Stabilisation of the type I β-turn conformation by a bicyclic analogue of proline
作者:Ana M. Gil、Elena Buñuel、Ana I. Jiménez、Carlos Cativiela
DOI:10.1016/s0040-4039(03)01475-8
日期:2003.8
A highly constrained analogue of l-proline, (1S,2S,4R)-2-phenyl-7-azabicyclo[2.2.1]heptane-1-carboxylic acid, has been incorporated into a model dipeptide. X-Ray diffraction analysis has shown that, in the solid state, this constrained peptide adopts a type I β-turn whereas the analogous dipeptide sequence incorporating l-proline has been shown to accommodate a βII-turn disposition. Attractive interactions
已将高度脯氨酸的脯氨酸(1 S,2 S,4 R)-2-苯基-7-氮杂双环[2.2.1]庚烷-1-甲酸类似物掺入模型二肽中。X-射线衍射分析表明,在固体状态下,该受约束的肽采用I型β-转角,而掺有I-脯氨酸的类似二肽序列已显示出可适应βII-转角。涉及中间NH基团与芳香环或金字塔型自行车氮的有吸引力的相互作用似乎在观察到的βI-转角构象的稳定中起作用。