Development of a cyclic peptide inhibitor of the p6/UEV protein- protein interaction

Abstract

The budding of HIV from infected cells is driven by the protein-protein interaction between the p6 domain of the HIV Gag protein and the UEV domain of the human TSG101 protein. We report the development of a cyclic peptide inhibitor of the p6/UEV interaction, from a non cell-permeable parent that was identified in a SICLOPPS screen. Amino acids critical for the activity of the parent cyclic peptide were uncovered using alanine-scanning, and a series of non-natural analogues synthesized and assessed. The most potent molecule disrupts the p6/UEV interaction with an IC50 of 6.17 ± 0.24 μM by binding to UEV with a Kd of 11.9 ± 2.8 μM. This compound is cell permeable and active in a cellular virus-like particle budding assay with an IC50 of ∼2 μM. This work further demonstrates the relative simplicity with which the potency and activity of cyclic peptides identified from SICLOPPS libraries can be optimized.

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ORCID for Ali Tavassoli: orcid.org/0000-0002-7420-5063

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