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Zwitterionic peptides protect protein drugs via hydration. Incorporating specific amino acids like proline reduced immunogenicity, while charge imbalance in EKS and EKG motifs increased it, guiding future drug design.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Immunology

Background:

  • Zwitterionic peptides, particularly those with alternating glutamic acid (E) and lysine (K) residues, offer protective effects for protein drugs due to their high hydration capacity.
  • Short EK peptides have demonstrated protective benefits and low immunogenicity, but high-molecular-weight single-chain (HMWSC) zwitterionic peptides require structure-disrupting amino acids for enhanced protective ability.

Purpose of the Study:

  • To investigate the immunogenicity of EK-motif-based peptides, including those with structure-disrupting amino acids (P, S, G).
  • To computationally model the structure and dynamics of these peptides to correlate sequence with immunogenicity.
  • To evaluate the immunogenic behavior of HMWSC zwitterionic sequences conjugated to interferon-alpha 2a (IFN) and identify key immunogenic regions.

Main Methods:

  • Synthesis and linkage of eight EK-motif-based peptides to keyhole limpet hemocyanin (KLH) for immunogenicity testing.
  • Computational modeling using Rosetta protein predictions and molecular dynamics (MD) simulations to analyze peptide structure and dynamics.
  • Conjugation of HMWSC zwitterionic sequences to interferon-alpha 2a (IFN) and subsequent immunogenicity assessment.
  • Epitope mapping and alanine scanning experiments on serum from immunized mice.

Main Results:

  • Two motifs, EKS and EKG, exhibited significantly higher immunogenicity compared to other motifs, especially those containing proline (P).
  • Computational models indicated that higher immunogenicity peptides (EKS, EKG) possess regions of charge imbalance.
  • HMWSC zwitterionic sequences conjugated to IFN showed consistent immunogenic profiles, and experimental data confirmed the link between charge imbalance and immunogenicity.

Conclusions:

  • The presence of specific amino acid sequences (EKS, EKG) and charge imbalance are key factors influencing the immunogenicity of zwitterionic peptides.
  • Structure-disrupting amino acids, particularly proline, can reduce peptide immunogenicity.
  • These findings provide crucial insights for designing safer and more effective protein drug conjugates with minimized immunogenic risks.