Abstract
The epitope recognized by a new anti-Fy6 monoclonal antibody (MoAb) (clone name: NaM185-2C3) was characterized using peptides synthesized on pins (Epitope scanning kit). The clone was obtained from splenocytes of mice immunized with CHO cells expressing the recombinant Duffy glycoprotein. NaM185-2C3 recognized a linear epitope, the essential portion of which was pentapeptide Phe-Glu-Asp-Val-Trp comprising amino acid residues 22-26 of the main (336aa) isoform of the Duffy antigen. All the amino acid residues of the epitope, except Asp, were essential for the antibody-binding, because they could not be replaced by any or most other amino acid residues. The Asp residue could be replaced by most other amino acid residues and its replacement by some amino acid residues gave a distinct increase in the antibody-binding. The MoAb NaM185-2C3, similarly as other anti-Fy6 antibodies, inhibits interleukin (IL)-8-binding to the Duffy antigen. A part of the results was presented at ISBT meeting (Blanchard et al., 1998, Vox Sanguinis, 74, S1, Abstract no. 71).
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