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Summary Immunofocusing on conserved, subdominant epitopes is critical for vaccines against highly diverse viruses such as HIV-1, influenza, and SARS-CoV-2. The eight-residue N-terminus of the HIV-1 fusion peptide (FP) is one such example of a promising yet small target. We developed new FP immunogens using three alphavirus-like particles (VLPs) and introduced additional glycans to mask shared carrier-specific epitopes. In two independent guinea pig studies, sequential immunization with heterologous carriers enhanced FP-directed antibody titers, which were further improved with glycan engineering. Separately, using diverse FP variants sharing the same N-terminal six amino acids increased neutralizing antibody titers. When combined, these two strategies led to higher FP-directed titers and, after Env trimer boosting, induced FP-directed neutralizing antibodies against multi-clade wild-type HIV-1 in nearly all animals. These findings established the importance of minimizing recurrent off-target epitopes across immunizations and support the engineered VLPs as a promising platform for peptide immunization. HighlightsNovel HIV-1 fusion peptide immunogens using glycan-engineered alphavirus-like particlesImproved FP-directed response by minimizing recurrent carrier-specific epitopes across immunizationsImproved neutralizing response by sequential immunization with diverse FP variantsFP-directed antibodies neutralizing multi-clade wildtype viruses in nearly all animalsmore » « lessFree, publicly-accessible full text available May 5, 2026
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