4.3 Article

A new method for protein characterization and classification using geometrical features for3Dface analysis: An example of tubulin structures

Journal

PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
Volume 89, Issue 1, Pages 53-67

Publisher

WILEY
DOI: 10.1002/prot.25993

Keywords

3D face analysis; differential geometry; geometrical descriptors; machine learning; protein classification; support vector machine; tubulin

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This study successfully translated biometric 3D face recognition concepts and algorithms into protein biophysics, achieving rapid and precise classification of protein surface morphological features. The results indicate a potential application of this method in protein structure analysis, showing significant competitiveness with existing protein classification methods.
This article reports on the results of research aimed to translate biometric 3D face recognition concepts and algorithms into the field of protein biophysics in order to precisely and rapidly classify morphological features of protein surfaces. Both human faces and protein surfaces are free-forms and some descriptors used in differential geometry can be used to describe them applying the principles of feature extraction developed for computer vision and pattern recognition. The first part of this study focused on building the protein dataset using a simulation tool and performing feature extraction using novel geometrical descriptors. The second part tested the method on two examples, first involved a classification of tubulin isotypes and the second compared tubulin with the FtsZ protein, which is its bacterial analog. An additional test involved several unrelated proteins. Different classification methodologies have been used: a classic approach with a support vector machine (SVM) classifier and an unsupervised learning with a k-means approach. The best result was obtained with SVM and the radial basis function kernel. The results are significant and competitive with the state-of-the-art protein classification methods. This leads to a new methodological direction in protein structure analysis.

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