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HIV gp120 (318-327) is a short sequence of the HIV-1 strain IIIB envelope peptide (rgpgrafvti) that corresponds to the conserved C-terminal region of the glycoprotein. HIV gp120 (318-327) is part of the HIV vaccine V3 peptide epitope, also known as the I10 peptide. However, HIV gp120 (318-327) lacks the A2 anchor residues recognized by epitope-specific CTLs but has structural features that confer promiscuous A2 binding[1][2].

[1] Kmieciak D, et al. The effect of deletion of the V3 loop of gp120 on cytotoxic T cell responses and HIV gp120-mediated pathogenesis. J Immunol. 1998 Jun 1;160(11):5676-83. PMID:9605175
[2] Gu L, et al. A recombinant adenovirus-based vector elicits a specific humoral immune response against the V3 loop of HIV-1 gp120 in mice through the "Antigen Capsid-Incorporation" strategy. Virol J. 2014 Jun 16;11:112. DOI:10.1186/1743-422X-11-112