9sfx

Secukinumab Fv in complex with human IL-17A

spinqualitylabelsall models 9sfx, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9sfx is a 5 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function IL17_HUMAN Induces stromal cells to produce proinflammatory and hematopoietic cytokines. Enhances the surface expression of ICAM1/intracellular adhesion molecule 1 in fibroblasts. Publication Abstract from PubMed Monoclonal antibodies are well established as promising treatment options for a broad range of patients with severe diseases. In some cases, the formation of anti-drug antibodies (ADA) may limit their clinical use and potentially affect safety and efficacy for patients. Despite extensive research, some factors contributing to the immunogenicity of therapeutic antibodies remain poorly understood. In particular, the immunogenicity potential associated with multivalent antibody formats targeting oligomeric protein antigens has thus far received insufficient attention. Large, target-related immune complexes (TRICs) may be formed that can trigger Fc-mediated downstream effects and have the potential to contribute to the development of an ADA response. Here, we present experimental evidence highlighting the roles of epitope, paratope, and binding geometry in defining the composition and size distribution of TRICs formed by IL-17A, a homodimeric cytokine, with four clinical anti-IL-17 antibodies, secukinumab (Cosentyx(Ⓡ)), ixekizumab (Taltz(Ⓡ)), bimekizumab (Bimzelx(Ⓡ)) and CJM112. Widely different ADA incidence rates have been reported for these antibodies. We found that all four antibodies formed closed-chain TRICs, each comprising two or more IgG molecules connected by an equivalent number of IL-17A homodimers. Secukinumab, the antibody with the lowest ADA incidence rate, uniquely exhibited primarily 2 + 2 closed-chain complexes. In contrast, CJM112 and bimekizumab showed higher amounts of 3 + 3 and 4 + 4 complexes. Additionally, CJM112, and to a greater extent, bimekizumab and ixekizumab, formed very high molecular weight TRICs. Our findings underscore the importance of conducting in-depth biophysical analyses of TRICs formed by therapeutic antibody candidates targeting multivalent protein antigens, to develop safer and more efficacious treatments. IL-17A complexes with therapeutic antibodies exhibit distinct size distributions, potentially contributing to clinically observed immunogenicity.,Ungan D, Be C, Baczyk P, Mittermeier S, Lehmann S, Wiesmann C, Huber T, Kolbinger F, Rondeau JM MAbs. 2025 Dec;17(1):2575840. doi: 10.1080/19420862.2025.2575840. Epub 2025 Oct , 19. PMID:41111004 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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