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Published on: November 22, 2024
Improving Fmoc Solid Phase Synthesis of Human Beta Defensin 3
Aleksandra Walewska1, Paulina Kosikowska-Adamus1, Marta Tomczykowska1
1Department of Organic Chemistry, Faculty of Chemistry, University of Gdansk, 80-308 Gdansk, Poland.
Abstract:
Human β-defensin 3, HBD-3, is a 45-residue antimicrobial and immunomodulatory peptide that plays multiple roles in the host defense system. In addition to interacting with cell membranes, HBD-3 is also a ligand for melanocortin receptors, cytokine receptors and voltage-gated potassium channels. Structural and functional studies of HBD-3 have been hampered by inefficient synthetic and recombinant expression methods. Herein, we report an optimized Fmoc solid-phase synthesis of this peptide using an orthogonal disulfide bonds formation strategy. Our results suggest that utilization of an optimized resin, coupling reagents and pseudoproline dipeptide building blocks decrease chain aggregation and largely improve the amount of the target peptide in the final crude material, making the synthesis more efficient. We also present an alternative synthesis of HBD-3 in which a replacement of a native disulfide bridge with a diselenide bond improved the oxidative folding. Our work enables further biological and pharmacological characterization of HBD-3, hence advancing our understanding of its therapeutic potential.
Insights
We optimized the synthesis of human β-defensin 3 (HBD-3), a key antimicrobial peptide. This improved method facilitates further research into HBD-3
Area of Science:
- Biochemistry
- Immunology
- Peptide Synthesis
Background:
- Human β-defensin 3 (HBD-3) is a crucial antimicrobial and immunomodulatory peptide involved in host defense.
- HBD-3 interacts with cell membranes and acts as a ligand for various receptors, including melanocortin and cytokine receptors, and voltage-gated potassium channels.
- Previous structural and functional studies of HBD-3 were limited by inefficient synthetic and recombinant expression methods.
Purpose of the Study:
- To develop an optimized Fmoc solid-phase synthesis strategy for human β-defensin 3 (HBD-3).
- To improve the efficiency and yield of HBD-3 peptide synthesis.
- To explore alternative disulfide bond formation strategies, including the use of diselenide bonds, to enhance oxidative folding.
Main Methods:
- Utilized optimized resin, coupling reagents, and pseudoproline dipeptide building blocks for Fmoc solid-phase synthesis.
- Employed an orthogonal disulfide bond formation strategy.
- Investigated the replacement of a native disulfide bridge with a diselenide bond for improved oxidative folding.
Main Results:
- The optimized synthesis significantly decreased chain aggregation and improved the yield of the target HBD-3 peptide.
- The use of pseudoproline dipeptide building blocks enhanced the efficiency of the synthesis.
- Replacing a native disulfide bridge with a diselenide bond improved the oxidative folding process.
Conclusions:
- The developed optimized Fmoc solid-phase synthesis method enhances the efficiency and yield of HBD-3 production.
- The alternative synthesis using a diselenide bond offers improved oxidative folding.
- These advancements enable comprehensive biological and pharmacological characterization of HBD-3, advancing its therapeutic potential.
