Design and synthesis of alpha Gal-conjugated peptide T20 as novel antiviral agent for HIV-immunotargeting |
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Authors: | Naicker Kannan P Li Hengguang Heredia Alonso Song Haijing Wang Lai-Xi |
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Affiliation: | Institute of Human Virology, University of Maryland Biotechnology Institute, University of Maryland, Baltimore, MD 21201, USA. |
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Abstract: | An efficient chemo-enzymatic synthesis of alpha Gal-conjugated peptide T20 as novel HIV-immuno-targeting agent is described. The synthesis involves chemo-enzymatic preparation of maleimide-functionalized alpha Gal epitope and its chemoselective ligation with the peptide T20. The title compound contains two functional domains: the trisaccharide alpha Gal epitope that binds to human natural anti-Gal antibodies and the 36-amino acid gp41 peptide (T20) that recognizes the gp41 N-terminal ectodomain of the HIV envelope. Biological assays demonstrated that the synthetic conjugate could readily bind to natural anti-Gal antibodies (both IgG and IgM type) in normal human serum and exhibited potent anti-HIV activity even in the absence of human antibodies and complement system. The experimental data suggest that the synthetic alpha Gal-T20 might be valuable for in vivo HIV-immuno-targeting via antibody-mediated cytotoxicity and/or antibody-dependent, complement-mediated lysis of HIV particles and HIV-infected cells, thus providing an additional dimension of HIV intervention. |
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