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Molecular Docking and Molecular Dynamics (MD) Simulation of Human Anti-Complement Factor H (CFH) Antibody Ab42 and

Bing Yang1,2, Shu-Jian Lin3,4, Jia-Yi Ren5

  • 1Institute of Biomedicine, Jinan University, Guangzhou 510632, China. candyYang_3940@163.com.

International Journal of Molecular Sciences
|May 28, 2019
PubMed

Insights

Researchers analyzed the interaction between the Ab42 antibody and Complement factor H (CFH) using computational and experimental methods. This study elucidates the binding mechanism, aiding in the development of novel antibody drugs for cancer therapy.

Area of Science:

  • Immunology
  • Structural Biology
  • Computational Chemistry

Background:

  • Understanding antibody-antigen interactions and epitopes is crucial for developing monoclonal antibody drugs.
  • Complement factor H (CFH) is implicated in tumor progression, and autoantibodies against CFH show anti-tumor activity.
  • Monoclonal antibody Ab42 was isolated from a cancer patient, suggesting potential therapeutic relevance.

Purpose of the Study:

  • To investigate the molecular interaction mechanism between the human monoclonal antibody Ab42 and its target antigen, Complement factor H polypeptide (pCFH).
  • To validate computational findings through experimental verification for robust insights into antibody-antigen binding.

Main Methods:

  • Utilized molecular docking, molecular dynamics (MD) simulation, free energy calculation, and computational alanine scanning (CAS) for theoretical analysis.
  • Performed experimental alanine scanning (EAS) to confirm the computational predictions.
  • Focused on identifying specific amino acid residues involved in the interaction.

Main Results:

  • The Ab42 antibody forms hydrogen bonds with the pCFH antigen.
  • Key residues involved in the interaction include Tyr315, Ser100, Gly33, and Tyr53 on the antibody's complementarity-determining regions (CDRs).
  • These CDR residues interact with specific amino acid residues (Pro441, Ile442, Asp443, Asn444, Ile447, and Thr448) on the pCFH antigen.

Conclusions:

  • This study successfully elucidated the interaction mechanism between the Ab42 antibody and its pCFH antigen through integrated theoretical and experimental approaches.
  • The detailed understanding of this interaction has significant theoretical implications for the design and development of new antibody-based therapeutics.
  • Identified critical binding sites and interactions provide a foundation for engineering improved antibody drugs.
Keywords:
complement factor H (CFH)complementarity-determining region (CDR)computational alanine scanning (CAS)experimental alanine scanning (EAS)molecular dockingmolecular dynamics (MD) simulation

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