Characterization of the reactivity of luciferin boronate - A probe for inflammatory oxidants with improved stability
作者:Marcin Szala、Aleksandra Grzelakowska、Julia Modrzejewska、Przemysław Siarkiewicz、Daniel Słowiński、Małgorzata Świerczyńska、Jacek Zielonka、Radosław Podsiadły
DOI:10.1016/j.dyepig.2020.108693
日期:2020.12
other boronate probes, LBA is oxidized by peroxynitrite in two pathways. Luc-OH is the product of the major pathway, common for all the oxidants tested, whereas the non-fluorescent nitrated derivative, Luc-NO2, is formed in the minor pathway, specific for peroxynitrite. Formation of luciferin radical intermediate in the minor pathway has been confirmed by EPR spin trapping and mass spectrometric analyses
荧光素的硼酸酯衍生物,其包含氧化剂活化的自消灭部分,最近已被开发用于动物模型中过氧化氢的生物发光检测。在这里,我们报告萤光素硼酸频哪醇酯(LBE)的合成和表征,作为用于检测过氧化氢,次氯酸和过亚硝酸盐的探针,具有改善的稳定性和响应时间。HPLC分析表明,LBE在磷酸盐缓冲液中迅速水解为萤光素硼酸(LBA)。过氧化氢缓慢氧化LBA,形成萤光素酶底物萤光素(Luc-OH)作为唯一产物。次氯酸盐还可以将LBA氧化为荧光素,但随后的Luc-OH与次氯酸盐反应生成了氯化的荧光素Luc-OH-Cl,在pH 7时其荧光量子产率高于荧光素。图4中所示的底物也是萤光素酶的底物(Takakura H等人,ChemBioChem 2012; 13:1424)。与其他硼酸盐探针相似,LBA在两个途径中被过亚硝酸盐氧化。Luc-OH是主要途径的产物,对于所有测试的氧化剂而言都是相同的,而非荧光硝化衍生物Luc-NO