A cross-protective mAb recognizes a novel epitope within the flavivirus NS1 protein Lee, Tae Hee and Song, Byung-Hak and Yun, Sang-Im and Woo, Hye Ryun and Lee, Young-Min and Diamond, Michael S. and Chung, Kyung Min,, 93, 20-26 (2012), doi = https://doi.org/10.1099/vir.0.036640-0, publicationName = Microbiology Society, issn = 0022-1317, abstract= Despite a resurgence of flavivirus infections worldwide, no approved therapeutic agent exists for any member of the genus. While cross-reactive antibodies with therapeutic potential against flaviviruses have been generated, the majority of them are anti-E antibodies with the potential to cause antibody-dependent enhancement of flavivirus infection and disease. We described previously mAbs against the non-structural NS1 protein of the West Nile virus (WNV) that were protective in mice when administered pre- or post-infection of WNV. Here, we demonstrate that one of these mAbs (16NS1) cross-reacted with Japanese encephalitis virus (JEV) and exhibited protective activity against a lethal JEV infection. Overlapping peptide mapping analysis combined with site-specific mutations identified a novel epitope 116KAWGKSILFA125 and critical amino acid residues (118W and 122I) for 16NS1 mAb binding. These results may facilitate the development of a broadly therapeutic mAb that lacks enhancing potential and/or subunit-based vaccine against flaviviruses that target the NS1 protein., language=, type=