Synthesis and properties of the red chromophore of the green-to-red photoconvertible fluorescent protein Kaede and its analogs
作者:Ilia V. Yampolsky、Alexander A. Kislukhin、Tynchtyk T. Amatov、Dmitry Shcherbo、Victor K. Potapov、Sergey Lukyanov、Konstantin A. Lukyanov
DOI:10.1016/j.bioorg.2007.12.003
日期:2008.4
describe synthesis of Kaede red chromophore (2-[(1E)-2-(5-imidazolyl)ethenyl]-4-(p-hydroxybenzylidene)-5-imidazolone) and its analogs that can be potentially formed by natural amino acid residues. Chromophores corresponding to the following tripeptides were obtained: His-Tyr-Gly, Trp-Tyr-Gly, Phe-Trp-Gly, Tyr-Trp-Gly, Asn-Tyr-Gly, Phe-Tyr-Gly, and Tyr-Tyr-Gly. In basic conditions they fluoresced red with
绿色荧光蛋白(GFP)和同源蛋白具有基于自身氨基酸残基的自催化修饰的独特的发色团形成途径。绿红光转换荧光蛋白 Kaede 携带 His-Tyr-Gly 发色团形成三联体。在这里,我们描述了 Kaede 红色发色团 (2-[(1E)-2-(5-咪唑基)乙烯基]-4-(对羟基苯亚甲基)-5-咪唑啉酮) 及其可能由天然氨基形成的类似物的合成酸残留物。获得了对应于以下三肽的发色团:His-Tyr-Gly、Trp-Tyr-Gly、Phe-Trp-Gly、Tyr-Trp-Gly、Asn-Tyr-Gly、Phe-Tyr-Gly 和 Tyr-Tyr-甘氨酸。在碱性条件下,它们发出红色荧光,量子产率相对较高(色氨酸衍生化合物高达 0.017)。在碱性 DMSO 中,发色团 Trp-Tyr-Gly 在 595 nm 处发现了最大红移吸收峰。令人惊讶的是,在碱性 DMF 中,非芳香族 Asn 衍生的发色团 Asn-Tyr-Gly