Aminopropargyl derivative of terpyridine-bis(methyl-enamine) tetraacetic acid chelate of europium (Eu (TMT)-AP3): a new reagent for fluorescent labelling of proteins and peptides
作者:S?verine Poupart、C?dric Boudou、Philippe Peixoto、Marc Massonneau、Pierre-Yves Renard、Anthony Romieu
DOI:10.1039/b612805j
日期:——
The synthesis and photophysical properties of a new terpyridine-based europium(III) chelate (Eu (TMT)-AP3) designed for peptide and protein labelling in aqueous solution phase is described. In order to obtain a stable, easy to handle, versatile and efficient labelling agent, a reactive aminopropargyl arm has been introduced onto the terpyridine moiety. As preliminary biochemical applications the chelate has been 1) efficiently covalently attached onto a representative biomolecule—monoclonal antibody—and 2) converted into iodoacetamido and aldehyde derivatives, and the photoluminescent Eu (TMT)-AP3 was grafted onto cysteine and lysine amino acid residues respectively. These two different solution phase labelling methods yielded original fluorogenic FRET based probes suitable for “in vitro” detection of caspase-3 protease, a key mediator of apoptosis of mammalian cells.
本文介绍了一种新的基于铽吡啶的铕(III)螯合物(Eu (TMT)-AP3)的合成和光物理特性,该螯合物专为在水溶液相中标记肽和蛋白质而设计。为了获得一种稳定、易于处理、用途广泛且高效的标记剂,在terpyridine分子上引入了一个反应性氨基丙炔基臂。作为初步的生化应用,螯合物已被 1) 高效地共价连接到代表性生物大分子--单克隆抗体上,2) 转化为碘乙酰胺基和醛基衍生物,光致发光 Eu (TMT)-AP3 则分别接枝到半胱氨酸和赖氨酸氨基酸残基上。这两种不同的溶液相标记方法产生了基于 FRET 的原始荧光探针,适用于 "体外 "检测哺乳动物细胞凋亡的关键介质--caspase-3 蛋白酶。