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The structure of a LAIR1-containing human antibody reveals a novel mechanism of antigen recognition

DOI: 10.7554/eLife.27311 DOI Help

Authors: Fu-lien Hsieh (University of Oxford) , Matthew K. Higgins (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Elife , VOL 6

State: Published (Approved)
Published: May 2017
Diamond Proposal Number(s): 12346

Open Access Open Access

Abstract: Antibodies are critical components of the human adaptive immune system, providing versatile scaffolds to display diverse antigen-binding surfaces. Nevertheless, most antibodies have similar architectures, with the variable immunoglobulin domains of the heavy and light chain each providing three hypervariable loops, which are varied to generate diversity. The recent identification of a novel class of antibody in humans from malaria endemic regions of Africa was therefore surprising as one hypervariable loop contains the entire collagen-binding domain of human LAIR1. Here, we present the structure of the Fab fragment of such an antibody. We show that its antigen-binding site has adopted an architecture that positions LAIR1, while itself being occluded. This therefore represents a novel means of antigen recognition, in which the Fab fragment of an antibody acts as an adaptor, linking a human protein insert with antigen-binding potential to the constant antibody regions which mediate immune cell recruitment.

Subject Areas: Biology and Bio-materials

Instruments: I04-1-Macromolecular Crystallography (fixed wavelength)