以支持向量機鑑別原核生物之嗜寒、中溫、嗜熱、及超嗜熱蛋白質

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姓名

吳行展(Sing-Jhan Wu) 查詢紙本館藏

畢業系所

系統生物與生物資訊研究所

論文名稱

以支持向量機鑑別原核生物之嗜寒、中溫、嗜熱、及超嗜熱蛋白質
(Discrimination of psychrophilic, mesophilic thermophilic, and hyperthermophilic proteins in prokaryotes using Support Vector Machine)

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摘要(中)

蛋白質熱穩定性無論在基礎科學或工業應用上都是很重要的課題，許多研究在同源蛋白質之間進行序列和結構上的比較分析，從中找出對熱穩定具有重要意義的影響因子。過去的研究發現，蛋白質序列上胺基酸組成(Amino Acid Composition)、疏水性交互作用(Hydrophobic Interaction)、離子交互作用(Ionic Interaction)等許多特性都被認為與蛋白質熱穩定有重要關係。相對於嗜熱蛋白質，嗜寒蛋白質的工業應用亦相當重要，但相關研究則相對較少。本研究目的在分析各種蛋白質物化特徵，發展出可預測嗜熱蛋白質及嗜寒蛋白質的系統，並探討不同特徵於四種溫度分類群組間之關係。我們利用NCBI原核生物基因體計畫所提供的資料，截取大量蛋白質及相關溫度資訊，計算出特徵後再配合特徵選取演算法，過濾出與溫度具相關性的重要因子，再運用機器學習方法，建立具有穩定效能的預測模型，我們認為三種型式的胺基酸組成(Amino Acid Composition, Dipeptide Composition, Pseudo Amino Acid Composition)對於蛋白質的溫度分類有顯著的效果。

摘要(英)

The study of protein thermostability plays an important role in both basic and applied research. Most of the studies on protein thermostability are focused on the analysis of structure or sequence comparison among homologous proteins, and identify the factors that affect the protein thermostability. Scientists had found key properties that influence protein thermostability, such as amino acid composition, hydrophobic interaction, and ionic interaction, etc. However, the properties correlate to psychrophilic properties of proteins are less studied. The purpose of this study is to analyze the properties of selected pools of proteins by developing a method to predict the thermostability or psychrophilicity. Furthermore, to identify which are the key features We used the data provided by NCBI prokaryotic genome project to select 86470 proteins and the temperature data, the optimal growth temperatures from the source prokaryotes, followed by calculation of protein features by feature selection algorithm. Finally, the vital factors related to temperatures, amino acid composition, dipeptide composition, pseudo amino acid composition are selected. A machine learning method is performed to build a robust prediction model on protein thermostability and psychrophilicity. We believed these three types of amino acid composition have a significant effect on protein temperature classification.

關鍵字(中)

★ 支持向量機
★ 蛋白質熱穩定性
★ 蛋白質嗜寒性
★ 機器學習演算法

關鍵字(英)

★ Machine learning algorithms
★ Support vector machine
★ Protein thermostability
★ Protein psychrophilicity

論文目次

中文摘要………………………………………………………………V
Abstract………………………………………………………………VI
致謝…………………………………………………………………VII
Contents……………………………………………………………VIII
List of Figures………………………………………………………X
List of Tables………………………………………………………XI
Chapter 1.Introduction………………………………………………1
1.1 Background……………………………………………………1
1.1.1 Extremophile…………………………………………1
1.1.2 Protein…………………………………………………1
1.1.3 Protein thermostability …………………………3
1.1.4 Protein psychrophilicity…………………… 4
1.1.5 Optimal growth temperature……………………6
1.2 Motivation……………………………………………………6
1.3 Problem…………………………………………………… 6
1.4 Goal……………………………………………………… 7
Chapter 2.Related Works……………………………………… 9
2.1 NCBI Entrez Genome Project Database……………… 9
2.2 Temperature information……………………………… 9
2.2.1 PGTdb ………………………………………………9
2.2.2 Culture collection center…………………… 10
2.3 Phylogenetic analysis tool………………………… 10
2.3.1 PHYLIP…………………………………………… 11
2.3.2 iToL……………………………………………… 11
2.4 Machine learning and statistic tool……………… 11
2.4.1 WEKA……………………………………………… 11
2.4.2 LIBSVM…………………………………………… 12
2.4.3 SPSS……………………………………………… 12
2.5 Recent prediction toolon protein thermostability…12
Chapter 3.Materials and Methods…………………………… 13
3.1 Materials………………………………………………… 13
3.1.1 Prokaryotes and optimal growth temperature…13
3.1.2 Protein sequences……………………………… 14
3.1.3 Physicochemical properties of protein…… 14
3.2 Methods…………………………………………………… 16
3.2.1 System flow……………………………………… 16
3.2.2 Microorganisms sampling……………………… 18
3.2.3 Protein sampling……………………………… 20
3.2.4 Feature selection……………………………… 20
3.2.5 Statistical test……………………………… 21
3.2.6 Machine learning technique………………… 22
3.2.7 Performance index……………………………… 22
Chapter 4.Results……………………………………………… 23
4.1 Phylogenetic tree……………………………………… 23
4.2 Key feature ………………………………………………30
4.3 Statistical analysis of protein features from four categories……………………………………………………… 32
4.4 Discrimination of proteins from four categories…37
4.5 Discrimination of thermophilic and mesophilic proteins…………………………………………………………… 37
4.6 Discrimination of psychrophilic and mesophilic proteins…………………………………………………………… 38
Chapter 5.Discussion…………………………………………… 39
Chapter 6.Conclusion…………………………………………… 41
References……………………………………………………………42
Appendix………………………………………………………………44

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指導教授

黃雪莉、洪炯宗
(Shir-Ly Huang、Jorng-Tzong Horng)

審核日期

2008-7-24

推文