Biological interactions of fluorinated chalcones: Stimulation of tyrosinase activity and binding to bovine serum albumin
作者:Otávio Augusto Chaves、Leonardo Santos de Barros、Márcia C.C. de Oliveira、Carlos Mauricio R. Sant’Anna、Aurélio B.B. Ferreira、Francisco Assis da Silva、Dari Cesarin-Sobrinho、José Carlos Netto-Ferreira
DOI:10.1016/j.jfluchem.2017.04.007
日期:2017.7
chalcone and BSA. On the other hand, for the fluorinated derivatives CH3F, CH4F and CH2356F Ka = 104 M−1, which indicates that the presence of fluorine atoms on the chalcone structure decreases the binding ability. The thermodynamic parameters ΔH° and ΔS° show that the BSA:CH association is enthalpically and entropically driven, whereas for fluorinated derivatives it is only entropically driven. The negative
评估PBS缓冲溶液(pH =)中CH,CH3F,CH4F,CH23F,CH25F,CH35F和CH2356F的酪氨酸酶活性以及CH和氟化查耳酮CH3F,CH4F和CH2356F与牛血清白蛋白(BSA)的相互作用7.4)分别在288 K,293 K和298 K上使用光谱技术,ζ电位和计算方法进行了研究。酪氨酸酶活性通过UV-vis的氧化法测定升-DOPA在酶和查耳酮存在下:未取代的查尔酮抑制酪氨酸酶活性,而其氟化衍生物显示相反的作用,其样品CH2356F显示出最高的活化百分比。CH,CH3F,CH4F和CH2356F对BSA荧光的猝灭研究表明,静态和动态猝灭机制相结合。此外,FRET机制的发生可能性很高。对于CH,结合常数(K a)在10 5 M -1的范围内,表明查耳酮和BSA之间的中等结合。在另一方面,对于氟化衍生物CH3F,CH4F和CH2356F ķ一个 = 10 4 中号-1,这