Development and Characterization of Polymeric Peptides for Antibody Tagging of Bacterial Targets
| Autor: | Salvador Eugenio C. Caoili, Bobbie Marie M Santos, Ruby Anne N King, Fresthel Monica M Climacosa |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Staphylococcus aureus Neutrophils Antimicrobial peptides Peptide medicine.disease_cause Biochemistry 03 medical and health sciences 0302 clinical medicine Structural Biology Escherichia coli medicine Humans chemistry.chemical_classification Oligopeptide biology Antibody-Dependent Cell Cytotoxicity General Medicine biology.organism_classification medicine.disease Hemolysis Antibody opsonization 030104 developmental biology Trinitrobenzenesulfonic Acid chemistry 030220 oncology & carcinogenesis Female Peptides Hapten Bacteria |
| Zdroj: | Protein & Peptide Letters. 27:962-970 |
| ISSN: | 0929-8665 |
| DOI: | 10.2174/0929866527666200427212940 |
| Popis: | Background: Microbe-Binding Peptides (MBPs) are currently being investigated to address the problem of antimicrobial resistance. Strategies enhancing their antimicrobial activity have been developed, including peptide dimerization. Here, we present an alternative approach based on peptide polymerization, yielding hapten-labelled polymeric MBPs that mediate tagging of bacteria with anti-hapten antibodies, for enhanced immune recognition by host phagocytes. Methods: C-terminally amidated analogs of the bacterial-binding peptide IIGGR were synthesized, with or without addition of cysteine residues at both N- and C-termini. Peptides were subjected to oxidizing conditions in a dimethyl-sulfoxide/water solvent system, and polymerization was demonstrated using SDS-PAGE. Peptides were then N-terminally labelled with a trinitrophenyl (TNP) group using trinitrobenzene sulfonate (TNBS). Binding to representative bacteria was demonstrated by ELISA using anti-TNP antibodies and was quantified as half-maximal effective concentration (EC50). Minimum Inhibitory Concentration (MIC) and concentration yielding 50% hemolysis (H50) were estimated. Neutrophil phagocytic index was determined for TNP-labelled polymeric bacterial- binding peptide (Pbac) with anti-TNP antibodies and/or serum complement. Results: Polydisperse Pbac was synthesized. EC50 was lower for Pbac than for the corresponding monomeric form (Mbac), for both Staphylococcus aureus ATCC 29213 and Escherichia coli ATCC 25922. MIC and H50 were >250μg/mL for both Pbac and Mbac. A complement-independent increase in neutrophil phagocytic index was observed for E. coli treated with TNP-labelled Pbac in conjunction with anti-TNP antibodies. Conclusion: Our data suggest that hapten-labelled polymeric bacterial-binding peptides may easily be produced from even crude synthetic oligopeptide precursors, and that such bacterial-binding peptides in conjunction with cognate anti-hapten antibodies can enhance immune recognition of bacteria by host phagocytes. |
| Databáze: | OpenAIRE |
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