Optimal N-Caps for N-Terminal Helical Templates: Effects of Changes in H-Bonding Efficiency and Charge
作者:Wolfgang Maison、Eva Arce、Peter Renold、Robert J. Kennedy、Daniel S. Kemp
DOI:10.1021/ja010812a
日期:2001.10.1
formation. Replacement of the N-acetyl by urethane, urea, or sulfonamide generated less efficient polypeptide helix inducers. The N-formyl cap is found to be equivalent to the N-acetyl and may provide more convenient quantitative helix reporting properties. Anionic N-caps derived from the series X = (-)O(2)C-(CH(2))(n)-CO, 0 < or = n < or = 3, are superior to N-acetyl, as are N-acylglycyl and N-acyl-beta-aspartyl
引入了一系列有效的螺旋起始 N 端帽 X-Hel,扩展了先前报告的构象模板 Ac-Hel 的范围和多功能性,(Kemp, DS; Allen, TJ; Oslick, SJ Am. Chem. Soc . 1995, 117, 6641-6657) 并且描述了基于结构特异性分子内氢键形成预测帽盖性能的工作原理。用氨基甲酸乙酯、尿素或磺酰胺替代 N-乙酰基会产生效率较低的多肽螺旋诱导剂。发现 N-甲酰基帽等同于 N-乙酰基,可以提供更方便的定量螺旋报告特性。衍生自系列 X = (-)O(2)C-(CH(2))(n)-CO, 0 < 或 = n < 或 = 3 的阴离子 N-帽优于 N-乙酰基,正如N-酰基甘氨酰和 N-酰基-β-天冬氨酰。后一对帽允许在多肽链内引入 X-Hel 功能,从而控制肽子序列的螺旋度。讨论了这些上限函数的应用。这项工作主要侧重于直接的实际目标,旨在提高水溶液中分离的中