Kinetics and mechanism of transamination reaction of L-phenylalanine with hydrophobic pyridoxal in vesicular and micellar phases
作者:Yukito Murakami、Jun-ichi Kikuchi、Kazunari Akiyoshi、Toru Imori
DOI:10.1039/p29860001445
日期:——
afford the pyridoxamine derivative (PM +2C16) and β-phenylpyruvic acid, addition of metal ions to the equilibrium mixture of the aldimine Schiff's base (ASB), PL +2C16, and L-Phe caused acceleration of the overall transamination rate. The transmination was most effectively catalysed by copper(II) ions in the N+C5Ala2C16 vesicle and the CTAB micelle. The catalytic activity of copper(II) ions was so enhanced
在吡啶基的氮与双链段(PL季铵化疏水吡哆醛衍生物+ 2C 16)包埋在的单壁囊泡NN -dihexadecyl- Ñ α - [6-(三甲基铵基)己酰基] -L-溴化丙氨酰胺(N + C 5 Ala2C 16),吡ido醛部分固定在囊泡的氢带结构域中。当L-苯丙氨酸(L -Phe),一种疏水性α-氨基酸,囊泡中的PL + 2C 16和十六烷基三甲基溴化铵(CTAB)胶束的氨基转移缓慢进行时,得到了吡ido胺衍生物(PM+ 2C 16)和β-苯基丙酮酸,向亚胺基希夫碱(ASB),PL + 2C 16和L -Phe的平衡混合物中添加金属离子,会加快总体氨基转移速率。在N + C 5 Ala2C 16囊泡和CTAB胶束中,铜( II)离子最有效地催化了这种转化。铜( II)离子的催化活性得到增强,以至于大量积累的碳负离子螯合物(通过α-氢去除从ASB螯合物中衍生出来)作为醛亚胺-酮亚胺异构化的中间体。总体铜的反应性(