We demonstrate that dibenzocyclooctendiones (DBCDOs) are efficient chemical reagents for the site-specific labeling of arginine-containing biomolecules. Unlike the commonly used probes, DBCDOs undergo an irreversible ring-contracted rearrangement with the guanidinium group on arginine residues under mild reaction conditions. The regioselective dual-labeled arginine residues were obtained in a one-pot reaction with our tested substrates. The efficiency of DBCDOs reactions and their ease of synthesis make DBCDOs an attractive choice for the site-selective bioconjugation of arginine.

中文翻译：

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二苯并环辛烯二酮 (DBCDO)：通过苯甲酸重排获得的精氨酸选择性化学标记试剂

我们证明二苯并环辛二酮 (DBCDO) 是用于对含精氨酸的生物分子进行位点特异性标记的有效化学试剂。与常用的探针不同，DBCDO 在温和的反应条件下与精氨酸残基上的胍基团发生不可逆的缩环重排。区域选择性双标记精氨酸残基是在与我们测试的底物的一锅反应中获得的。DBCDOs 反应的效率及其易于合成使 DBCDOs 成为精氨酸位点选择性生物共轭的有吸引力的选择。