Download MendeleyStructural and antigen-binding surface definition of an anti-CD93 monoclonal antibody for the treatment of degenerative vascular eye diseases.
Raucci, L., Perrone, C.D., Barbera, S., de Boer, L.J., Tosi, G.M., Brunetti, J., Bracci, L., Pozzi, C., Galvagni, F., Orlandini, M.(2025) Int J Biol Macromol 309: 143118-143118
- PubMed: 40228767 Search on PubMed
- DOI: https://doi.org/10.1016/j.ijbiomac.2025.143118
- Primary Citation Related Structures:
9HY1, 9HY2, 9HY3, 9HY5 - PubMed Abstract:
CD93 is a receptor predominantly expressed on the surface of endothelial cells, where it plays a pivotal role in angiogenesis through its interaction with the extracellular matrix. In our previous studies, we identified the monoclonal antibody 4E1 as a potent inhibitor of angiogenesis by targeting the CD93-Multimerin-2 axis. Here, we report the development of 4E1 as a recombinant whole immunoglobulin and a single-chain variable fragment, designated sc-4E. Both formats retained the binding properties of the parental monoclonal antibody and exhibited comparable inhibitory effects on endothelial cell migration and differentiation. To elucidate the molecular basis of the 4E1-CD93 interaction, we initially employed machine learning-based modeling and docking analyses of the variable heavy and light domains of 4E1. Subsequent crystallographic analysis of sc-4E provided high-resolution structural insights, confirming and validating the predicted model. Further docking experiments and molecular dynamics simulations using the crystallographic structures of CD93 and sc-4E revealed that the interaction is primarily mediated by the CDR-H3 and CDR-L2 loops. Notably, these regions engage with the sushi-like domain of CD93, which is critical for its interaction with Multimerin-2. This comprehensive structural and functional characterization of 4E1 and sc-4E underscores their potential as anti-angiogenic agents. By effectively inhibiting endothelial cell migration and differentiation, 4E1 derivatives represent promising therapeutic candidates for the treatment of ocular vascular diseases driven by pathological angiogenesis.
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena 53100, Italy.
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