Three water-soluble bovine serum albumin derivatives with carboxyl spacer groups have been synthesized as carrier proteins for direct preparation of conjugates between proteins and low molecular haptens with amino groups. N-Glycylaminomethanesulfonic acid, a newly developed solubilizing reagent for proteins, was first introduced into bovine serum albumin through its carboxyl groups. After the methylation of carboxyl groups remaining unreacted in the modified albumin, N-succinylglycine and N-bromoacetyl-β-alanine, both carboxyl spacer reagents, were reacted with the amino or imidazole groups of the modified albumin, respectively, to give two water-soluble albumin derivatives. Another water-soluble albumin derivatives. Another water-soluble albumin derivative was obtained by treating the modified albumin with N-bromoacetyl-β-alanine followed by amidination of the remaining amino groups of the albumin with methylacetimidate. Glycine ethyl ester, selected as a model hapten that has an amino group, was reacted with these albumin derivatives to form conjugates, and 4-15 ester moieties can be incorporated into one molecule of the albumin derivatives without loss of their water-solubility.
合成了三种带有羧基间隔基团的
水溶性
牛血清白蛋白衍
生物作为载体蛋白,用于直接制备蛋白质与带有
氨基的低分子半抗原之间的缀合物。 N-甘
氨酰
氨基甲磺酸是一种新开发的蛋白质溶解试剂,首次通过其羧基引入
牛血清白蛋白中。修饰白蛋白中未反应的羧基甲基化后,N-琥珀酰甘
氨酸和N-
溴乙酰基-
β-丙氨酸(两种羧基间隔试剂)分别与修饰白蛋白的
氨基或
咪唑基团反应,得到两种
水-可溶性白蛋白衍
生物。另一种
水溶性白蛋白衍
生物。另一种
水溶性白蛋白衍
生物是通过用N-
溴乙酰基-
β-丙氨酸处理修饰的白蛋白,然后用乙酰亚
氨酸甲酯对白蛋白的剩余
氨基进行脒化而获得的。选择甘
氨酸
乙酯作为具有
氨基的模型半抗原,与这些白蛋白衍
生物反应形成缀合物,并且4-15个酯部分可以掺入到白蛋白衍
生物的一个分子中而不损失其
水溶性。