CN114395024A - 一种用于制备onecut3抗体的多肽及其兔多克隆抗体、应用 - Google Patents
一种用于制备onecut3抗体的多肽及其兔多克隆抗体、应用 Download PDFInfo
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Abstract
一种用于制备ONECUT3抗体的多肽及其兔多克隆抗体、应用,属于生物技术领域。本发明一方面提供了一种制备ONECUT3抗体的多肽,另一方面提供了抗ONECUT3抗原多肽的兔多克隆纯化抗体及其应用。利用本发明所得的抗ONECUT3抗原多肽的兔多克隆纯化抗体,具有对ONECUT3的特异性识别功能,几乎无杂带,且可靠反映细胞水平和组织水平ONECUT3蛋白的表达水平,同时具备检测内源性和外源性表达OUTCUT3蛋白的能力,检测能力优于在售的商品化抗体所得效果。
Description
技术领域
本发明属于生物技术领域,具体涉及一种用于制备ONECUT3抗体的多肽及其兔多克隆抗体、应用。
背景技术
ONECUT3及ONECUT1(HNF6)、ONECUT2属于原始的同源盒(homeobox)转录因子超家族中的ONECUT家族。它们共同的结构含有N端CUT结构域和C端的Homeobox结构域。这3种转录因子在胚胎发育、组织形成和分化等生理过程中起重要作用。ONECUT1在胚胎发育中通过TGF-beta信号通路动态调控与细胞黏附和迁移有关的基因表达,其异常表达在一些恶性肿瘤的进展和转移中起重要作用,如在肝癌和胰腺癌细胞中,ONECUT1可结合AFP、CyclinD1、Cdc25A、Cdk2和E2F1等基因启动子区参与细胞增殖和细胞周期的调控,诱导S期细胞增多,激活TGF-beta信号通路。异常高表达ONECUT1还可促进大肠癌细胞的增殖和转移。在转移性去势抵抗性前列腺癌(mCRPC)中,ONECUT2通过雄激素依赖途径促进肿瘤细胞的增殖及存活。以上研究表明,ONECUT家族中的ONECUT1和ONECUT2异常表达参与了肿瘤的发病机制。ONECUT3是否参与了血液肿瘤的发生发展机制目前尚无报道。
目前在售ONECUT3存在效价比低、特异性差的问题,难以满足于细胞水平和组织水平ONECUT3蛋白检测的科研需求。如在实际应用中,如Novus(NBP1-91528)的抗体仅对外源过表达ONECUT3有检出能力,而无法检测出细胞内源性表达的ONECUT3蛋白;abcam(ab181450)抗体由于诱导ONECUT3蛋白多克隆抗体的抗原多肽序列设计原因,特异性不佳,检测时存在多杂带的问题。
发明内容
针对现有技术存在的问题,本发明的目的在于设计提供一种用于制备ONECUT3抗体的多肽及其兔多克隆抗体、应用的技术方案。
本发明具体通过以下技术方案实现:
所述的一种用于制备ONECUT3抗体的多肽,该多肽的核苷酸序列为CMNRWAEEPSTAPG,如SEQ ID NO.1所示。
所述的多肽在制备抗ONECUT3抗原蛋白的兔多克隆抗体中的应用。
利用所述的多肽制备抗ONECUT3抗原蛋白的兔多克隆抗体的方法,包括以下步骤:
1)将ONECUT3的抗原多肽分别与载体蛋白KLH、BSA偶联,纯化后得到偶联产物;
2)取偶联产物免疫兔子,取多次免疫后的兔血清,用ELISA法对效价进行检测,效价达理想值后加强免疫一次,收集免疫兔血清;
3)利用抗原亲和纯化以得到多克隆抗体。
上述制备得到的抗ONECUT3抗原蛋白的兔多克隆抗体在检测内源性和外源性ONECUT3中的应用。
利用本发明所得的抗ONECUT3抗原多肽的兔多克隆纯化抗体,具有对ONECUT3的特异性识别功能,几乎无杂带,且可靠反映细胞水平和组织水平ONECUT3蛋白的表达水平,同时具备检测内源性和外源性表达OUTCUT3蛋白的能力,检测能力优于在售的商品化抗体所得效果。
附图说明
图1为Human ONECUT3的氨基酸序列;
图2为ONECUT蛋白结构分析图;
图3为实施例2中的抗体肽段封闭实验(Western-Blot图);
图4为实施例3中的敲减验证抗体特异性实验(Western-Blot图);
图5为实施例4中的骨髓增生异常综合征病人的骨髓原代样本内源性ONECUT3表达检测(Western-Blot图);
图6为实施例5中的骨髓组织ONECUT3表达的免疫组化检测结果图。
具体实施方式
以下结合实施例来进一步说明本发明。
实施例1:ONECUT3多肽的设计及合成
1.ONECUT3抗体的抗原蛋白序列的设计
Human ONECUT3的氨基酸序列(UniProtKB-O60422)如图1所示。
ONECUT3蛋白结构分析如图2所示。
根据以上对ONECUT3蛋白中每个氨基酸的表面可接触性、亲水性和弹性等可以推算出ONECUT3蛋白抗原决定簇区域,故设计的肽段序列为CMNRWAEEPSTAPG(human ONECUT3469-482aa)。
2.人工合成多肽
人工合成多肽采用多肽固相合成法,具体步骤如下:
(1)树脂的称取:选取Wang树脂,如:要做0.2mmol选用树脂魏0.5mmol/g,即称取树脂的量为0.2mmol除以0.5mmol/g=0.4g溶胀。把称取好的树脂放入反应柱里面,然后用DCM溶胀半个小时。DCM加的量为树脂高度的2~3倍,也就是把树脂充分溶胀完全。可以微量鼓气。
(2)去保护。(Cl-树脂第一步不要去保护,不过以后偶联上氨基酸后就要去保护)其余两种树脂都要去保护(Fmoc),先把DCM抽干,然后用DMF洗涤3遍,去除DCM,然后用20%六氢吡啶去保护,5+10即共两遍,第一遍5分钟,第二遍10分钟,中间用DMF洗涤一遍。
(3)去保护后洗涤。用DMF洗涤6遍。
(4)偶联。我们现在按照3倍量投氨基酸,即0,2mmol的树脂,我们投氨基酸的量为0.2mmol*3=0.6mmol乘以其分子量就是要称取的质量。此外加入称取激活剂DIC和DIEA等。
(5)偶联时检测。用滴管取树脂(少许,约15粒左右,只要检测可以辨认即可)与小试管中,分别滴加2滴A液(5g茚三酮溶解至100ml乙醇中)、2滴B液(80g苯酚溶解至20ml乙醇中)、2滴C液(2ml 0.001M KCN加入至98ml重蒸吡啶中),放到加热3分钟。然后取出来看树脂是否透明,如溶液颜色深影响观察,可以倒掉溶液,加少许DMF洗净,再观察。若树脂检测透明,即可以偶联下一个氨基酸。若树脂不透明,延长反应时间,若还不透明,可以进行复投。一定要保证每一步都反应完全再偶联下一个氨基酸。
(6)偶联后洗涤。偶联完毕后,DMF洗涤3遍。
(7)以上是偶联一个氨基酸的步骤,重复第3-6步,直到最后一个氨基酸偶联完毕。
(8)最后一个氨基酸偶联好后,再去保护,去保护完后收缩,DMF洗涤3遍,DCM3遍,甲醇3遍,抽干肽树脂。
(9)称取完成的干肽树脂,装入50ml的离心管中,加入裂解液(每克10倍ml)如:1g肽树脂加10ml的裂解液。加入裂解液D液(TFA:TIS:Water=95:2.5:2.5),反应2个小时,每10-15分钟摇荡一下,让其充分反应,可放入摇床中(25℃)。反应好后,抽滤,溶液倒入冰乙醚中沉淀,然后离心,离心3-4遍。
(10)把离心好后的肽先放通风橱中吹一会,然后放入真空干燥器中抽干。
(11)取少量到样品管中,填检测单送质检部门打质谱,判断质谱是否正确,若正确,把剩余的肽填单送纯化。
3.多肽偶联
1)将20mg KLH溶于2mL,5mM的EDTA水溶液中。
2)称取8mg Sulfo-SMCC完全溶于50μL DMSO中,之后加入150μL 1×PBS,混合均匀。
3)将Sulfo-SMCC溶液逐滴加入到KLH中,边加边轻轻摇晃(剧烈摇晃会产生沉淀),室温放置1h。
4)将上述活化好的KLH溶液放入透析袋中,透析夹夹好,于2L的1×PBS中,4℃冰箱磁力搅拌下透析1h。
5)更换新的1×PBS透析2h,重复一次。将活化透析好的KLH置于15mL进口离心管中,并在管上标记上试剂名称、时间和浓度,4℃冰箱保存。
6)称取4mg多肽(肽段序列为CMNRWAEEPSTAPG),溶于50μL的DMSO中,再加入200μL的1×PBS,快速混匀,随后按照多肽:KLH=1mg:680μg的比例立即加入KLH,4℃冰箱过夜或者室温下反应2h。
7)将上述交联好的KLH-peptide交联复合物放入透析袋中,透析夹夹好,于4L的1×PBS中,4℃冰箱磁力搅拌下透析过夜。
8)将透析好的KLH-peptide取出到干净的1.5mL离心管中,按照免疫剂量进行分装,-20℃冰箱保存。
4.免疫兔,获得抗血清
1)动物选择:兔子采用新西兰白兔,体重2.5Kg左右青壮年。动物选择毛色要光泽,活动自如的健康动物。挑选好动物,先预养2周左右。目的是淘汰有些不合格的动物,使后期的实验能顺利进行。
2)实验前准备:兔子做好标记。
3)抗原准备:
3.1)将抗原(3中的偶联产物)从-20℃冰箱中拿出,常温溶解,避免反复冻融。
3.2)抽取抗原(抗原完全混匀),首免抗原浓度为1mg/ml,兔子为0.5ml/只,二免-四免抗原浓度减半,剂量不变。
3.3)抽取佐剂,佐剂和抗原为1:1体积比抽取。首免采用完全佐剂,二-四免采用不完全佐剂。抽取时,佐剂要充分混合均匀后再抽入注射器。
3.4)二个注射器用针筒连接管对接后进行完全乳化,乳化标准为:乳化好的免疫原滴入37度水中不分散为合格。
4)免疫:兔子采用多点皮下注射,每点为0.2ml。
免疫时间:首免后第14天进行二免,二免到三免间隔时间为7天。兔子三免后第7天耳中动脉采小样血清检测,检测合格,7天后加免,加免完7天后可采集全血。
5.ELISA检测(间接法)
1)包板:用包被缓冲液(coating buffer:Na2CO3和NaHCO3缓冲液)将已知抗原稀释至1μg/ml,在每个聚苯乙烯板的反应孔中加50μl,4℃过夜,次日,弃去孔内溶液,用1xTBST洗涤缓冲液以每孔180μl洗1次。
2)封闭:每孔加60μl的1%BSA(TBST配制)进行封闭,置37℃孵育1小时。之后弃封闭液。
3)加样:加一定稀释的待检样品(把待检样品按照一定的比例进行稀释),50μl于上述已封闭的反应孔。同时设置好阳性对照孔(阳性血清)与阴性对照孔(BSA)。置37℃孵育1小时,之后弃封闭液,用1xTBST洗涤缓冲液以每孔180μl洗2次。
4)加酶标抗体:将新鲜稀释的二抗-HRP(1:5K,用1%BSA进行稀释),以50μl/孔加入酶标板孔中,置37℃孵育45min,之后弃封闭液,用1xTBST洗涤缓冲液以每孔180μl洗3次。
5)加底物液显色:于各反应孔中加入临时配制的TMB底物溶液100μl,置37℃反应5min。
6)终止反应:于各反应孔中加入2M硫酸90μl。
7)读板:将酶标板置于预热过的酶标仪中(450nm)进行读数,保存数据,进行分析。
6.利用抗原多肽纯化抗血清,得到纯化抗体
1)将亲和层析柱依次用20mL纯水和1×PBS(pH7.4),流速70mL/h充分清洗。
2)取待纯化的血清10mL于50mL离心管中,用孔径0.45μm,直径25mm微孔滤膜抽滤。
3)将抽滤过的血清样品以40mL/h流速上样,重复一次。
4)用20mL 1×PBS(pH7.4)以70mL/h的流速清洗柱子,10min后连接蛋白检测仪,清洗过程中调节仪器透光率(T档)示数为100。
5)调节蛋白检测仪吸光率(1A档)示数为0,此时打开电脑桌面的HD-A电脑采集器,并将满屏量程调到5,用甘氨酸溶液(pH 2.7,0.2M)以40mL/h的速度洗脱抗体,此时按下绿色的洗脱记录按钮开始洗脱,当仪器的示数开始升高时开始收集抗体。
6)在抗体收集过程中以1M的碳酸氢钠及时调节抗体的pH值至7左右,并记录洗脱峰的最高峰值。
7)抗体收集完后,调节pH值至7左右,并记录洗脱的抗体体积,之后用纯净水冲洗连接收集器的橡胶管。
8)依次用20mL 1×PBS和纯水以70mL/h的速度清洗亲和层析柱,之后加入20%乙醇,封口,4℃冰箱保存。
9)纯化后的抗体根据不同要求送检:ELISA,WB,ICC等。
结果
1.多肽信息
多肽编号 | 序列信息 |
HAPM1067-1 | 469-482a.a.CMNRWAEEPSTAPG |
2.免疫周期表
3.血清ELISA的检测结果
结论:5206免疫血清合格(基于ELISA判断)。
定义:1:256000的OD450值为P值(阳性值),BSA孔的OD450值为N值(阴性值);
5206P/N=(0.494+0.367)/2÷(0.167+0.098)/2=3.2>2.1达到阳性合格标准。
基础ELISA合格。
5207P/N=(0.420+0.428)/2÷(0.107+0.098)/2=4.1>2.1达到阳性合格标准。
基础ELISA合格。
实施例2:抗体肽段封闭实验
(1)取1mg肽段(HAPM1067-1)溶于无酶灭菌水,终浓度为1mg/ml;
(2)取2管15ml离心管,其中一管配置抗体和肽段预混液,Rabbit Anti-ONECUT3抗体(#5206,Conc.0.5mg/ml)与肽段加入于5%脱脂牛奶中,抗体与肽段摩尔比为1:2,为封闭的抗体;另一管仅加入Rabbit Anti-ONECUT3抗体(#5206,Conc.0.5mg/ml)于5%脱脂牛奶中,即抗体与肽段摩尔比为1:0,为抗体对照;4℃预混过夜;
(3)收集病人骨髓单个核细胞,按照1x 10E6细胞加50μL SDS蛋白变性裂解液,吹打混匀,置于冰上裂解10min,Bioruptor超声(功率High,超声10s停10s,4-6个循环);
(4)等量样品于10%SDS-PAGE凝胶电泳;
(5)待溴酚蓝电泳至底部时停止并进行PDVF膜转膜;
(6)5%脱脂牛奶室温封闭1h;
(7)剪膜后分别置于对照抗体和封闭的抗体,4℃冰箱孵育过夜,1×TBST洗膜3次(每次10min);
(8)Goat Anti-rabbit二抗室温孵育1h,1×TBST洗膜3次(每次10min);
(9)洗膜后加入化学显影液(PierceTMSuperSignalTMWest Pico PLUSChemiluminescent,Thermo),置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
(10)用洗脱液(Restore PLUS Western Blot Stripping Buffer,Thermo)洗脱15min以后,5%牛奶室温封闭1h;
(11)孵育Anti-Actin HRP(Huabio,ET1702-67)室温1h,1×TBST洗膜3次(每次10min);再次加入化学显影液(PierceTMSuperSignalTMWest Pico PLUSChemiluminescent,Thermo),置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
结果:抗体对照组(即抗体比肽段=1:0)可见ONECUT3内源性条带(约54kDa);抗体封闭组(即抗体比肽段=1:2),泳道无信号,提示该ONECUT3抗体可被该肽段封闭(见图3)。
实施例3:敲减验证抗体特异性实验
(1)构建Tet-pLKO-hOC3质粒:Tet-pLKO-puro载体(从美国Addgene公司购入)经Ecor I和Age I双酶切;合成以下碱基序列并插入双酶切空载:
ShOC3 Forward:CCGGcagcatcccgcaggcaatcCTCGAGgattgcctgcgggatgctgTTTT(如SEQ ID NO.2所示);
ShOC3 Reverse:AATTAAAAcagcatcccgcaggcaatcCTCGAGgattgcctgcgggatgctg(如SEQ ID NO.3所示);转化后挑取单克隆测序;提取测序正确的质粒;
(2)以10cm培养皿为例,当Hela细胞长至70%密度时进行转染,取500μl无血清Opti-MEM培养基两支,分别加入脂质体转染试剂PolyJet(Signagen)40μl和质粒9μg,将质粒加入转染试剂中充分混匀,室温静置10-15min后滴入细胞培养皿中,对照组不加doxycycline,敲降组加入1μg/mldoxycycline;
(3)72h后收集对照和敲降细胞,按照1x 10E6细胞加50μL SDS蛋白变性裂解液,吹打混匀,置于冰上裂解10min,Bioruptor超声(功率High,超声10s停10s,4-6个循环);
(4)等量样品于10%SDS-PAGE凝胶电泳;
(5)待溴酚蓝电泳至底部时停止并进行PDVF膜转膜;
(6)5%脱脂牛奶室温封闭1h;
(7)Rabbit Anti-ONECUT3抗体(#5206,Conc.1mg/ml)一抗置于4℃冰箱孵育过夜,1×TBST洗膜3次(每次10min);
(8)Goat Anti-rabbit二抗室温孵育1h,1×TBST洗膜3次(每次10min);
(9)洗膜后加入化学显影液(PierceTMSuperSignalTMWest Pico PLUSChemiluminescent,Thermo),置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
(10)用洗脱液(Restore PLUS Western Blot Stripping Buffer,Thermo)洗脱15min以后,5%牛奶室温封闭1h;
(11)孵育Anti-Actin HRP(Huabio,ET1702-67)室温1h,1×TBST洗膜3次(每次10min),再次加入化学显影液,置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
结果:对照组(即-DOX组)可见ONECUT3内源性条带(约54kDa);敲低组(即+DOX组)泳道无信号,提示该抗体特异性识别人源ONECUT3蛋白(见图4)。实施例4:骨髓增生异常综合征病人的骨髓原代样本内源性ONECUT3表达检测(WB)
(1)构建pcDNA3.1-hOC3质粒:将humanONECUT3 CDS序列合成于pcDNA3.1-空载内(由丰晖生物完成),质粒测序鉴定;
(2)以10cm培养皿为例,当293T细胞长至70%密度时进行转染,取500μl无血清Opti-MEM培养基两支,分别加入脂质体转染试剂PolyJet(Signagen)40μl和质粒9μg,将质粒加入转染试剂中充分混匀,室温静置10-15min后滴入细胞培养皿中;
(3)72h后收集对照和敲降细胞,按照1x 10E6细胞加100μL SDS蛋白变性裂解液,吹打混匀,置于冰上裂解10min,Bioruptor超声(功率High,超声10s停10s,4-6个循环);作为阳性对照;
(4)各取2份伴有复杂核型的骨髓增生异常综合征病人骨髓样本(P1和P2)、正常核型的骨髓增生异常综合征病人骨髓样本(P3和P4),每个骨髓、健康供者骨髓样本(D1和D2),每份骨髓样本取5ml于15ml离心管;
(5)用Ficoll人淋巴细胞分离液进行相对密度梯度离心收集单个核细胞,行细胞计数,按照1x 10E6细胞加50μL SDS蛋白变性裂解液,吹打混匀,置于冰上裂解10min,Bioruptor超声(功率High,超声10s停10s,4-6个循环);作为检测样品;
(6)3μL的阳参样品(1x loading补齐体积)和15μL的待测样品于10%SDS-PAGE凝胶电泳;
(7)待溴酚蓝电泳至底部时停止并进行PDVF膜转膜;
(8)5%脱脂牛奶室温封闭1h;
(9)Rabbit Anti-ONECUT3抗体(#5206,Conc.1mg/ml)一抗置于4℃冰箱孵育过夜,1×TBST洗膜3次(每次10min);
(10)Goat Anti-rabbit二抗室温孵育1h,1×TBST洗膜3次(每次10min);
(11)洗膜后加入化学显影液(PierceTMSuperSignalTMWest Pico PLUSChemiluminescent,Thermo),置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
(12)用洗脱液(Restore PLUS Western Blot Stripping Buffer,Thermo)洗脱15min以后,5%牛奶室温封闭1h;
(13)孵育Anti-Actin HRP(Huabio,ET1702-67)室温1h,1×TBST洗膜3次(每次10min),再次加入化学显影液,置于于化学发光显影仪(ChemiDoc MP成像系统,Bio-Rad)中显影。
结果:使用ONECUT3抗体作为一抗,可检测内源性和外源性的ONECUT3蛋白表达,同时骨髓增生异常综合征患者伴随复杂核型组骨髓细胞ONECUT3表达相对正常核型组升高,健康供者组骨髓细胞ONECUT3表达低(见图5)。
实施例5:骨髓组织ONECUT3表达的免疫组化检测
(1)石蜡切片脱蜡至水:依次将切片放入二甲苯Ⅰ8min-二甲苯Ⅱ8min-二甲苯Ⅲ8min-无水乙醇Ⅰ5min-无水乙醇Ⅱ5min-85%酒精5min-75%酒精5min,自来水洗2min。
(2)抗原修复:组织切片置于盛满柠檬酸抗原修复缓冲液(PH 6.0)的修复盒中于微波炉内进行抗原修复,中火8min至沸腾停火8min再转中低火7min,此过程中应防止缓冲液过度蒸发,切勿干片。自然冷却后将玻片置于PBS(PH7.4)中在脱色摇床上晃动洗涤3次,每次5min。
(3)画圈:用组化专用的组化笔沿着组织外围轮廓画一个与组织间隔3-4毫米的小圈,然后加入足量的PBS保证后续依次加入的封闭血清,一抗,二抗,以及显色剂能完全覆盖组织,而不沿着玻片流走。
(4)阻断内源性过氧化物酶:切片加上试剂盒内的内源性过氧化物酶,每张切片50-100ul室温避光孵育25min,将玻片置PBS(PH7.4)中在脱色摇床上晃动洗涤3次,每次5min。
(5)血清封闭:在组化圈内滴加3%BSA均匀覆盖组织,室温封闭30min。
(6)加一抗:轻轻甩掉封闭液,在切片上滴加PBS按一定比例配好的Rabbit Anti-ONECUT3抗体(1:100),切片平放于湿盒内4°孵育过夜。
(7)加二抗:玻片置于PBS(PH7.4)中在脱色摇床上晃动洗涤3次,每次5min。切片稍甩干后在圈内滴加与超敏兔鼠通用二抗(HRP标记)覆盖组织,室温孵育50min。
(8)复染细胞核:苏木素染色2-3min左右,自来水洗,1%的盐酸酒精分化液分化数秒,自来水冲洗,氨水返蓝液返蓝15-30s,流水冲洗。
(9)脱水封片:将切片依次放入75%酒精5min-85%酒精5min--无水乙醇Ⅰ5min-无水乙醇Ⅱ5min-二甲苯Ⅰ5min中脱水透明,将切片从二甲苯拿出来稍晾干,中性树胶封片。
(10)显微镜镜检,图像采集分析。
结果:使用ONECUT3抗体作为一抗,可检测骨髓组织中内源性ONECUT3蛋白的表达,主要位于核内表达;左侧为10x镜下,右图为40x镜下观察所示。(见图6)。
综上所述,利用本发明所得抗ONECUT3抗原多肽的兔多克隆纯化抗体,具有对ONECUT3的特异性识别功能,几乎无杂带,且可靠反映细胞水平和组织水平ONECUT3蛋白的表达水平,同时具备检测内源性和外源性表达OUTCUT3蛋白的能力。
序列表
<110> 浙江大学医学院附属第一医院
<120> 一种用于制备ONECUT3抗体的多肽及其兔多克隆抗体、应用
<160> 3
<170> SIPOSequenceListing 1.0
<210> 1
<211> 14
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 1
Cys Met Asn Arg Trp Ala Glu Glu Pro Ser Thr Ala Pro Gly
1 5 10
<210> 2
<211> 52
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 2
ccggcagcat cccgcaggca atcctcgagg attgcctgcg ggatgctgtt tt 52
<210> 3
<211> 52
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 3
aattaaaaca gcatcccgca ggcaatcctc gaggattgcc tgcgggatgc tg 52
Claims (4)
1.一种用于制备ONECUT3抗体的多肽,其特征在于该多肽的核苷酸序列为如SEQ IDNO.1所示。
2.如权利要求1所述的多肽在制备抗ONECUT3抗原蛋白的兔多克隆抗体中的应用。
3.利用权利要求1所述的多肽制备抗ONECUT3抗原蛋白的兔多克隆抗体的方法,其特征在于包括以下步骤:
1)将ONECUT3的抗原多肽分别与载体蛋白KLH、BSA偶联,纯化后得到偶联产物;
2)取偶联产物免疫兔子,取多次免疫后的兔血清,用ELISA法对效价进行检测,效价达理想值后加强免疫一次,收集免疫兔血清;
3)利用抗原亲和纯化以得到多克隆抗体。
4.如权利要求3制备得到的抗ONECUT3抗原蛋白的兔多克隆抗体在检测内源性和外源性ONECUT3中的应用。
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