氨基酸的光化学诱导动态核极化

维生素B₂与氨基酸和氨基酸衍生物水溶液体系的光化学诱导动态核极化(photo chemically induced dynamic nuclear polarization, CIDNP)研究表明,在维生素B₂作为光敏化剂的体系中,N-乙酰-L-酪氨酸和N_α-乙酰-L-组氨酸显示很强的极化信号,而其它氨基酸和衍生物则未观察到。     

THE ATTACHMENTS OF PHYCOBILINS TO CYSTEINYL RESIDUES

The attachments of phycobilins to cysteinyl residues have been worked out through the reactions of phycoerytbrobilin dimethyl ester and phycocyanobilin dimethyl ester with cysteine methyl ester and reduced glutathione dimethyl ester respectively. A series of model compounds which carry the same conjugative skeletons as the chromophores in phycobillproteins have been purified anti identified. These compounds are characterized with strong fluorescence emission and circular dichroism effects which appeared weaker for the common bilinoid chromophores. Analyses of the circular dichroism effects of these compounds indicated that the major reaction products of phycobilins with cysteine methyl ester and reduced glutathione dimethyl ester carried the same stereochemical configuration as the chromophores in phvcobilinoroteins     

藻胆色素与半胱氨酸残基的结合

本文对藻胆色素与半胱氨酸残基的结合反应进行了试验,通过藻红胆素二甲酯、藻蓝胆素二甲酯分别与半胱氨酸甲酯、谷胱甘肽(还原型)二甲酯的反应得到了一些与藻胆蛋白上发色团具有相同共价结构的化合物。这些化合物与其他胆色素类化合物不同的是有很强的荧光发射和圆二色效应。化合物的圆二色效应分析表明,藻胆色素与半胱氨酸甲酯、谷胱甘肽(还原型)二甲酯反应时得到的产量较大的异构体与藻胆蛋白上的发色团具有相同的立体结构。