural network, elastin-like polypentapetides, support vector machines, transition temperature, Uniform Design.
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