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• W2045923350 abstract "Pol peptide, an oligopeptide corresponding to the 27 C-terminal amino acids of DNA polymerase from herpes simplex virus type 1, has recently been suggested to translocate from endosomal compartments into the cytosol after being intracellularly delivered via a protein carrier. While an acidic environment was thought to be important for Pol peptide membrane translocation, the mechanism of translocation remains unclear. To investigate the influence of an acidic environment on the conformational properties of the peptide and on its propensity to interact with lipid bilayers, we characterized the structure of Pol peptide at different pH values by both circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopy. The influence of detergent micelles, which mimic biological lipid membranes, on the peptide secondary structure was also studied. Our CD results indicate that the peptide is in a random conformation in aqueous solution at both acidic and basic pH, whereas in the presence of dodecylphosphocholine (DPC) micelles, it assumes a partial α-helical structure which is significantly pH-dependent. An NMR study confirmed that, in the presence of DPC micelles, a short C-terminal α-helix is present at pH 6.5, whereas almost two-thirds of the peptide (residues 10−26) fold into an extended amphipathic α-helix at pH 4.0. The orientation of Pol peptide relative to the DPC micelle was investigated using paramagnetic probes at both pH 4.0 and 6.5. These studies show that the peptide inserts deeply into the micelle at pH 4.0, whereas it is more exposed to the aqueous environment at pH 6.5. On the basis of these results, a model which might explain the mechanism of translocation of Pol peptide from acidic endosomes to the cytosol is discussed." @default.
• W2045923350 created "2016-06-24" @default.
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• W2045923350 date "2004-07-01" @default.
• W2045923350 modified "2023-10-16" @default.
• W2045923350 title "pH-Dependent Conformational Changes and Topology of a Herpesvirus Translocating Peptide in a Membrane-Mimetic Environment" @default.
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• W2045923350 doi "https://doi.org/10.1021/bi0496438" @default.
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