Two new 35S reagents were developed to radiolabel proteins. The first reagent, N-succinimidyl-4-(methane [35S]sulfonylamino-methyl)-benzoate (SMSB), acylates the ε-amino group of lysine residues in proteins. The second reagent, 4-(methane [35S]sulfonylamino-methyl)-phenylpropylaldehyde (MSAPPA), labels lysine residues via reductive alkylation. Comparing the two methods, the reductive alkylation method labeled proteins over a broader pH range with higher overall radiochemical yield. More than ten monoclonal antibodies (mAbs) have been labeled with these 35S labeling reagents, the biological activity of the mAbs was unchanged. Part of this work was presented in the Ninth International Symposium on the Synthesis and Applications of Isotopically Labelled Compounds, Edinburgh, 16–20 July 2006. Copyright © 2009 John Wiley & Sons, Ltd.
开发了两种新的35S试剂用于放射标记蛋白质。第一种试剂是N-琥珀
酰亚胺-4-(
甲烷[35S]磺酰
氨基甲基)
苯甲酸(SMSB),它对蛋白质中的赖
氨酸残基的ε-
氨基进行酰化。第二种试剂是4-(
甲烷[35S]磺酰
氨基甲基)苯基
丙醛(M
SAPPA),它通过还原性烷基化对赖
氨酸残基进行标记。比较这两种方法时,还原性烷基化方法在更广泛的pH范围内标记蛋白质,且总体放射
化学产率更高。已有超过十种单克隆
抗体(mAbs)被这些35S标记试剂标记,且mAbs的
生物活性未发生改变。部分研究成果在2006年7月16日至20日于爱丁堡举行的第九届同位素标记化合物的合成与应用国际研讨会上进行了展示。版权 © 2009 John Wiley & Sons, Ltd.