Incorporating support vector machine for identifying protein tyrosine sulfation sites.
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 secondary structure and solvent accessibility of amino acids that surround the sulfotyrosine sites. One hundred sixty-two 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 surface area (ASA). The proposed method significantly outperforms previous methods for accurately predicting the location of tyrosine sulfation sites.
Chang
Wen-Chi
WC
Department of Biological Science and Technology, National Chiao Tung University, Hsin-Chu, Taiwan.
Lee
Tzong-Yi
TY
Shien
Dray-Ming
DM
Hsu
Justin Bo-Kai
JB
Horng
Jorng-Tzong
JT
Hsu
Po-Chiang
PC
Wang
Ting-Yuan
TY
Huang
Hsien-Da
HD
Pan
Rong-Long
RL
D000465:Algorithms; D003198:Computer Simulation; D008565:Membrane Proteins / Q000737:chemistry*; D019000:Phosphotyrosine / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*
D008565:Membrane Proteins; D013438:Sulfhydryl Compounds; D019000:Phosphotyrosine