人PrP多克隆抗体的制备及鉴定

制备PrP(prion protein)多克隆抗体,验证原核表达的人PrP的抗原性,为PrP空间构象的转变机制等深层次的研究以及人PrP单克隆抗体的制备提供重要的试验材料.以融合的人成熟PrP蛋白(mature prion protein,mPrP)为抗原,以pET30a(+)空载体的E.coli BL21 (DE3)的菌体蛋白作为对照免疫原,免疫小鼠.ELISA和Western blot分别检测多克隆抗体的效价和特异性.结果5只动物中3只均产生了较高效价的抗血清,确定人 PrP多克隆抗体效价为1∶4 096,能与人mPrP特异性结合.证明获得的人mPrP具有良好的免疫原性.     

鸭MHCⅡβ基因的克隆、表达及多克隆抗体的制备

据NCBI上已发表的序列设计引物,通过RT—PCR从北京鸭脾脏的总RNA中扩增得到MHCⅡβ基因,将其克隆至pMD18-T载体上,经酶切分析及测序鉴定后,进一步亚克隆至原核表达载体pGEX-KG中,转化大肠杆菌BL21中诱导表达。蛋白纯化后,免疫昆明小鼠制备多克隆抗体,经1：100倍稀释后用于Westernblot分析。结果表明：克隆得到了鸭MHCⅡβ链基因,大小为798bp,经核苷酸测序与已登录的基因序列同源性为92％;成功构建了原核表达载体,融合蛋白得到了高效表达且纯化后纯度达95％。制备的鼠抗鸭MHCⅡβ多克隆抗体,经酶联免疫吸附实验（ELISA）与免疫印迹法（Westernblot）证实抗体的效价高、特异性强,为深入研究鸭MHCⅡ奠定了基础。     

鸡plgR多克隆抗体的制备及初步鉴定

根据GenBank中鸡pIgR基因序列和蛋白序列,设计引物,利用PCR技术扩增胞外配体结合区片段,构建原核重组表达质粒pET-32a(+)/pIgR,将重组质粒转化到大肠杆菌BL21(DE3),经IPTG的诱导表达融合蛋白,通过镍离子螯合柱纯化后免疫新西兰大白兔,获得兔抗鸡pIgR多克隆抗体,通过酶联免疫吸附试验(ELISA法)和Western Blot法检测抗体的效价和特异性。结果显示,成功制备特异性的鸡pIgR抗体,为研究鸡pIgR的功能提供有力依据。     

鸭补体调节因子H的原核表达及多克隆抗体制备

为制备鸭补体调节因子H(CFH)的多克隆抗体,从健康雏鸭的肝脏组织中提取总RNA及反转录合成cDNA,PCR扩增补体调节因子H基因的2个片段H1和H2,插入到载体pMD19-T,测序正确后,将目的基因分别克隆至原核表达载体pCold-TF,转化至大肠埃希菌BL21(DE3),用IPTG诱导表达蛋白,重组蛋白经SDS-PAGE检测,镍柱亲和层析纯化的重组蛋白免疫新西兰大白兔,制备多克隆抗体。结果表明,成功构建重组表达质粒pCold-TF-H1和pCold-TF-H2,SDS-PAGE检测重组蛋白为可溶性表达,TF-H1和TF-H2多克隆抗体效价均超过1∶10000。所制备的多克隆抗体可以为进一步研究鸭CFH的功能奠定基础。     

雌二醇多克隆抗体的制备与鉴定

制备雌二醇完全抗原,并通过免疫家兔得到多克隆抗体,为下一步制备雌二醇单克隆抗体和雌二醇检测ELISA试剂盒奠定基础。试验以牛血清白蛋白(BSA)、卵清蛋白(OVA)为载体,采用碳化二亚胺法,合成了雌二醇(E2)的2种免疫偶合物:免疫原E2-BSA和包被原E2-OVA;通过紫外光谱定性证明偶合物偶联成功与否,并对偶合物的蛋白含量、结合比进行测定并以免疫原E2-BSA免疫家兔,制备多克隆抗体,用包被原E2-OVA进行ELISA,对多克隆抗体特异性及效价进行检测。结果表明成功合成了雌二醇人工抗原即免疫原E2-BSA和包被原E2-OVA,二者的蛋白浓度分别为5.455和7.533mg/mL,结合比分别为7:1和8:1;制备的多克隆抗体特异性好,血清效价为1:106。     

鸭黄病毒多克隆抗体的制备及鉴定

本试验旨在建立鸭黄病毒多克隆抗体.将鸭黄病毒在鸡胚中增殖,收集尿囊液,检测尿囊液中增殖的鸭黄病毒EID50为1.8×105/mL.制备免疫原.制定免疫程序,用此免疫原免疫家兔.免疫程序实施完毕后,收集兔抗鸭黄病毒血清,用间接ELISA的方法测定兔抗鸭黄病毒多克隆抗体的量显示,多克隆抗体的量随免疫天数的增加而增多.用饱和硫酸铵盐析其中的IgG,检测其含量为20.3mg/mL.该研究为进一步建立鸭黄病毒病的ELISA检测方法奠定了实验基础.     

鸭凝血因子Ⅷ的原核表达及多克隆抗体制备

为制备鸭凝血因子Ⅷ的多克隆抗体,试验根据抗原决定簇预测软件对鸭Ⅷ因子全基因序列进行分析,发现Ⅷ因子主要抗原决定簇位于C端,对鸭ⅧC端(Ⅷ-C)进行密码子优化、原核表达;免疫小鼠制备多抗,并利用ELISA测定效价.结果显示,优化后的Ⅷ-C能在Escherichia coli表达;Ⅷ-C在Escherichia coli ...     

鸭坦布苏病毒Capsid蛋白原核表达及多克隆抗体制备

【目的】本研究选择原核表达系统表达鸭坦布苏病毒(Duck Tembusu virus, DTMUV)核衣壳蛋白(Capsid protein),并制备其多克隆抗体,为DTMUV分子机制研究奠定基础。【方法】根据DTMUV-201909株基因序列,运用一步克隆技术将Capsid基因克隆至表达载体pET-30a(+)中,将重组质粒转化大肠杆菌BL21(DE3)感受态细胞,利用IPTG进行诱导表达,通过SDS-PAGE和Western blotting鉴定重组蛋白;使用ISA206佐剂与纯化后的重组蛋白混合乳化后免疫BALB/c小鼠,以获得多克隆抗体。间接ELISA方法测定获得的多克隆抗体效价,并对多克隆抗体进行Western blotting和间接免疫荧光试验(IFA)验证。【结果】试验成功构建pET-30a-Capsid重组质粒,SDS-PAGE结果显示,表达的重组蛋白大小约为18 ku,主要以包涵体形式存在;Western blotting结果表明,该蛋白能与抗His标签鼠单克隆抗体发生特异性反应,具有良好反应原性。间接ELISA结果显示,制备的鼠抗Capisd蛋白多克隆抗体效价可达1...     

己烯雌酚多克隆抗体的制备和鉴定

用混合酸酐法合成的BSA-DES免疫兔子,制备抗DES的特异性抗体,分别用混合酸酐法和碳二亚胺法合成的OVA-DES作为包被原检测抗体;用混合酸酐法合成的OVA-DES和碳二亚胺法合成的OVA-DES免疫小白鼠,制备抗DES的特异性抗体,分别用混合酸酐法合成的BSA-DES和碳二亚胺法合成的BSA-DES作为包被原检测抗体。检测结果表明:三种免疫原免疫动物,都产生了DES的特异性抗体,并建立了间接阻断ELISA法。这为残留DES酶免疫检测试剂盒的制备奠定了基础。     

鸡源SAMHD1蛋白多克隆抗体的制备与鉴定

为制备鸡源宿主限制因子SAMHD1(chSAMHD1)的多克隆抗体,本试验根据chSAMHD1基因序列设计引物,扩增部分chSAMHD1片段,构建p ET-chSAMHD1原核表达质粒,并将其转化至BL21(DE3)大肠杆菌,经IPTG诱导和镍柱亲和层析纯化获得重组chSAMHD1蛋白。将重组蛋白免疫BALB/c小鼠制备抗chSAMHD1多克隆抗体,通过Westernblot和IFA测定多克隆抗体的反应性。结果显示,chSAMHD1重组蛋白的相对分子质量约为75.0 k Da,与预期大小一致;重组蛋白以包涵体形式表达;所制备的chSAMHD1多克隆抗体效价达到1:512 000;IFA结果证实,本试验所制备多克隆抗体能够特异性识别DF-1细胞中过表达的chSAMHD1蛋白。以上结果表明,该研究成功制备了chSAMHD1蛋白多克隆抗体,从而为鸡源SAMHD1蛋白功能的深入研究奠定了基础。     

Preparation and Identification of Polyclonal Antibodies against Porcine Cyclin Dependent Kinase 2

In order to research the biofunction of porcine cyclin dependent kinase 2 (pCDK2), this study prepared polyclonal antibodies against pCDK2.The recombinant prokaryotic expression plasmid pET28a-pCdk2 was constructed and transformed into BL21 (DE3), IPTG was used to induce the expression of recombinant pCDK2 (rpCDK2) which was then analyzed by SDS-PAGE and Western blotting.The expressed proteins were purified and emulsified with freund's adjuvant, the mixture was used to immunize the rabbits to prepare polyclonal antibodies against pCDK2.The immunocompetence of the antibody was identified by immunoperoxidase monolayer assay (IPMA), and the specificity was confirmed by Western blotting.The results showed that rpCDK2 was successfully expressed by prokaryotic expression system, and the expression products showed two forms:Solubility and inclusion body(IB), the molecular weight of the solute rpCDK2 was about 38 ku, however three different molecular weight forms (from 38 to 43 ku) of IB were observed.IPMA results showed that polyclonal antibodies against pCDK2 protein showed perfect activity which could recognize pCDK2 expressed in PK-15 cells and ST cells specifically.Western blotting analysis showed that four bands with different molecular weight forms (from 34 to 50 ku) were observed when the polyclonal antibodies against pCDK2 protein reacted with the total protein extracted from PK-15 and ST cells.In conclusion, the rpCDK2 protein was successfully expressed by prokaryotic expression system, the prepared rabbit polyclonal antibodies against pCDK2 protein showed wonderful activity and specificity, and the study provided basic material for the research of protein biofunction and related diseases.     

新型鸭呼肠孤病毒σB蛋白的原核表达及其多克隆抗体制备

为制备新型鸭呼肠孤病毒（new-type duck reovirus,NDRV）XX株σB蛋白的多克隆抗体,试验经RT-PCR扩增NDRV XX株σB基因编码序列,构建原核表达质粒pET-32a（+）-σB,将其转化至大肠杆菌BL21（DE3）感受态细胞后,经IPTG诱导获得His-σB重组蛋白。SDS-PAGE显示成功表达出约55 ku的融合蛋白,主要以包涵体形式存在,其表达时的最佳诱导时间、IPTG诱导浓度分别为3 h和0.25 mmol/L。经Ni²⁺柱亲和层析纯化获得可溶性重组蛋白,将蛋白经Western blotting和蛋白质谱鉴定为高纯度的σB重组蛋白,将纯化后σB重组蛋白按合理免疫程序免疫家兔,获得多抗隆抗体经Western blotting分析显示出特异性的反应。本试验结果为NDRV σB蛋白功能的深入研究及基因工程疫苗的研发奠定了基础。     

猪细胞周期蛋白依赖性激酶2多克隆抗体的制备与鉴定

为研究猪细胞周期蛋白依赖性激酶2(pCDK2)的生物学功能,本试验构建重组原核表达载体pET28a-pCdk2,转化大肠杆菌BL21 (DE3)受体菌,用IPTG诱导重组蛋白(rpCDK2)表达并进行SDS-PAGE和Western blotting鉴定,蛋白经纯化及与弗氏佐剂乳化后免疫家兔制备多克隆抗体。分别用Western blotting和免疫过氧化物酶单层细胞染色法(IPMA)检测抗体的免疫活性。结果显示,成功表达了rpCDK2蛋白,该蛋白以可溶性和包涵体两种形式存在,可溶性rpCDK2蛋白分子质量约为38 ku,包涵体rpCDK2蛋白在38~43 ku间有3种不同分子质量形式;IPMA检测结果显示,所制备的pCDK2蛋白多克隆抗体与猪肾细胞(PK-15)和猪睾丸细胞(ST)免疫染色呈特异性反应,且Western blotting分析显示,多克隆抗体与这两种细胞的总蛋白反应出现4条特异性条带(分子质量在34~50 ku之间),可能跟pCDK2的多种磷酸化形式有关。本试验利用原核表达系统成功制备了rpCDK2蛋白,并制备了免疫活性和特异性良好的pCDK2蛋白多克隆抗体,为该蛋白生物学功能及相关疾病研究提供了基础材料。     

Prokaryotic Expression and Polyclonal Antibody Preparation of σC Protein of Novel Duck Reovirus DH13 Strain

The aims of the experiment was to optimize the prokaryotic expression system of σC protein,prepare polyclonal antibody against σC protein of novel duck reovirus (NDRV),and evaluate the titer of the antibody.The σC gene of NDRV-DH13 strain was amplified by RT-PCR,ligated into pET-30a(+) and pET-32a(+) expression vector,constructed prokaryotic expression plasmid,which were transformed into E.coli BL21(DE3) and the expression of the σC protein were induced by IPTG.The proteins expression were analyzed by SDS-PAGE.The recombinant protein without His tag was purified by digestion,and the recombinant protein with His-tagged was purified by Ni-NTA column.Then the polyclonal antibody was obtained from rabbits which had been immunized by the purified protein without His tag.Anti-His-labeled mAb and NDRV-σC positive serum were used as primary antibodies to evaluate antibodies specificity,the antibodies titer was detected by indirect ELISA (iELISA).SDS-PAGE results showed that the molecular weight of the expression on recombinant proteins were 34 and 37 ku respectively,the proteins were highly expression.Western blotting showed that they had the specific reaction and the prepared antibodies had higher affinity with σC protein,the titer were about 1:25 600 by iELISA detection.This study successfully constructed and optimized the prokaryotic expression system of the polyclonal antibody against σC protein,laid a foundation for the further study of σC protein and the research of genetically engineered vaccine.     

新型鸭呼肠孤病毒DH13株σC蛋白的原核表达及其多克隆抗体制备

试验旨在建立新型鸭呼肠孤病毒（NDRV）σC蛋白的原核表达系统,制备σC蛋白的多克隆抗体,并评估所制备抗体的效价。通过RT-PCR方法扩增获得NDRV DH13株σC基因,连接至pET-30a（+）及pET-32a（+）载体中,构建原核表达质粒,并将其转化大肠杆菌BL21（DE3）感受态细胞,经IPTG诱导获得两种σC重组蛋白,经SDS-PAGE分析蛋白表达形式。利用切胶方法纯化不含His标签σC重组蛋白,利用Ni-NTA柱纯化含His标签σC重组蛋白。以纯化的无His标签蛋白为免疫原免疫兔子获得兔抗σC多克隆抗体,Western blotting分别使用抗His标签的单克隆抗体和NDRV-σC蛋白阳性血清两种一抗评估抗体的特异性,间接ELISA（iELISA）检测抗体滴度。SDS-PAGE结果显示获得34和37 ku两种重组蛋白,且均得到高效表达。Western blotting结果显示制备的多克隆抗体具有良好的特异性,所制备的抗体与σC蛋白亲和力较好。间接ELISA检测结果显示其效价达1：25 600。本试验成功构建σC蛋白的原核表达系统,制备的σC蛋白多克隆抗体为深入研究σC蛋白的生物学功能及开展NDRV基因工程疫苗的研发奠定了基础。     

猪腺病毒3型Hexon蛋白多克隆抗体制备与免疫活性鉴定

本研究旨在制备猪腺病毒3型(PADV-3)Hexon蛋白多克隆抗体.试验构建重组原核表达载体pET28a-Hexon,IPTG诱导重组蛋白的表达并进行Western blotting鉴定,目的蛋白与佐剂混合、乳化制备免疫原,免疫家兔制备Hexon蛋白多克隆抗体.采用免疫过氧化物酶单层细胞染色法(IPMA)检测抗体的免疫活性与抗体滴度.结果显示,Hexon蛋白原核表达以包涵体形式存在,分子质量约为105 ku;真核细胞表达的Hexon蛋白均定位于HEK293细胞质内,细胞核内无分布;IPMA测定所制备的多克隆抗体滴度为1:1 600,该抗体与体外培养的PADV-3及稳定表达Hexon蛋白的细胞均呈特异性反应.结果表明本试验制备的PADV-3型Hexon蛋白多克隆抗体免疫活性和特异性良好.     

牦牛EPF的原核表达及多克隆抗体制备

本试验旨在制备牦牛早孕因子(early pregnancy factor,EPF)多克隆抗体,为牦牛妊娠早期高效快速诊断技术研究奠定基础.采用RT-PCR方法,从牦牛胎盘和卵巢组织中提取RNA,反转录为模板后进行EPF基因扩增,并将其克隆到改造后的载体pET28-His10-Sumo上,构建pET28-His10-Su...     

Preparation,Identification and Purification of Polyclonal Antibody against STa

Enterotoxic Escherichia coli (ETEC) can cause acute diarrhea in human and animals, and its key virulent factor is heat-stable enterotoxin (ST).ST is a peptide with small molecular weight and great toxicity but without immunogenicity, so how to keep its immunogenicity and reduce its toxicity has become a hot research topic for preparing ST toxoid vaccine.In this study, rabbit serum albumin (RSA) was purified by rivanol method and activated in 0.2% glutaraldehyde solution before RSA was conjugated to synthetic methanol-soluble STa, SDS-PAGE result showed that an approximate 108.5 ku complete antigen was obtained.New Zealand White rabbits were immunized with the conjugate four times, the serum was then collected and used to purify immunoglobulin by immunoprecipitation with Protein A/G Plus-Agarose.Dot-ELISA and Western blotting result showed that the titer of the antiserum both reached 1:400.These results indicated that anti-STa polyclonal antibody was successfully prepared, which provided the way for screening of ST structure analogues.