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Proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization is known to play a critical role in protein folding, splicing, cell signaling and transmembrane active transport. Accurate prediction of proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization in proteins would have many important applications towards the understanding of protein structure and function.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>In this paper, we propose a new approach to predict the proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization in proteins using support vector machine (SVM). The preliminary results indicated that using Radial Basis Function (RBF) kernels could lead to better prediction performance than that of polynomial and linear kernel functions. We used single sequence information of different local window sizes, amino acid compositions of different local sequences, multiple sequence alignment obtained from PSI-BLAST and the secondary structure information predicted by PSIPRED. We explored these different sequence encoding schemes in order to investigate their effects on the prediction performance. The training and testing of this approach was performed on a newly enlarged dataset of 2424 non-homologous proteins determined by X-Ray diffraction method using 5-fold cross-validation. Selecting the window size 11 provided the best performance for determining the proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization based on the single amino acid sequence. It was found that using multiple sequence alignments in the form of PSI-BLAST profiles could significantly improve the prediction performance, the prediction accuracy increased from 62.8% with single sequence to 69.8% and Matthews Correlation Coefficient (MCC) improved from 0.26 with single local sequence to 0.40. Furthermore, if coupled with the predicted secondary structure information by PSIPRED, our method yielded a prediction accuracy of 71.5% and MCC of 0.43, 9% and 0.17 higher than the accuracy achieved based on the singe sequence information, respectively.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>A new method has been developed to predict the proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization in proteins based on support vector machine, which used the single amino acid sequence with different local window sizes, the amino acid compositions of local sequence flanking centered proline residues, the position-specific scoring matrices (PSSMs) extracted by PSI-BLAST and the predicted secondary structures generated by PSIPRED. The successful application of SVM approach in this study reinforced that SVM is a powerful tool in predicting proline <jats:italic>cis<\/jats:italic>\/<jats:italic>trans<\/jats:italic> isomerization in proteins and biological sequence analysis.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2105-7-124","type":"journal-article","created":{"date-parts":[[2006,3,10]],"date-time":"2006-03-10T19:20:51Z","timestamp":1142018451000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":80,"title":["Prediction of cis\/trans isomerization in proteins using PSI-BLAST profiles and secondary structure information"],"prefix":"10.1186","volume":"7","author":[{"given":"Jiangning","family":"Song","sequence":"first","affiliation":[]},{"given":"Kevin","family":"Burrage","sequence":"additional","affiliation":[]},{"given":"Zheng","family":"Yuan","sequence":"additional","affiliation":[]},{"given":"Thomas","family":"Huber","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2006,3,9]]},"reference":[{"key":"863_CR1","doi-asserted-by":"publisher","first-page":"253","DOI":"10.1016\/0022-2836(90)90159-J","volume":"214","author":"DE Stewart","year":"1990","unstructured":"Stewart DE, Sarkar A, Wampler JE: Occurrence and role of cis peptide bonds in protein structures. 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