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• W1666256192 abstract "In HIV the viral envelope protein is processed by a host cell protease to form gp120 and gp41. The C1 and C5 domains of gp120 are thought to directly interact with gp41 but are largely missing from the available X-ray structure. Biophysical studies of the HIV gp120 C5 domain (residues 489–511 of HIV-1 strain HXB2), which corresponds to the carboxy terminal region of gp120, have been undertaken. CD studies of the C5 domain suggest that it is unstructured in aqueous solutions but partially helical in trifluoroethanol/aqueous and hexafluoroisopropanol/aqueous buffers. The solution structure of the C5 peptide in 40% trifluoroethanol/aqueous buffer was determined by NMR spectroscopy. The resulting structure is a turn helix structural motif, consistent with the CD results. Fluorescence titration experiments suggest that HIV C5 forms a 1 : 1 complex with the HIV gp41 ectodomain in the presence of cosolvent with an apparent Kd of ≈ 1.0 µm. The absence of complex formation in the absence of cosolvent indicates that formation of the turn-helix structural motif of C5 is necessary for complex formation. Examination of the C5 structure provides insight into the interaction between gp120 and gp41 and provides a possible target site for future drug therapies designed to disrupt the gp120/gp41 complex. In addition, the C5 structure lends insight into the site of HIV envelope protein maturation by the host enzymes furin and PC7, which provides other possible targets for drug therapies." @default.
• W1666256192 created "2016-06-24" @default.
• W1666256192 creator A5019348558 @default.
• W1666256192 creator A5082200262 @default.
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• W1666256192 date "2002-09-18" @default.
• W1666256192 modified "2023-10-04" @default.
• W1666256192 title "Solution structure of the HIV gp120 C5 Domain" @default.
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• W1666256192 doi "https://doi.org/10.1046/j.1432-1033.2002.03187.x" @default.
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