高等学校化学学报 ›› 2026, Vol. 47 ›› Issue (6): 20250401.doi: 10.7503/cjcu20250401

• 高分子化学 • 上一篇    下一篇

基于分子动力学模拟的潜在识别区域下Dectin-1对磷酸化 β-(13)-D-葡聚糖的识别机制

钟彬焱1, 冯玄2, 高余福1, 詹森华1, 石彤非1()   

  1. 1.广东工业大学轻工化工学院, 广州 510006
    2.南洋理工大学化学工程与生物技术学院, 新加坡 637459, 新加坡
  • 收稿日期:2025-12-26 出版日期:2026-06-10 发布日期:2026-04-01
  • 通讯作者: 石彤非 E-mail:tfshi@gdut.edu.cn
  • 基金资助:
    国家自然科学基金(22473032)

Recognition Mechanism of Dectin-1 for Phosphorylated β -1→3-D-Glucan in Potential Recognition Regions Based on Molecular Dynamics Simulations

ZHONG Binyan1, FENG Xuan2, GAO Yufu1, ZHAN Senhua1, SHI Tongfei1()   

  1. 1.School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China
    2.School of Chemical Engineering and Biotechnology,Nanyang Technological University,Singapore 637459,Singapore
  • Received:2025-12-26 Online:2026-06-10 Published:2026-04-01
  • Contact: SHI Tongfei E-mail:tfshi@gdut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22473032)

摘要:

结合分子对接与分子动力学(MD)模拟方法, 探究了磷酸化三螺旋线性β-(1→3)-葡聚糖(TH-CP)与树突状细胞相关C型凝集素-1(Dectin-1)之间的相互作用机制. 研究结果表明, O6及O4,6位点的磷酸化修饰在Dectin-1表面引入了稳定的潜在结合位点, 使TH-CP能够与Dectin-1形成热力学上有利且结构稳定的复合物. 在潜在位点的3种识别方式中, 呈表位识别模式的复合物表现出显著的结合优势. 这主要源于表位识别构型下, TH-CP能够与潜在位点周围更多的氨基酸残基发生协同作用, 从而获得更强的范德华相互作用和静电相互作用. 此外, 磷酸基团中多个羟基可作为灵活的氢键供体和受体, 构建区别于经典位点的新型氢键网络, 使潜在位点介导的识别能力与未修饰β-(1→3)-葡聚糖在经典结合位点的识别能力相当.

关键词: β-(1→3)-葡聚糖, 磷酸化, 树突状细胞相关C型凝集素-1, 识别机制, 分子动力学模拟

Abstract:

Molecular docking combined with molecular dynamics(MD) simulations was employed to investigate the interaction mechanisms between phosphorylated triple-helical linear β-(1→3)-glucan(TH-CP) and dendritic cell- associated C-type lectin-1(Dectin-1). The results demonstrate that phosphorylation at the O6 and O4,6 positions introduces stable potential binding sites on the surface of Dectin-1, enabling TH-CP to form thermodynamically favorable and structurally stable complexes with the receptor. Among the three recognition modes identified at the potential binding site, complexes adopting an epitope recognition pattern exhibit a pronounced binding advantage. This behavior mainly arises from the cooperative interactions between TH-CP and a larger number of surrounding amino acid residues at the potential site, leading to enhanced van der Waals and electrostatic interactions. In addition, multiple hydroxyl groups within the phosphate moieties can act as flexible hydrogen bond donors and acceptors, giving rise to a novel hydrogen-bonding network distinct from that at the classical binding site. As a result, the recognition capability mediated by the potential binding site is comparable to that of unmodified β-(1→3)-glucan interacting with Dectin-1 at the classical binding site.

Key words: β-(1→3)-Glucan, Phosphorylation, Dendritic cell-associated C-type lectin-1, Recognition mode, Molecular dynamic simulation

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