Incorporating support vector machine for identifying protein tyrosine sulfation sites

Wen Chi Chang, Tzong Yi Lee, Dray Ming Shien, Justin Bo Kai Hsu, Jorng Tzong Horng, Po Chiang Hsu, Ting Yuan Wang, Hsien Da Huang, Rong Long Pan

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


Tyrosine sulfation is a post-translational modification of many secreted and membrane-bound proteins. It governs protein-protein interactions that are involved in leukocyte adhesion, hemostasis, and chemokine signaling. However, the intrinsic feature of sulfated protein remains elusive and remains to be delineated. This investigation presents SulfoSite, which is a computational method based on a support vector machine (SVM) for predicting protein sulfotyrosine sites. The approach was developed to consider structural information such as concerning the sec- ondary structure and solvent accessibility of amino acids that surround the sulfotyrosine sites. One hundred sixtytwo experimentally verified tyrosine sulfation sites were identified using UniProtKB/SwissProt release 53.0. The results of a five-fold cross-validation evaluation suggest that the accessibility of the solvent around the sulfotyrosine sites contributes substantially to predictive accuracy. The SVM classifier can achieve an accuracy of 94.2% in five- fold cross validation when sequence positional weighted matrix (PWM) is coupled with values of the accessible sur- face area (ASA). The proposed method significantly outperforms previous methods for accurately predicting the location of tyrosine sulfation sites.

Original languageEnglish
Pages (from-to)2526-2537
Number of pages12
JournalJournal of Computational Chemistry
Issue number15
Publication statusPublished - 2009 Nov 30

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Computational Mathematics


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