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首页> 外文期刊>Bioorganic and Medicinal Chemistry Letters >Labeling study of avidin by modular method for affinity labeling (MoAL).
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Labeling study of avidin by modular method for affinity labeling (MoAL).

机译:通过亲和标记(MoAL)的模块化方法对亲和素进行标记研究。

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We studied the specific labeling of avidin with biotinylated modular ligand catalysts via MoAL, which we recently established. The labeling yield was found to depend on the linker length connecting the catalytic site to biotin in the modular ligand catalyst 1, and the maximum yield was obtained with 1d possessing octamethylene linker. The labeling reaction reached a maximum rate with only 4 equiv of the ligand catalyst. Presumably, all the subunits of avidin with homotetrameric structure formed a stable complex with 4 equiv of the catalyst because of the extremely high affinity. The ligand catalyst bound to avidin first catalyzed N-triazinylation of the epsilon-amino group of Lys111, and the resulting regenerated catalyst then catalyzed the reaction of Asp108 and CDMT.
机译:我们通过最近建立的MoAL研究了生物素化模块化配体催化剂对亲和素的特异性标记。发现标记产率取决于模块配体催化剂1中将催化位点连接至生物素的接头长度,并且使用具有八亚甲基接头的1d可获得最大产率。仅用4当量的配体催化剂,标记反应达到最大速率。据推测,由于具有极高的亲和力,具有均四聚体结构的抗生物素蛋白的所有亚基与4当量的催化剂形成稳定的络合物。与抗生物素蛋白结合的配体催化剂首先催化Lys111的ε-氨基的N-三叠氮化,然后生成的再生催化剂则催化Asp108与CDMT的反应。

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