CD of proline‐rich polypeptides: Application to the study of the repetitive domain of maize glutelin‐2

An overview of CD of proline‐rich peptides is reported. First, structural characteristics, theoretical CD studies, and the biological relevance of polyproline II structure in such peptides are discussed. Second, a CD study of peptides belonging to the repetitive domain of maize glutelin‐2, H‐(Val‐His‐Leu‐Pro‐Pro‐Pro)n‐OH (n = 3, 5, 8), is described. This series of peptides displayed the CD features of polyproline II structure in water (5°C, pH5). Moreover, it was shown that the addition of increasing amounts of the polyanionic molecule heparin forced a displacement of the conformational equilibrium of those peptides toward higher proportions of the polyproline II structure. In contrast, when the temperature is raised such a structure gradually disappears, leading to more disordered conformations. © 1993 John Wiley & Sons, Inc.

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