Selective N-acylation of aminoglycoside antibiotics with the N-hydroxysuccinimide ester of methyldithioacetic acid, followed by reaction with methanethiol or dithioerythritol, gives sulfhydryl labeled antibiotics. Alternatively, the nucleophilic sulfhydryl group is incorporated into an antibiotic by treatment with N-acetyl-d,l-homocysteine thiolactone. These derivatives couple readily with proteins that have previously been modified with bromoacetylglycyl groups to provide conjugates for use in the development of homogeneous enzyme immunoassays.
氨基糖苷抗生素的选择性N-酰化,使用甲基二
硫乙酸的N-羟基琥珀
酰亚胺酯,随后与
甲硫醇或二
硫巴比妥醇反应,可制备含
硫巯基标记的抗生素。或者,通过与N-乙酰-d,l-同型半胱
氨酸
硫内酯处理,将亲核
硫巯基基团引入抗生素中。这些衍
生物可与之前用
溴乙酰甘
氨酰基修饰过的蛋白质轻松偶联,用于开发均相酶免疫分析的共轭物。