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Publication Abstract from PubMed

Allergies have become a rising health problem, where plentiful substances can trigger IgE-mediated allergies in humans. While profilins are considered minor allergens, these ubiquitous proteins are primary molecules involved in cross-reactivity and pollen-food allergy syndrome. Here we report the first crystal structures of murine Fab/IgE, with its chains naturally paired, in complex with the allergen profilin from Hevea brasiliensis (Hev b 8). The crystallographic models revealed that the IgE's six complementarity-determining regions (CDRs) interact with the allergen, comprising a rigid paratope-epitope surface of 926 A(2), which includes an extensive network of interactions. Interestingly, we also observed previously unreported flexibility at Fab/IgE's elbow angle, which did not influence the shape of the paratope. The Fab/IgE exhibits a high affinity for Hev b 8, even when using 1 M NaCl in BLI experiments. Finally, based on the encouraging cross-reactivity assays using two mutants of the maize profilin (Zea m 12), this antibody could be a promising tool in IgE engineering for diagnosis and research applications.

A native IgE in complex with profilin provides insights into allergen recognition and cross-reactivity.,Garcia-Ramirez B, Mares-Mejia I, Rodriguez-Hernandez A, Cano-Sanchez P, Torres-Larios A, Ortega E, Rodriguez-Romero A Commun Biol. 2022 Jul 27;5(1):748. doi: 10.1038/s42003-022-03718-w. PMID:35902770^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.