Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (1): 256-261.doi: 10.11843/j.issn.0366-6964.2021.027

• RESEARCH NOTES • Previous Articles     Next Articles

Real-time Analysis of the Interaction between RGD Motif and Integrin Based on Surface Plasmon Resonance (SPR)

LI Pengfei1,2, GONG Zhenli2, DU Xiaohua1*, JIANG Tao2*   

  1. 1. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China;
    2. Key Laboratory of Animal Virology of Ministry of Agriculture, State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
  • Received:2020-06-12 Online:2021-01-23 Published:2021-01-19

Abstract: This experiment aims to study the binding specificity of RGD (Arg-Gly-Asp) motif on the structural protein VP1 of foot-and-mouth disease virus (FMDV) to host cell surface receptor integrin. In this paper, the Biacore 3000 system based on surface plasmon resonance (SPR) was used to study the binding specificity of RGD motif with the αvβ6 extracellular domain, αv extracellular domain and β6 extracellular domain, respectively. Firstly, the domains of integrin bound to RGD Motif were screened by binding experiments, and then the kinetic analysis of integrin bound to RGD Motif was carried out. The results showed that the synthesized RGD motif was bound to the αvβ6 extracellular domain, and the kinetic constants Ka, Kd, and KD were 42.3 M-1s-1, 3.1×10-4s-1, and 7.33×10-6M respectively. It also binds to the αv extracellular domain, the kinetic constants were 21.8 M-1s-1, 2.13×10-4s-1,and 9.79×10-5M respectively. There was almost no binding to the extracellular domain of the β6 subunit. The results showed that the binding of RGD to the extracellular domain of αvβ6 was faster and stronger than that of the extracellular domain of αv subunit. This study will provide a reference for further study of the interaction between FMDV and host cell surface receptors.

Key words: Biacore 3000, FMDV, RGD motif, surface plasmon resonance, integrin, kinetics

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