CN115991669A - 一类用于蛋白质半胱氨酸残基修饰的含氟标签及应用 - Google Patents
一类用于蛋白质半胱氨酸残基修饰的含氟标签及应用 Download PDFInfo
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Abstract
本发明属于蛋白质修饰技术领域,具体公开了一类用于蛋白质半胱氨酸残基修饰的含氟标签及应用。本发明利用砜基化合物与巯基的特异性反应构建了水溶性19F标签,该标签能够在温和条件下实现半胱氨酸残基的修饰,形成稳定的碳硫键,标记的蛋白质有效地降低了蛋白质的核磁共振检测浓度,并且可以用于细胞内的研究。
Description
技术领域
本发明属于蛋白质化学修饰技术领域,具体涉及到利用砜基含氟化合物特异性地与蛋白质中的巯基反应,利用核磁共振进行多肽或蛋白质结构、动态及相互作用的研究。
背景技术
生物体内几乎不含游离的氟元素,因此氟标记的蛋白质(或多肽)能够在没有背景干扰的情况下进行检测。目前,氟代氨基酸(前体)的生物合成仍然是获取氟标蛋白质的有效方法。但是多氟标记可能影响蛋白质的折叠过程、表达效率或稳定性等。位点特异性化学标记可以作为生物标记的有利补充,能够为难以重组表达、分子量超大或复杂系统的蛋白质提供有力标记工具。
但是目前用于19F化学标记的标签仍然存在一些问题,一方面这些化合物难以修饰,基本上属于脂溶性,需要大大过量或加入有机溶剂促溶才能实现高效连接;另一方面,蛋白质与标签形成的化学键在细胞环境下不稳定或形成异构体,影响信号归属。针对上述问题,本发明利用砜基与巯基的特异性反应,设计了含氟标签,既能够与蛋白质在温和的条件下实现高效率的连接,又可以通过离去基团的改造,构建水溶性的标签。结果显示,标记的蛋白质有效地降低了蛋白质的核磁共振检测浓度,并且可以用于细胞内的研究。
发明内容
针对现有技术的不足,本发明提供了一类用于蛋白质半胱氨酸残基修饰的含氟标签及应用,利用砜基化合物与巯基的特异性反应构建了水溶性19F标签,该标签能够在温和条件下实现半胱氨酸残基的修饰,形成稳定的碳硫键,标记的蛋白质有效地降低了蛋白质的核磁共振检测浓度,并且可以用于细胞内的研究。
为了达到上述目的,本发明采取以下技术措施:
含氟标签,具有如下结构:
所述标签的具体结构如下:
上述含氟标签在多肽或蛋白质标记中的应用:所述多肽或蛋白质含有半胱氨酸,含氟标签与半胱氨酸残基反应形成稳定的碳硫键,标记后的多肽或蛋白质能够用于氟-19核磁共振(19F NMR)研究。在本发明的具体实施例中,将含氟标签(标签1-4)对GB1蛋白质(链球菌的免疫G蛋白B1结构域)进行标记,通过质谱Q-TOF发现4个标签与GB1蛋白质的连接效率接近100%,尤其是标签1含有六个等价氟原子,比其它标签的信号增强能力更大,并验证了标签1在其它蛋白质标记中的普适性(钙调蛋白,CaM;泛素蛋白,UBQ;麦芽糖结合蛋白,MBP),还可用于细胞内蛋白质的检测。
上述含氟标签在含巯基的小分子标记中的应用:含氟标签可与巯基发生反应,氟的化学位移发生变化。在本发明的具体实施例中,含氟标签(标签1-4)与谷胱甘肽反应,通过核磁氟谱可用于含巯基的小分子的检测。
与现有技术相比,本发明具有以下优点:
本发明可以实现含氟标签水溶性的改造,避免标记过程中有机试剂或大量标记试剂对蛋白质结构造成影响;能够在温和条件下实现半胱氨酸残基的修饰,形成稳定的碳硫键;能够实现哺乳动物细胞内蛋白质的观测,将其检测浓度降低至微摩尔及以下,接近生理浓度。
附图说明
图1为标签1-4与谷胱甘肽(GSH)的反应速度比较。
图2为标签1-4与GSH反应之后的19F NMR谱。
图3为标签1-4与GB1蛋白质反应之后的质谱图。
图4为同时经3-氟酪氨酸生物标记和标签1-4化学标记的GB1蛋白质在缓冲溶液中19F NMR谱。
图5为经标签1标记的GB1、CaM、UBQ和MBP在缓冲溶液中的19F NMR谱。
图6为经标签1标记的GB1、CaM、UBQ和MBP在HeLa细胞中的19F NMR谱。
具体实施方式
为了更好地理解本发明的内容,下面结合水溶性含氟标签的合成、验证及应用对本发明的内容作进一步说明,但本发明的保护内容不局限于以下实施例。
本发明实施例中所用的原料可以由市场购得,或可用本领域已知的方法合成得到。
实施例1:水溶性含氟标签构建
标签结构如下
标签1的合成
步骤一:在氮气保护下,将4-甲苯亚磺酸钠(TolSO2Na,227mg,1.27mmol),化合物4-溴-2,6-双(三氟甲基)吡啶(A1,250mg,0.85mmol)和四丁基溴化铵(Bu4NBr,82mg,0.26mmol)溶于4mL N,N-二甲基乙酰胺(DMAc),并在100℃的条件下搅拌(600转/分钟)20小时。反应液冷却至室温后缓慢加入去离子水30mL,抽滤,并用水洗涤3次得到产品。产品进一步用硅胶色谱柱(洗脱剂:二氯甲烷)分离纯化,真空干燥,得到中间体B1(300mg,产率:95.6%)。中间体B1的表征数据:1H NMR(CDCl3,600MHz)δ(ppm):8.29(s,2H),7.90(d,2H,J=8.4Hz),7.43(d,2H,J=8.4Hz),2.47(s,3H);13C NMR(CDCl3,150MHz)δ(ppm):154.73,150.50(q,JCF=37.1Hz),146.86,134.99,130.88,128.60,120.09(q,JCF=273.9Hz),120.64,21.79;19F NMR(CDCl3,564MHz)δ(ppm):-67.91(s,6F)。
步骤二:在氮气保护下,将化合物B1(280mg,0.76mmol),N-溴代丁二酰亚胺(NBS,148mg,0.83mmol)和过氧化二苯甲酰(BPO,9mg,0.04mmol)溶解在5mL四氯化碳中,并搅拌(600转/分钟)回流过夜。反应结束后,向反应液中加入饱和食盐水,用二氯甲烷萃取,收集有机相并用无水硫酸钠干燥,旋蒸溶剂得到粗产品。粗产品快速柱层析(洗脱剂:二氯甲烷/石油醚=2:1),得到含原料及目标产物C1的混合物,未进行纯化,直接用于下一步反应。
步骤三:在氮气保护下,将上述混合物和无水吡啶(120mg,1.52mmol)溶解在5mL乙腈中,并搅拌(600转/分钟)回流过夜。反应结束后,冷却到室温,旋蒸溶剂得到粗产品。将粗产品溶于尽可能少的甲醇中,并加入大量乙醚使产品析出,抽滤,并用乙醚洗涤数次,得到淡黄色标签1(210mg,步骤二、三的两步产率:52.4%)。标签1的表征数据:1H NMR(MeOD-d4,600MHz)δ(ppm):9.10(s,br,2H),8.67(t,1H,J=7.8Hz),8.59(s,2H),8.25(d,2H,J=8.4Hz),8.16(s,br,2H),7.76(s,br,2H),6.01(s,2H);13C NMR(MeOD-d4,150MHz)δ(ppm):155.55,151.39(q,JCF=37.1Hz),147.80,146.48,141.93,141.14(s,br),131.56(s,br),131.03,129.97,122.82,120.17(q,JCF=272.9Hz),64.49;19F NMR(MeOD-d4,564MHz)δ(ppm):-71.02(s,6F)。
标签2的合成
步骤一:在氮气保护下,将4-甲苯亚磺酸钠(345mg,1.94mmol),化合物2-氯-6-三氟甲基烟腈(A2,200mg,0.97mmol)和四丁基溴化铵(94mg,0.29mmol)溶于3mL N,N-二甲基乙酰胺,并在100℃的条件下搅拌(600转/分钟)20小时。反应液冷却至室温后缓慢加入去离子水30mL,抽滤,并用水洗涤3次得到产品。产品进一步用硅胶色谱柱(洗脱剂:二氯甲烷)分离纯化,真空干燥,得到中间体B2(137mg,产率:43.4%)。中间体B2的表征数据:1H NMR(CDCl3,600MHz)δ(ppm):8.40(d,1H,J=7.8Hz),8.05(d,2H,J=8.4Hz),7.94(d,1H,J=8.4Hz),7.41(d,2H,J=8.4Hz),2.46(s,3H);13C NMR(CDCl3,150MHz)δ(ppm):160.98,150.32(q,JCF=37.4Hz),146.77,145.76,133.71,130.31,130.03,123.07,119.92(q,JCF=274.2Hz),113.08,110.96,21.97;19F NMR(CDCl3,564MHz)δ(ppm):-68.32(s,3F)。
步骤二:在氮气保护下,将化合物B2(130mg,0.40mmol),N-溴代丁二酰亚胺(78mg,0.44mmol)和过氧化二苯甲酰(5mg,0.02mmol)溶解在5mL四氯化碳中,并搅拌(600转/分钟)回流过夜。反应结束后,向反应液中加入饱和食盐水,用二氯甲烷萃取,收集有机相并用无水硫酸钠干燥,旋蒸溶剂得到粗产品。粗产品快速柱层析(洗脱剂:二氯甲烷/石油醚=2:1),得到含原料及目标产物C2的混合物,未进行纯化,直接用于下一步反应。
步骤三:在氮气保护下,将上述混合物和无水吡啶(63mg,0.8mmol)溶解在4mL乙腈中,并搅拌(600转/分钟)回流过夜。反应结束后,冷却到室温,旋蒸溶剂得到粗产品。将粗产品溶于尽可能少的甲醇中,并加入大量乙醚使产品析出,抽滤,并用乙醚洗涤数次,得到淡黄色标签2(85mg,步骤二、三的两步产率:43.9%)。标签2的表征数据:1H NMR(MeOD-d4,500MHz)δ(ppm):9.21(d,2H,J=5.8Hz),8.79(d,1H,J=8.1Hz),8.70(t,1H,J=7.8Hz),8.26(d,1H,J=8.1Hz),8.21(m,2H),8.14(d,2H,J=8.1Hz),7.86(d,2H,J=8.1Hz),6.13(s,2H);13C NMR(MeOD-d4,126MHz)δ(ppm):160.40,150.49(q,J=37.0Hz),148.81,147.80,146.44,142.03,139.14,131.73,131.11,130.01,125.58,121.36(q,J=274.6Hz),114.18,112.00,64.49;19F NMR(MeOD-d4,471MHz)δ(ppm):-69.73(s,3F)。
标签3的合成
步骤一:在氮气保护下,将4-甲苯亚磺酸钠(296mg,1.66mmol),化合物2-三氟甲基-4-溴吡啶(A3,250mg,1.11mmol)和四丁基溴化铵(107mg,0.33mmol)溶于3mL N,N-二甲基乙酰胺,并在100℃的条件下搅拌(600转/分钟)20小时。反应液冷却至室温后缓慢加入去离子水30mL,抽滤,并用水洗涤3次得到产品。产品进一步用硅胶色谱柱(洗脱剂:二氯甲烷)分离纯化,真空干燥,得到中间体B3(330mg,产率:98.7%)。中间体B3的表征数据:1H NMR(CDCl3,500MHz)δ(ppm):8.92(d,1H,J=4.8Hz),8.11(s,1H),7.96(d,1H,J=4.6Hz),7.87(d,2H,J=8.1Hz),7.39(d,2H,J=8.0Hz),2.45(s,3H);13C NMR(CDCl3,126MHz)δ(ppm):152.53,151.85,150.18(q,J=36.0Hz),146.42,136.11,130.86,128.68,123.76,121.02(q,J=274.8Hz),117.99(q,J=2.8Hz),22.01;19F NMR(CDCl3,471MHz)δ(ppm):-69.99(s,3F)。
步骤二:在氮气保护下,将化合物B3(250mg,0.83mmol),N-溴代丁二酰亚胺(162mg,0.91mmol)和过氧化二苯甲酰(10mg,0.04mmol)溶解在5mL四氯化碳中,并搅拌(600转/分钟)回流过夜。反应结束后,向反应液中加入饱和食盐水,用二氯甲烷萃取,收集有机相并用无水硫酸钠干燥,旋蒸溶剂得到粗产品。粗产品快速柱层析(洗脱剂:二氯甲烷/石油醚=2:1),得到含原料及目标产物C3的混合物,未进行纯化,直接用于下一步反应。
步骤三:在氮气保护下,将上述混合物和无水吡啶(131mg,1.66mmol)溶解在3mL乙腈中,并搅拌(600转/分钟)回流过夜。反应结束后,冷却到室温,旋蒸溶剂得到粗产品。将粗产品溶于尽可能少的甲醇中,并加入大量乙醚使产品析出,抽滤,并用乙醚洗涤数次,得到淡黄色标签3(169mg,步骤二、三的两步产率:44.4%)。标签3的表征数据:1H NMR(MeOD-d4,600MHz)δ(ppm):9.10(d,2H,J=5.9Hz),8.99(d,1H,J=5.0Hz),8.65(t,1H,J=7.8Hz),8.26(s,1H),8.17(m,5H),7.76(d,J=8.2Hz,2H),6.01(s,2H);13C NMR(MeOD-d4,150MHz)δ(ppm):153.50,152.95,150.72(q,JCF=36.2Hz),147.78,146.47,141.76,141.55,131.46,130.68,129.97,125.72,122.26(q,JCF=273.7Hz),118.92,64.50;19F NMR(MeOD-d4,564MHz)δ(ppm):-69.54(s,3F)。
标签4的合成
步骤一:在氮气保护下,将4-甲苯亚磺酸钠(388mg,2.18mmol),4-溴-2,8-二(三氟甲基)喹啉(A4,500mg,1.45mmol)和四丁基溴化铵(140mg,0.44mmol)溶于5mL N,N-二甲基乙酰胺,并在100℃的条件下搅拌(600转/分钟)20小时。反应液冷却至室温后缓慢加入去离子水30mL,抽滤,并用水洗涤3次得到产品。产品进一步用硅胶色谱柱(洗脱剂:二氯甲烷)分离纯化,真空干燥,得到中间体B4(500mg,产率:82.2%)。中间体B4的表征数据:1H NMR(CDCl3,600MHz)δ(ppm):8.99(d,1H,J=8.7Hz),8.54(s,1H),8.23(d,1H,J=7.2Hz),7.90(d,2H,J=8.2Hz),7.85(t,1H,J=8.0Hz),7.37(d,2H,J=8.1Hz),2.42(s,3H);13C NMR(CDCl3,150MHz)δ(ppm):148.58,148.41(q,JCF=37.2Hz),146.26,145.00,136.25,130.63,130.09(q,JCF=5.3Hz),129.97(q,JCF=30.6Hz),129.62,128.66,128.37,123.73,123.17(q,JCF=274.3Hz),120.68(q,JCF=274.4Hz),118.05,21.82;19F NMR(CDCl3,564MHz)δ(ppm):-60.29(s,3F),-67.79(s,3F)。
步骤二:在氮气保护下,将化合物B4(300mg,0.72mmol),N-溴代丁二酰亚胺(140mg,0.79mmol)和过氧化二苯甲酰(9mg,0.04mmol)溶解在5mL四氯化碳中,并搅拌(600转/分钟)回流过夜。反应结束后,向反应液中加入饱和食盐水,用二氯甲烷萃取,收集有机相并用无水硫酸钠干燥,旋蒸溶剂得到粗产品。粗产品快速柱层析(洗脱剂:二氯甲烷/石油醚=2:1),得到含原料及目标产物C4的混合物,未进行纯化,直接用于下一步反应。
步骤三:在氮气保护下,将上述混合物和无水吡啶(114mg,1.44mmol)溶解在5mL乙腈中,并搅拌(600转/分钟)回流过夜。反应结束后,冷却到室温,旋蒸溶剂得到粗产品。将粗产品溶于尽可能少的甲醇中,并加入大量乙醚使产品析出,抽滤,并用乙醚洗涤数次,得到棕色固体标签4(88mg,步骤二、三的两步产率:21.2%)。标签4的表征数据:1H NMR(MeOD-d4,600MHz)δ(ppm):9.11(d,2H,J=5.1Hz,),8.99(d,1H,J=8.7Hz),8.68(s,1H),8.63(t,1H,J=7.8Hz),8.34(d,1H,J=7.2Hz),8.21(d,2H,J=8.3Hz),8.14(m,2H),8.00(t,1H,J=8.0Hz),7.76(d,2H,J=7.9Hz,),6.02(s,2H);13C NMR(MeOD-d4,150MHz)δ(ppm):149.21(q,JCF=36.4Hz),148.99,1 47.72,146.44,145.89,141.73,141.61,131.70(q,JCF=5.3Hz),131.59,131.44,130.49,130.36(q,JCF=31.6Hz),129.93,129.74,124.73,124.55(q,JCF=271.6.4Hz),122.00(q,JCF=273.5Hz),119.64,64.30;19F NMR(MeOD-d4,564MHz)δ(ppm):-61.50(s,3F),-69.28(s,3F)。
实施例2:含氟标签与硫醇的反应
实验以谷胱甘肽为例,验证了其反应活性。室温下,将谷胱甘肽(GSH)分别与标签1-4快速混合于磷酸缓冲溶液(pH=7.4,含10%重水),谷胱甘肽与标签的浓度分别为10.0mM和1.0mM,将反应液立即放入核磁共振波谱仪,采集核磁氟谱,并记录时间。根据标签积分强度的变化,比较标签的反应活性。结果如图1所示,说明这些标签可以与巯基发生反应,但是其活性各不相同。在此条件下的反应速率为:标签2≈标签4>标签1>标签3。标签在反应前后,氟的化学位移发生变化,说明标签1-4可以用于多肽或小分子硫醇检测,结果如图2所示(混合后180分钟的谱图)。
实施例3含氟标签标记GB1蛋白质
实验以模型蛋白质GB1(T11C)为例。室温下,将经过3-氟酪氨酸生物标记的蛋白质分别与标签1-4混合于Tris缓冲溶液中(pH=7.4),蛋白质与标签的浓度分别为0.1mM和0.3mM,反应过夜。混合液经过5次超滤离心,除去标签及其它小分子。通过质谱Q-TOF可以看出,几乎无法观察到未反应GB1的分子离子峰,说明所有标签的连接效率接近100%,结果如图3所示(蛋白质带多个电荷,计算结果及预测值已标识)。将经标记的GB1采集氟谱,结果如图4所示,说明这些标签可以与蛋白质反应,并且与3-氟酪氨酸生物标记相比,信号强度明显增强。
实施例4含氟标签1标记GB1、CaM、UBQ和MBP
从蛋白质信号增强的角度看,标签1含有六个等价氟原子,比其它标签的信号增强能力更大,因此以标签1作为示例。室温下将含有突变半胱氨酸的蛋白质(链球菌的免疫G蛋白B1结构域GB1、钙调蛋白CaM,泛素蛋白UBQ,麦芽糖结合蛋白MBP)分别与标签1混合于Tris缓冲溶液中(pH=7.4),蛋白质与标签的浓度分别为0.1mM和0.3mM,反应过夜。混合液经过多次超滤离心,除去标签及其它小分子,采集氟谱,结果如图5所示,说明标签1可以适用于不同分子量的蛋白质标记。
实施例5标签1可用于细胞内蛋白质的检测
实施例4中的蛋白质经过标签1标记后,通过电穿孔介导蛋白质进入细胞的方法,导入到HeLa细胞中。具体方法如下:将HeLa细胞用0.25%的胰蛋白酶消化洗脱,室温下200×g离心5分钟收集,并用PBS缓冲溶液洗涤1次。将目标蛋白质溶解在用于电穿孔的缓冲溶液EPB(100mM Na3PO4,5mM KCl,15mM MgCl2,15mM HEPES,5mM ATP,5mM GSH,pH 7.0)中,最终浓度在0.3-0.6mM。将约4×107细胞浓悬浮在100μL上述含目标蛋白质的EPB缓冲溶液中,并转移至100μL的电穿孔池(型号为NucleocuvetteTM Vessel)中,采用电穿孔仪器(型号为Amaxa 4D-Nucleofector)的CN114程序进行蛋白质转移,一般需要3-4次电击。其后将细胞转移至含2mL细胞培养基的培养皿中,恢复培养5小时左右。再次将已贴壁的细胞用PBS洗涤3次,用0.125%的胰蛋白酶消化洗脱,室温下200×g离心5分钟,收集细胞,并用PBS缓冲溶液洗涤1次。将细胞再次悬浮在用于核磁信号采集的培养基(5mM HEPES,pH 7.2,90mM D-葡萄糖,10%D2O)300μL中。采集其19F NMR谱,结果如图6所示,说明标签1与蛋白质的连接方式稳定,可以用于细胞内蛋白质的检测。通过加入含氟内标(3-氟酪氨酸),对比积分强度确认蛋白质在细胞内的浓度在0.5-3μM之间,与其生理浓度相当。
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