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• W2114580309 endingPage "4351" @default.
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• W2114580309 abstract "In terms of background, the solution structure of monomeric peptide P1 (residues 649-683), located in the conserved membrane proximal region (MPER) of HIV-1 envelope glycoprotein gp41, is first reported here in dodecylphosphocholine (DPC) micelles. P1 is the minimal MPER region that permits interaction with the mucosal galactosyl ceramide HIV-receptor; it also contains epitopes recognized by major gp41-specific, broadly neutralizing immunoglobulin Gs (IgGs), 2F5 and 4E10, determinant in HIV fusion/infection. Our principal findings were as follows: the structural stability of P1 is pH dependent, as the alpha-helix comprising Q653 I682, present at pH 3.3, is destabilized at higher pH values. At pH 6, the E-rich N-terminal half of P1 (residues 650-666), partially overlapping the 2F5-specific epitope, becomes fully disordered, while the W-rich C-terminal half conserves two shorter helices (W666-W670 and W672-W680), separated by a well-defined bend overlapped by the 4E10-specific epitope. The two IgGs bind to P1 on DPC micelles with binding parameters (K(d)) in the nanomolar range. Next, P1 was derivatized with phosphatidylethanolamine at its C terminal and inserted into liposomes of varied lipid composition, thereby enabling P1 to move laterally. Alternatively, an infectious virus-binding assay was established. The K(d) of both 2F5 and 4E10 IgGs measured on viral liposome and virus are similar and much lower than for the binding of the free peptide. In conclusion, P1, in a lipid environment, is an optimized MPER-derived peptide suitable for designing an immunogen inducing broadly neutralizing antibodies to HIV." @default.
• W2114580309 created "2016-06-24" @default.
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• W2114580309 date "2008-09-05" @default.
• W2114580309 modified "2023-10-13" @default.
• W2114580309 title "Both lipid environment and pH are critical for determining physiological solution structure of 3‐D‐conserved epitopes of the HIV‐1 gp41‐MPER peptide P1" @default.
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• W2114580309 doi "https://doi.org/10.1096/fj.08-113142" @default.
• W2114580309 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18776068" @default.
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