Flexible IgE epitope-containing domains of Phl p 5 cause high allergenic activity Christoph Göbl, PhD, Margarete Focke-Tejkl, PhD, Nazanin Najafi, MSc,

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Flexible IgE epitope-containing domains of Phl p 5 cause high allergenic activity Christoph Göbl, PhD, Margarete Focke-Tejkl, PhD, Nazanin Najafi, MSc, Evelyne Schrank, PhD, Tobias Madl, PhD, Simone Kosol, PhD, Christoph Madritsch, PhD, Yulia Dorofeeva, MD, Sabine Flicker, PhD, Josef Thalhamer, PhD, Rudolf Valenta, MD, Klaus Zangger, PhD, Nico Tjandra, PhD Journal of Allergy and Clinical Immunology Volume 140, Issue 4, Pages 1187-1191 (October 2017) DOI: 10.1016/j.jaci.2017.05.005 Copyright © 2017 Terms and Conditions

Fig 1 Structure of Phl p 5a and domain mobility. A, Overlay of the 10 lowest energy models of both structured regions (left: domain 1 in blue, right: domain 2 in orange) showing the unstructured domain-linking loop and counterdomain in transparent form. Labeling of the helices is performed in a sequential manner starting at the NTD. Backbone dynamics of Phl p 5a are shown as 15N longitudinal relaxation rates (B), transverse relaxation rates (C), overall correlation times (D), and solvent PRE (paramagnetic relaxation enhancement) rates (E); experimental values of structured domains in color, flexible termini and linker in gray, calculated values in black; outliers may arise from high solvent exposure and increased hydrogen exchange with water. Values are plotted as a function of residue number and trimmed mean values of structured regions are indicated by horizontal bars. F, Position of peptides within the Phl p 5a structure. The regions of the peptides are labeled in different colors using a linear gradient ranging from red, displaying the highest average inhibition rate of IgE binding, to blue, with the lowest inhibition. Gray regions were not part of the study. The flexible N-terminus containing P1 was modeled into the structured part of the molecule. Journal of Allergy and Clinical Immunology 2017 140, 1187-1191DOI: (10.1016/j.jaci.2017.05.005) Copyright © 2017 Terms and Conditions

Fig 2 A, Basophil degranulation experiments. RBL cells expressing the human FcεRI were sensitized with sera from 10 grass pollen–allergic patients (#2, 18-26) and then incubated with different concentrations of Phl p 5 or with an equimolar mix of NTD + CTD (0.016 nM, 0.0053 nM, 0.0018 nM, from left to right). The release of β-hexosaminidase is shown as percentage of the total β-hexosaminidase contents of the cells. The horizontal black bars denote the mean values. Asterisks indicate P values of .0022 (**), <.0001 (****), and .0007 (***), respectively. B, Facilitated cross-linking of IgE by Phl p 5a through presence of different domains and repetitive epitopes. In Phl p 5a, the 2 domains (domain 1 blue, domain 2 orange) are connected by an unstructured linker region (right) and are able to sample a much larger volume than a rigid single domain molecule (left). The presence of repetitive IgE epitopes is indicated by the fillings (blank and spotted). C, The unstructured linking region between the domains of Phl p 5a facilitates binding to a second IgE antibody on the surface of mast cells and effector cells and thus may induce more rapid initial cross-linking of FcεRI and degranulation (IgE antibody in gray). Additional IgE molecules with specificity for either a different epitope on the same domain or for a repetitive epitope on the other domain can be engaged, leading to enhanced cross-linking and degranulation. Journal of Allergy and Clinical Immunology 2017 140, 1187-1191DOI: (10.1016/j.jaci.2017.05.005) Copyright © 2017 Terms and Conditions