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Co‐infection with the human pegivirus 1 (HPgV‐1) often has a beneficial effect on disease progression in HIV‐1‐infected individuals. Several HPgV‐1 proteins and peptides, including a 20‐mer peptide (P6‐2) derived from the N‐terminal region of the HPgV‐1 surface protein E2, have been associated with this phenomenon, which is referred to as viral interference. We identified the cysteine residues, the hydrophobic core tetrapeptide, as well as the C‐terminal negative charge as key factors for the HIV‐1 inhibitory activity of P6‐2. Analysis of mutations in P6‐2‐resistant HIV‐1 indicated a binding site for the peptide in the HIV‐1 envelope glycoprotein gp120. In fact, P6‐2 was shown to bind to soluble gp120, as well as to a peptide presenting the gp120 V3 loop. Furthermore, the HIV‐1 inhibitory activity of P6‐2 could be revoked by the V3 loop peptide, thus indicating a molecular mechanism that involves interaction of P6‐2 with the gp120 V3 loop.

chemmedchem

Exploring Viral Interference Using Peptides: Molecular Determinants of HIV‐1 Inhibition by a Peptide Derived from Human Pegivirus‐1 Envelope Protein E2