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Lv-Meng Hu(胡吕梦), Yuan-Qiang Chen(陈远强), Hong-Ming Ding(丁泓铭), and Yu-Qiang Ma(马余强). 2025: Molecular simulation study on phase separation of immunoglobulin G, Chinese Physics B, 34(8): 088701. doi: 10.1088/1674-1056/add50b
Citation: Lv-Meng Hu(胡吕梦), Yuan-Qiang Chen(陈远强), Hong-Ming Ding(丁泓铭), and Yu-Qiang Ma(马余强). 2025: Molecular simulation study on phase separation of immunoglobulin G, Chinese Physics B, 34(8): 088701. doi: 10.1088/1674-1056/add50b
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Molecular simulation study on phase separation of immunoglobulin G

  • 1 Center for Soft Condensed Matter Physics and Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China;

  • 2 National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;

  • 3 Jiangsu Physical Science Research Center, Nanjing 210093, China

  • Received Date: 02/04/2025
    Accepted Date: 28/04/2025
  • Fund Project:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 12222506, 12347102, and 12174184).

  • PACS: 87.10.Tf; 64.75.-g; 87.15.-v; 87.15.A-

  • Understanding the liquid-liquid phase separation (LLPS) of immunoglobulin G (IgG) is crucial, as it profoundly influences IgG's biological activity and stability. In this study, we employed coarse-grained molecular dynamics simulations to systematically investigate the phase separation behavior of IgG. We first constructed two types of IgG models: all-pair IgG model and partial-pair IgG model, and compared the coexistence curve from our simulations with experimental data. Our results showed that the partial-pair IgG model aligns better with the experimental critical temperature and critical density. Using this model, we then calculated the temperature-dependent variations of IgG's radius of gyration, surface tension, viscosity, etc. More importantly, we demonstrated that variations in the interaction strengths among IgG molecules significantly influence their phase separation behavior. Specifically, a higher standard deviation of interaction strength at different temperatures is found to lead to more stable phase-separated states. Furthermore, we observed that the introduction of repulsive polymers and strongly attractive polymers consistently enhances IgG phase separation, while weakly attractive polymers exhibit a dual regulatory effect on the phase separation. Overall, this study provides valuable insights into the mechanisms governing IgG phase behavior, with potential implications for optimizing biopharmaceutical products.
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Molecular simulation study on phase separation of immunoglobulin G

  • Received Date: 02/04/2025
  • Accepted Date: 28/04/2025
Fund Project: 

Abstract: Understanding the liquid-liquid phase separation (LLPS) of immunoglobulin G (IgG) is crucial, as it profoundly influences IgG's biological activity and stability. In this study, we employed coarse-grained molecular dynamics simulations to systematically investigate the phase separation behavior of IgG. We first constructed two types of IgG models: all-pair IgG model and partial-pair IgG model, and compared the coexistence curve from our simulations with experimental data. Our results showed that the partial-pair IgG model aligns better with the experimental critical temperature and critical density. Using this model, we then calculated the temperature-dependent variations of IgG's radius of gyration, surface tension, viscosity, etc. More importantly, we demonstrated that variations in the interaction strengths among IgG molecules significantly influence their phase separation behavior. Specifically, a higher standard deviation of interaction strength at different temperatures is found to lead to more stable phase-separated states. Furthermore, we observed that the introduction of repulsive polymers and strongly attractive polymers consistently enhances IgG phase separation, while weakly attractive polymers exhibit a dual regulatory effect on the phase separation. Overall, this study provides valuable insights into the mechanisms governing IgG phase behavior, with potential implications for optimizing biopharmaceutical products.

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