作者:Nicola Angelini、Norberto Micali、Placido Mineo、Emilio Scamporrino、Valentina Villari、Daniele Vitalini
DOI:10.1021/jp052408u
日期:2005.10.1
(Co-P) and aromatic alpha-L-amino acids (Trp and Phe) give direct evidence for the coordination between the Co-P and amino acids. Considering that Co-P, besides the Co atom (one-fixation-point system), does not contain in the molecule active ligand groups and that no ICD signals have been observed in the case of Co-P/Ala, it has been concluded that hydrophobic interactions or stacking interactions between
对于非手性5,10,15,20-四(-ω-甲氧基聚(氧基-乙烯)]苯基}卟啉钴(II)(Co-P)和芳香族α-L-氨基酸(Trp和Phe)为Co-P和氨基酸之间的配位提供了直接证据。考虑到除Co原子(一个固定点系统)外,Co-P在分子中不包含活性配体基团,并且在Co-P / Ala的情况下未观察到ICD信号,因此得出结论卟啉的芳香环与Trp或Phe的芳香环之间的疏水相互作用或堆积相互作用,作为进一步的氨基酸(AA)固定点,可以大大降低手性客体的迁移率,因此可以产生ICD信号。还研究了pH(在2-9范围内)和氨基酸结构变化对ICD现象的影响。特别是,已观察到以下情况:(i)所有pH为7的Co-P / N-乙酰基氨基酸水溶液的强ICD信号,(ii)Co-P具有双符号形式的意外ICD带/ Ala溶液在长时间老化后的pH值为9,并且(iii)当使用alpha-D-Phe和alpha-D-Trp对