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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,5,5]]},"abstract":"<jats:p>Germline targeting vaccination strategies against highly variable pathogens such as HIV aim to elicit broadly neutralizing antibodies (bnAbs) with particular immunogenetic or structural features. The V2 apex of the HIV Env protein is a promising target for a class of bnAbs that contain conserved structural motifs in the heavy chain complementarity determining region 3 (CDRH3). Here, we show that these structural motifs are targetable by vaccination by characterizing V2 apex \u201caxe-like\u201d CDRH3s in the human repertoire and developing immunogens capable of engaging them. We determined the frequency and diversity of axe-like CDRH3s in healthy human donors using a series of structural informatics approaches, finding these precursors in nearly 90% of donors. Axe-targeting immunogens based on the HIV Env Q23.17 bound axe-like precursors in cryo-electron microscopy structures, induced V2 apex-specific antibody responses in humanized mice, and induced axe-like heterologous neutralizing antibodies in rhesus macaques infected with a germline-targeted simian-HIV. These results illustrate a structure-guided immunoinformatic vaccine design paradigm that can be employed to elicit immunogenetically diverse yet structurally conserved classes of antibodies.<\/jats:p>","DOI":"10.1073\/pnas.2532810123","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T17:37:36Z","timestamp":1777484256000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":4,"title":["Deep mining of the human antibody repertoire identifies frequent and genetically diverse CDRH3 topologies targetable by vaccination"],"prefix":"10.1073","volume":"123","author":[{"given":"Rumi","family":"Habib","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04wncat98","id-type":"ROR","asserted-by":"publisher"}],"name":"Vaccine and Immunotherapy Center, The Wistar Institute","place":["Philadelphia"]},{"name":"Department of Medicine, Perelman School of Medicine, University of 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coevolution identifies B cell priming as the principal bottleneck to HIV-1 V2 apex broadly neutralizing antibody development","volume":"11","author":"Habib R.","year":"2026","unstructured":"R. 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