Solution State Structure of pAl, the Mimotopic Peptide of Apolipoprotein A-I, by NMR Spectroscopy

摘要

Apolipoprotein A-I (Apo A-I) is a major component for high density lipoproteins (HDL). A number of mimetic peptides of Apo A-I were screened from the phase-displayed random peptide library by utilizing monoclonal antibodies (A12). Mimetic peptide for A12 epitope against Apo A-I was selected as CPFARLPVEHHDVVGL (pA1). From the BLAST search, the mimetic peptide pAl had 40% homology with Apo A-I. As a result of the structural determination of this mimotope using homo/hetero nuclear 2D-NMR techniques and NMR-based distance geometry (DG)/molecular dynamic (MD) computations, DG structure had low penalty value of 0.3-0.7 A~2 and the total RMSD was 0.6-1.6 A. The mimotope pAl exhibited characteristic conformation including a β-turn from Pro[7] to His[l 1],