title: [Discriminating acidic, neutral and alkaline enzymes with secondary structure amino acid composition].
abstract: In this work, we systematically analyzed the secondary structure amino acid compositions of acidic and alkaline enzymes and compared them with neutral ones. We found that the propensity of the individual residues to participate in secondary structures and the consistently higher composition of neutral and tiny residues might be the general stability mechanisms for their adaptation to pH extremes. Based on this, we presented a secondary structure amino acid composition method for extracting useful features from sequence. The overall prediction accuracy evaluated by the 10-fold cross-validation reached 80.3%. Comparing our method with other feature extraction methods, the improvement of the overall prediction accuracy ranged from 9.4% to 18.7%. The random forests algorithm also outperformed other machine learning techniques with an improvement ranging from 2.7% to 21.8%.
authors.affiliation: Department of Bioengineering and Biotechnology, Huaqiao University, Xiamen 361021, China.
authors.forename: Guangya
authors.initials: G
authors.lastname: Zhang
authors.forename: Jiaqiang
authors.initials: J
authors.lastname: Gao
authors.forename: Baishan
authors.initials: B
authors.lastname: Fang
mesh_terms: D000465:Algorithms; D000596:Amino Acids / Q000737:chemistry*; D001419:Bacteria / Q000201:enzymology*; D004798:Enzymes / Q000737:chemistry / Q000145:classification; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D017433:Protein Structure, Secondary
chemical_list: D000596:Amino Acids; D004798:Enzymes