Study on the Stability and Enzymatic Property Improvement of Porcine Pancreas Lipase Modified by Ionic Liquids Using Molecular Simulation

doi:10.6023/A15070496

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (1): 74-80.DOI: 10.6023/A15070496 Previous Articles Next Articles

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基于分子模拟的离子液体修饰Porcine Pancreas脂肪酶催化性能和稳定性的相关研究

张川^a, 张鲁嘉^b, 张洋^a, 黄和^a, 胡燚^a

a 南京工业大学材料化学工程国家重点实验室生物与制药工程学院南京 210009;
b 华东理工大学生物反应器工程国家重点实验室生物工程学院上海 200237

投稿日期:2015-07-18 发布日期:2015-10-29
通讯作者: 张鲁嘉, 胡燚 E-mail:ljzhang@ecust.edu.cn;huyi@njut.edu.cn
基金资助:
受国家高技术研究发展计划(No. 2011AA02A209)和国家杰出青年科学基金(No. 21225626)资助.

Study on the Stability and Enzymatic Property Improvement of Porcine Pancreas Lipase Modified by Ionic Liquids Using Molecular Simulation

Zhang Chuan^a, Zhang Lujia^b, Zhang Yang^a, Huang He^a, Hu Yi^a

a State Key Laboratory of Material-Oriented Chemical Engineering of Nanjing University of Technology, School of Biotechnology and Pharmaceutical Engineering, Nanjing 210009;
b State Key Laboratory of Bioreactor Engineering of East China University of Science and Technology, School of Biotechnology, Shanghai 200237

Received:2015-07-18 Published:2015-10-29
Supported by:
Project supported by the Hi-Tech Research and Development Program of China (No. 2011AA02A209) and The National Science Fund for Distinguished Young Scholars (No. 21225626).

Application of molecular modelling techniques to make reasonable analysis for the enzymatic properties change, reaction mechanism and further to guide the directed molecular alteration of enzymes from the molecular level is an important content of the current research in the field of enzyme engineering. While the effectiveness of ionic liquid in enhancing the stability and potency of protein pharmaceuticals has been validated for years, the underlying mechanism remains poorly understood, particularly at the molecular level. A molecular dynamics simulation was developed using a procedure that allowed a united-atom level examination of the interaction between [HOOCBMIm]⁺ and a conjugated protein represented by Porcine Pancreas lipase (PPL). Molecular dynamics (MD) simulation was performed to investigate the mechanism towards the improvement in structural stability and catalytic efficiency of the Engineered PPL by [HOOCBMIm]Cl ionic liquid. The electrostatic potential, energy change and RMSD (Root Mean Square Deviation) analysis showed the enhanced stability of engineered PPL. And the solvent accessible surface area (SASA) analysis showed the enhanced catalytic activity. The results showed that Engineered PPL's RMSD value (0.537 Å) was less than Wild-type PPL's (0.68 Å) at 335 K. This indicates that the Engineered PPL conformation becomes more stable. With binding the modifier on Wild-type PPL, we found that hydrophobicity area and SASA of Enginneerd PPL were increased. These phenomena indicate that the affinity of modifier for water generates a water layer surrounding the active center. And the electrostatic potential around the modified sites is negative before binding the modifier, that neutralization of these like charges upon modification lessens the tendency of the enzyme to unfold and also benefit for substrate into catalytic sites to enhance the catalytic activity. The results presented here provided sight into interaction between ionic liquid with the conjugated PPL at molecular level and offered a tool to analyze chemical modification to change enzymatic properties. Nevertheless, the simulation, as also attempted by this study, provides molecular insight into the chemical modification to PPL, which is essential to the design, fabrication, and application of Engineered-PPL.

Key words: Porcine Pancreas lipase, molecular dynamics simulation, ionic liquid, catalytic performance, stability

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Zhang Chuan, Zhang Lujia, Zhang Yang, Huang He, Hu Yi. Study on the Stability and Enzymatic Property Improvement of Porcine Pancreas Lipase Modified by Ionic Liquids Using Molecular Simulation[J]. Acta Chim. Sinica, 2016, 74(1): 74-80.

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基于分子模拟的离子液体修饰Porcine Pancreas脂肪酶催化性能和稳定性的相关研究

Study on the Stability and Enzymatic Property Improvement of Porcine Pancreas Lipase Modified by Ionic Liquids Using Molecular Simulation

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