WRF-TMH: predicting transmembrane helix by fusing composition index and physicochemical properties of amino acids

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• 作者：Maqsood Hayat (1) (2)
  Asifullah Khan (2)
  
• 关键词：Transmembrane helix ; Physicochemical properties ; Compositional index ; Weighted random forest ; Structures of membrane proteins
• 刊名：Amino Acids
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：44
• 期：5
• 页码：1317-1328
• 全文大小：563KB
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• 作者单位：Maqsood Hayat (1) (2)
  Asifullah Khan (2)
  
  1. Abdul Wali Khan University, Mardan, Pakistan
  2. Pattern Recognition Lab, Department of Computer and Information Sciences, Pakistan Institute of Engineering and Applied Sciences, Nilore, 45650, Islamabad, Pakistan
  
• ISSN：1438-2199

文摘

Membrane protein is the prime constituent of a cell, which performs a role of mediator between intra and extracellular processes. The prediction of transmembrane (TM) helix and its topology provides essential information regarding the function and structure of membrane proteins. However, prediction of TM helix and its topology is a challenging issue in bioinformatics and computational biology due to experimental complexities and lack of its established structures. Therefore, the location and orientation of TM helix segments are predicted from topogenic sequences. In this regard, we propose WRF-TMH model for effectively predicting TM helix segments. In this model, information is extracted from membrane protein sequences using compositional index and physicochemical properties. The redundant and irrelevant features are eliminated through singular value decomposition. The selected features provided by these feature extraction strategies are then fused to develop a hybrid model. Weighted random forest is adopted as a classification approach. We have used two benchmark datasets including low and high-resolution datasets. tenfold cross validation is employed to assess the performance of WRF-TMH model at different levels including per protein, per segment, and per residue. The success rates of WRF-TMH model are quite promising and are the best reported so far on the same datasets. It is observed that WRF-TMH model might play a substantial role, and will provide essential information for further structural and functional studies on membrane proteins. The accompanied web predictor is accessible at http://111.68.99.218/WRF-TMH/.