Synthesis and Conformational Preferences of a Potential β-Sheet Nucleator Based on the 9,9-Dimethylxanthene Skeleton
作者:Kurt McWilliams、Jeffery W. Kelly
DOI:10.1021/jo9605758
日期:1996.1.1
5-disubstituted-9,9-dimethylxanthene-based amino acid (10) has been synthesized for incorporation into peptide sequences which have a propensity to adopt beta-sheet structure. Molecular dynamics studies support the FT-IR and NMR results which demonstrate that amides based on this residue utilize the NH and the C=O from the xanthene residue to form an intramolecular hydrogen bond (13-membered ring), unlike
已经合成了一种4,5-二取代的9,9-二甲基x吨基氨基酸(10),用于掺入具有采用β-折叠结构倾向的肽序列中。分子动力学研究支持FT-IR和NMR结果,结果表明,基于该残基的酰胺利用utilize吨残基中的NH和C = O形成分子内氢键(13元环),这与之前研究的二苯并呋喃-基氨基酸残基,其中连接的酰胺基团的NH和C = O参与分子内氢键键合(15元环)。有趣的是,衍生为简单酰胺的残基10倾向于采用反式构型,其中脂族侧链位于9,9-二甲基x吨环系平面的相对两侧。这与基于二苯并呋喃的氨基酸的构象偏好不同,后者基于顺式构象,该顺式构象已预先组织成核形成β-折叠。有趣的是,这些构象差异如何影响水溶液中的成核作用。