Structural Analysis of Der P 1-Antibody Complexes and Comparison with Complexes of Proteins or Peptides with Monoclonal Antibodies

Overview

Journal J Immunol

Specialty Allergy & Immunology

Date 2015 May 31

PMID 26026055

Citations 22

Authors

Tomasz Osinski

Anna Pomes

Karolina A Majorek

Jill Glesner

Lesa R Offermann

Lisa D Vailes

Martin D Chapman

Wladek Minor

Maksymilian Chruszcz

Affiliations

Soon will be listed here.

Abstract

Der p 1 is a major allergen from the house dust mite, Dermatophagoides pteronyssinus, that belongs to the papain-like cysteine protease family. To investigate the antigenic determinants of Der p 1, we determined two crystal structures of Der p 1 in complex with the Fab fragments of mAbs 5H8 or 10B9. Epitopes for these two Der p 1-specific Abs are located in different, nonoverlapping parts of the Der p 1 molecule. Nevertheless, surface area and identity of the amino acid residues involved in hydrogen bonds between allergen and Ab are similar. The epitope for mAb 10B9 only showed a partial overlap with the previously reported epitope for mAb 4C1, a cross-reactive mAb that binds Der p 1 and its homolog Der f 1 from Dermatophagoides farinae. Upon binding to Der p 1, the Fab fragment of mAb 10B9 was found to form a very rare α helix in its third CDR of the H chain. To provide an overview of the surface properties of the interfaces formed by the complexes of Der p 1-10B9 and Der p 1-5H8, along with the complexes of 4C1 with Der p 1 and Der f 1, a broad analysis of the surfaces and hydrogen bonds of all complexes of Fab-protein or Fab-peptide was performed. This work provides detailed insight into the cross-reactive and specific allergen-Ab interactions in group 1 mite allergens. The surface data of Fab-protein and Fab-peptide interfaces can be used in the design of conformational epitopes with reduced Ab binding for immunotherapy.

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