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J. Biol. Chem., Vol. 255, Issue 22, 10651-10657, 11, 1980

Chain length-function correlation of amphiphilic peptides. Synthesis and surface properties of a tetratetracontapeptide segment of apolipoprotein A-I

D Fukushima, S Yokoyama, DJ Kroon, FJ Kezdy and ET Kaiser

The segment corresponding to residues 121 to 164 of human plasma apolipoprotein A-I (apo-A-I) has been synthesized by the Merrifield solid phase method. The peptide binds to unilamellar phospholipid vesicles and to phospholipid-cholesterol mixed vesicles. The surface affinity of the peptide measured in this way indicated that the mechanism of binding is the same as that of apo A-I (144-165) and apo A- I itself. The peptide appears to be a globular monomer in a aqueous solution, with 17% alpha helix content. The peptide bound to vesicles activates lecithin:cholesterol acyltransferase: compared to apo A-I, the peptide is about 30% as efficient in the activation of cholesterol esterification and of phospholipid hydrolysis when the surface is saturated by the activator. For a variety of amphiphilic peptides and for apo A-I, the lecithin: cholesterol acyltransferase-activating ability correlates well with their alpha helix contents in 50% trifluoroethanol.
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