PON-tstab: Protein Variant Stability Predictor. Importance of Training Data Quality.

Yang Y, Urolagin S, Niroula A, Ding X, Shen B, Vihinen M

Int J Mol Sci 19 (4) - [2018-03-28; online 2018-03-28]

Several methods have been developed to predict effects of amino acid substitutions on protein stability. Benchmark datasets are essential for method training and testing and have numerous requirements including that the data is representative for the investigated phenomenon. Available machine learning algorithms for variant stability have all been trained with ProTherm data. We noticed a number of issues with the contents, quality and relevance of the database. There were errors, but also features that had not been clearly communicated. Consequently, all machine learning variant stability predictors have been trained on biased and incorrect data. We obtained a corrected dataset and trained a random forests-based tool, PON-tstab, applicable to variants in any organism. Our results highlight the importance of the benchmark quality, suitability and appropriateness. Predictions are provided for three categories: stability decreasing, increasing and those not affecting stability.

Abhishek Niroula

DDLS Fellow

PubMed 29597263

DOI 10.3390/ijms19041009

Crossref 10.3390/ijms19041009

pmc: PMC5979465
pii: ijms19041009

Publications 9.5.0