CN109879960A - 黄龙病胶体金多克隆抗体的制备方法 - Google Patents
黄龙病胶体金多克隆抗体的制备方法 Download PDFInfo
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- CN109879960A CN109879960A CN201910142344.9A CN201910142344A CN109879960A CN 109879960 A CN109879960 A CN 109879960A CN 201910142344 A CN201910142344 A CN 201910142344A CN 109879960 A CN109879960 A CN 109879960A
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- filler
- antigen
- yellow twig
- colloidal gold
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Abstract
本发明公开了黄龙病胶体金多克隆抗体的制备方法,包含下列操作步骤:(1)从感染柑橘黄龙病原体的柑橘总DNA中克隆获得柑橘黄龙病毒的表面抗原基因序列,然后对表面抗原基因序列进行氨基酸预分析;(2)抗原制备;(3)抗原蛋白纯化;(4)抗体的制备。本发明制成黄龙病胶体金多克隆抗体操作简单,方便使用,操作人员对技术要求不高,无需进行特殊培训;制成胶体金检测工序简单,短时间内能得出结果;制成胶体金后所用试剂毒性低,对环境污染小。
Description
技术领域
本发明涉及生物技术领域,特别涉及一种黄龙病胶体金多克隆抗体的制备方法。
背景技术
柑橘黄龙病是由一种仅在柑橘韧皮部内寄生的革兰氏阴性细菌引起的病,早期表现为叶产生1~2条黄梢,而后黄梢越来越多,至病株枯死。而目前未有有效的对黄龙病的防护和控制方法,若发现病株则需尽早对患病植株进行移除处理,因此黄龙病早期检测技术的研发具有重大意义。目前黄龙病的快速诊断与检测方法有6种,分别为田间症状诊断、指示植物鉴别、淀粉-碘反应诊断、高光谱成像无损检测、免疫学检测、分子检测。田间症状诊断主要是通过观察柑橘植株的叶子是否出现斑驳型黄化、红鼻子果实等症状判断柑橘是否患黄龙病,此判断方法准确度不高,易与其他病症混淆;指示植物鉴别即利用嫁接的方法把黄龙病病菌转移到对黄龙病病菌极其敏感的植物检测,此过程所需时间长,不能做到快速和早期检测;淀粉-碘反应诊断则是根据黄龙病致病特点(会引起植株韧皮部组织坏死和筛管堵死导致淀粉代谢异常,叶片大量积累淀粉),直接观察叶片样品染色反应判断植株是否感染黄龙病病菌,此方法易因健康叶片上有淀粉干扰出现假阳性,灵敏度低;高光谱成像无损检测通过检测叶片表面及内部化学成分的变化诊断,但易造成误判;其他免疫学检测技术通过制备黄龙病病菌抗体,观察抗原抗体反应显色判断植株是否感染,此前的技术因孵育抗体费时,成本高而无法推广;分子检测技术主要为对样品进行核酸检测,利用PCR技术对核酸进行扩增检测,但此技术需要前期DNA模板的制备,费时、对人员技术有要求。
公开于该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解,而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。
发明内容
本发明针对目前现有免疫学检测技术成本高、操作复杂,不能做到高灵敏度的早期检测、不能做定量分析;分子检测技术需要前期DNA模板的制备,费时、对操作人员有技术要求,DNA提取所用溶剂对人体和环境有毒害的问题,发明一种黄龙病胶体金多克隆抗体的制备方法,通过利用抗原抗体特异性结合这一特性检测黄龙病。胶体金——银标记免疫检测法,即用胶体金标记免疫血清或单克隆抗体,以硝酸银作染色剂,将柑桔叶子的叶脉徒手切片作材料,做定性分析,在6小时内完成检测。
为实现上述目的,本发明提供的技术方案如下:
黄龙病胶体金多克隆抗体的制备方法,包含下列操作步骤:
(1)从感染柑橘黄龙病原体的柑橘总DNA中克隆获得柑橘黄龙病毒的表面抗原基因序列,然后对表面抗原基因序列进行氨基酸预分析:
(a)序列Blast比对,获得氨基酸信息;
(b)进行跨膜域分析;
(c)信号肽序列分析;
(d)无序序列分析;
(e)抗原性分析;
(f)同源性分析;
(2)抗原制备:根据上述分析得到的抗原序列,设计引物,构建大肠杆菌PET-28a的表达载体,构建完成后,诱导的实现分泌表达,破菌分离上清沉淀,取上清液;
(3)抗原蛋白纯化:首先采用金属螯合镍柱进行亲和层析,利用高亲和Ni-NTA纯化介质把螯合剂(氮川三乙酸或NTA)共价偶联到琼脂糖介质(4%交联)上,然后再与上清液螯合Ni2+进行纯化;螯合剂能够通过四个位点牢固的螯合Ni2+从而减少纯化过程中Ni2+泄露到蛋白样品中,纯化后的蛋白在金开瑞验证平台,浓度在1mg/ml的情况下,SDS验证纯度在85%以上;
(4)抗体的制备:纯化后的抗原蛋白注射到两只免疫动物体内,加强免疫多次后,检测血清效价,血清效价达到要求后常规提取抗清血,将所得抗血清流过抗原免疫亲和填料,抗血清中的抗黄龙病抗体与偶联在抗原免疫亲和填料上黄龙病特异吸附,洗掉杂质,用弱酸洗脱,即得黄龙病胶体金多克隆抗体;抗血清效价均超过1:50K,与重组抗原WB检测中,在约84KD处有特异性识别,条带单一、信号强烈。
作为优选,步骤(4)中所述的免疫动物为日本大耳兔。
作为优选,步骤(4)中所述的抗原免疫亲和填料的制备方法包括以下步骤:
(a)取2g赖氨酸溶于10mL 0.1mol/L碳酸钠,充分溶解后加入到25mL过碘酸钠氧化的琼脂糖填料中混匀,60℃反应5min,摇匀再次反应10min,转4℃静置20min,然后加入硼氢化钠100mg混匀还原,室温摇床上摇动过夜,得到赖氨酸琼脂糖填料;
(b)将25mL的赖氨酸琼脂糖填料转移到50mL洁净的空柱子,用500mL蒸馏水漂洗;
(c)先用50mL 50%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再加入50mL 75%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再次加入100mL 100%冷丙酮洗1次;溶液即将完全进入赖氨酸琼脂糖填料层时,加入含有0.2mL三乙胺的20mL丙酮溶液,当溶液还剩1/3在赖氨酸琼脂糖填料层上时,反复震荡重悬琼脂糖珠,即得到重悬好的赖氨酸琼脂糖填料;
(d)取现配的150mg NHS-碘乙酸活性酯,边振荡边加入至步骤(3)得到的重悬好的赖氨酸琼脂糖填料,盖紧,室温避光反应60min;
(e)去除赖氨酸琼脂糖填料中的液体,再用100mL 100%丙酮洗1次,当溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 75%的冷丙酮洗1次,溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 50%的冷丙酮洗1次,当溶液还剩1/3在琼脂糖填料层上时,反复震荡重悬琼脂糖珠;
(f)然后加入200mg的二硫苏糖醇,即得到巯基化琼脂糖填料;
(g)取1/2体积的活性黄龙病组分加入100uL饱和碳酸钠,然后和悬浮在丙酮的巯基琼脂糖珠填料室温反应过夜;
(h)用100mL丙酮清洗,再用400mL含0.05%吐温20的磷酸缓冲液PBSt清洗,即得到的抗原免疫亲和填料。
与现有技术相比,本发明具有如下有益效果:
本发明制成黄龙病胶体金多克隆抗体操作简单,方便使用,操作人员对技术要求不高,无需进行特殊培训;制成胶体金检测工序简单,短时间内能得出结果;制成胶体金后所用试剂毒性低,对环境污染小。
具体实施方式
下面结合具体实施方式进行详细描述,但应当理解本发明的保护范围并不受具体实施方式的限制。
实施例1
抗原免疫亲和填料的制备方法包括以下步骤:
(a)取2g赖氨酸溶于10mL 0.1mol/L碳酸钠,充分溶解后加入到25mL过碘酸钠氧化的琼脂糖填料中混匀,60℃反应5min,摇匀再次反应10min,转4℃静置20min,然后加入硼氢化钠100mg混匀还原,室温摇床上摇动过夜,得到赖氨酸琼脂糖填料;
(b)将25mL的赖氨酸琼脂糖填料转移到50mL洁净的空柱子,用500mL蒸馏水漂洗;
(c)先用50mL 50%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再加入50mL 75%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再次加入100mL 100%冷丙酮洗1次;溶液即将完全进入赖氨酸琼脂糖填料层时,加入含有0.2mL三乙胺的20mL丙酮溶液,当溶液还剩1/3在赖氨酸琼脂糖填料层上时,反复震荡重悬琼脂糖珠,即得到重悬好的赖氨酸琼脂糖填料;
(d)取现配的150mg NHS-碘乙酸活性酯,边振荡边加入至步骤(3)得到的重悬好的赖氨酸琼脂糖填料,盖紧,室温避光反应60min;
(e)去除赖氨酸琼脂糖填料中的液体,再用100mL 100%丙酮洗1次,当溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 75%的冷丙酮洗1次,溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 50%的冷丙酮洗1次,当溶液还剩1/3在琼脂糖填料层上时,反复震荡重悬琼脂糖珠;
(f)然后加入200mg的二硫苏糖醇,即得到巯基化琼脂糖填料;
(g)取1/2体积的活性黄龙病组分加入100uL饱和碳酸钠,然后和悬浮在丙酮的巯基琼脂糖珠填料室温反应过夜;
(h)用100mL丙酮清洗,再用400mL含0.05%吐温20的磷酸缓冲液PBSt清洗,即得到的抗原免疫亲和填料,备用。
黄龙病胶体金多克隆抗体的制备方法,操作步骤如下:
(1)从感染柑橘黄龙病原体的柑橘总DNA中克隆获得柑橘黄龙病毒的表面抗原基因序列,然后对表面抗原基因序列进行氨基酸预分析:
(a)序列Blast比对,获得氨基酸信息,如SEQ ID NO:1所示,其相应的核苷酸序列如SEQ ID NO:2所示;
(b)进行跨膜域分析;
(c)信号肽序列分析;
(d)无序序列分析;
(e)抗原性分析;
(f)同源性分析;
结果表明:uniport以及软件预测均有1跨膜结构,跨膜区预测为21-41AA,无信号肽序列,亲水性好,抗原性较好,截去跨膜区段,截短表达制备抗原;
(2)抗原制备:根据上述分析得到的抗原序列,设计引物SEQ ID NO:3OMPN5:5′-AGCGGATCCCAATTGAAGATGATAGTTCGCT-3′和SEQ ID NO:4OMPN3:5′-AGCAAGCTTTTACACATAATCGGATACATCAT-3′,构建大肠杆菌PET-28a的表达载体,构建完成后,将测序鉴定正确的重组质粒转化表达宿主,挑选含重组质粒的单菌落至3mL LB液体培养基(含抗生素)中,37℃震荡培养至OD600约0.6,取部分菌液作为对照组,余下菌液加入IPTG诱导剂(终浓度0.5mM)诱导的实现分泌表达,37℃震荡培养3h,分别取两组菌液0.15mL,12000×g离心2min,菌体沉淀以40μL 1×loading buffer重悬裂解,SDS-PAGE检测;
2.2蛋白大量表达及破菌检测
A取保存于-20℃的菌种100μL接种于100mL LB液体培养基(含抗生素)中震荡培养过夜;
B取100mL菌液接种于2000mL LB液体培养基中,37℃扩大培养至OD600约0.6,降低培养温度到30℃;
C加入IPTG诱导剂至终浓度0.5mM,30℃继续震荡培养3-4h;
D8000rpm离心3min收集菌体,重悬于50mL预冷NTA-0缓冲液中,冰浴30min;
E超声破碎菌体,参数设置为功率200W、工作3s、暂停4s、时间25-30min;
F16000rpm 4℃离心50min,收集上清以及沉淀;
G取上清进行SDS-PAGE检测;
(3)抗原蛋白纯化:首先采用金属螯合镍柱进行亲和层析,利用高亲和Ni-NTA纯化介质把螯合剂(氮川三乙酸或NTA)共价偶联到琼脂糖介质(4%交联)上,然后再与上清液螯合Ni2+进行纯化;螯合剂能够通过四个位点牢固的螯合Ni2+从而减少纯化过程中Ni2+泄露到蛋白样品中,纯化后的蛋白在金开瑞验证平台,浓度在1mg/ml的情况下,SDS验证纯度在85%以上;
(4)抗体的制备:纯化后的抗原蛋白注射到两只免疫日本大耳兔体内,加强免疫多次后,检测血清效价,血清效价达到要求后常规提取抗清血,将所得抗血清流过上述备用的抗原免疫亲和填料,抗血清中的抗黄龙病抗体与偶联在抗原免疫亲和填料上黄龙病特异吸附,依次用10倍填料体积的PBSt、10倍填料体积的1mol/L氯化钠清洗掉杂质后,柱上的特异性黄龙病抗体用1.5%乙酸洗脱,洗掉杂质,即得黄龙病胶体金多克隆抗体;抗血清效价均超过1:50K,与重组抗原WB检测中,在约84KD处有特异性识别,条带单一、信号强烈。
实施例2
黄龙病胶体金多克隆抗体的检测
效价检测
用间接ELISA法对抗体进行检测。所用二抗为辣根过氧化物酶标记的羊抗兔IgG,阴性对照为PBSt溶液。以阴性OD值不大于0.15,以最大OD值的一半对应的抗体浓度为抗体效价,检测结果见表1。
表1间接ELISA黄龙病胶体金多克隆抗体效价结果
从表1检测结果可以看出,本发明的方法制备的抗黄龙病胶体金多克隆抗体效价较高,达到72ng/mL。
2.2抗体敏感度测定
用间接竞争ELISA法对抗体敏感度进行测定。所用二抗为辣根过氧化物酶标记的羊抗兔IgG,用黄龙病标准品浓度从低到高去竞争酶标孔中的抗体,其OD值与所加入的黄龙病标准品浓度呈负相关。以OD信号抑制率为50%所对应的标准品浓度为敏感度的判断依据,检测数据如表2。
表2间接竞争ELISA检测抗黄龙病抗体敏感度结果
从表2可以看出,本发明的方法制备的抗黄龙病胶体多克隆抗体敏感性很好,达到29.73ng/mL。
前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。这些描述并非想将本发明限定为所公开的精确形式,并且很显然,根据上述教导,可以进行很多改变和变化。对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用,从而使得本领域的技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。本发明的范围意在由权利要求书及其等同形式所限定。
序列表
<110> 广西益谱检测技术有限公司,广西泰格瑞科技有限公司
<120> 黄龙病胶体金多克隆抗体的制备方法
<130> 北京中誉威圣知识产权代理有限公司
<160> 4
<170> SIPOSequenceListing 1.0
<210> 1
<211> 737
<212> PRT
<213> Candidatus Liberibacter spp
<400> 1
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<210> 2
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agcaagcttt tacacataat cggatacatc at 32
Claims (3)
1.黄龙病胶体金多克隆抗体的制备方法,其特征在于,包含下列操作步骤:
(1)从感染柑橘黄龙病原体的柑橘总DNA中克隆获得柑橘黄龙病毒的表面抗原基因序列,然后对表面抗原基因序列进行氨基酸预分析:
(a)序列Blast比对,获得氨基酸信息;
(b)进行跨膜域分析;
(c)信号肽序列分析;
(d)无序序列分析;
(e)抗原性分析;
(f)同源性分析;
(2)抗原制备:根据上述分析得到的抗原序列,设计引物,构建大肠杆菌PET-28a的表达载体,构建完成后,诱导的实现分泌表达,破菌分离上清沉淀,取上清液;,
(3)抗原蛋白纯化:首先采用金属螯合镍柱进行亲和层析,利用高亲和Ni-NTA纯化介质把螯合剂共价偶联到琼脂糖介质(4%交联)上,然后再与上清液螯合Ni2+进行纯化;
(4)抗体的制备:纯化后的抗原蛋白注射到两只免疫动物体内,加强免疫多次后,检测血清效价,血清效价达到要求后常规提取抗清血,将所得抗血清流过抗原免疫亲和填料,抗血清中的抗黄龙病抗体与偶联在抗原免疫亲和填料上黄龙病特异吸附,洗掉杂质,用弱酸洗脱,即得黄龙病胶体金多克隆抗体。
2.根据权利要求1所述的黄龙病胶体金多克隆抗体的制备方法,其特征在于:步骤(4)中所述的免疫动物为日本大耳兔。
3.根据权利要求1所述的黄龙病胶体金多克隆抗体的制备方法,其特征在于,步骤(4)中所述的抗原免疫亲和填料的制备方法包括以下步骤:
(a)取2g赖氨酸溶于10mL 0.1mol/L碳酸钠,充分溶解后加入到25mL过碘酸钠氧化的琼脂糖填料中混匀,60℃反应5min,摇匀再次反应10min,转4℃静置20min,然后加入硼氢化钠100mg混匀还原,室温摇床上摇动过夜,得到赖氨酸琼脂糖填料;
(b)将25mL的赖氨酸琼脂糖填料转移到50mL洁净的空柱子,用500mL蒸馏水漂洗;
(c)先用50mL 50%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再加入50mL 75%的冷丙酮洗1次,当溶液即将完全进入赖氨酸琼脂糖填料层时,再次加入100mL100%冷丙酮洗1次;溶液即将完全进入赖氨酸琼脂糖填料层时,加入含有0.2mL三乙胺的20mL丙酮溶液,当溶液还剩1/3在赖氨酸琼脂糖填料层上时,反复震荡重悬琼脂糖珠,即得到重悬好的赖氨酸琼脂糖填料;
(d)取现配的150mg NHS-碘乙酸活性酯,边振荡边加入至步骤(3)得到的重悬好的赖氨酸琼脂糖填料,盖紧,室温避光反应60min;
(e)去除赖氨酸琼脂糖填料中的液体,再用100mL 100%丙酮洗1次,当溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 75%的冷丙酮洗1次,溶液即将完全进入琼脂糖珠层时,用含有0.1mol/L HCL的50mL 50%的冷丙酮洗1次,当溶液还剩1/3在琼脂糖填料层上时,反复震荡重悬琼脂糖珠;
(f)然后加入200mg的二硫苏糖醇,即得到巯基化琼脂糖填料;
(g)取1/2体积的活性黄龙病组分加入100uL饱和碳酸钠,然后和悬浮在丙酮的巯基琼脂糖珠填料室温反应过夜;
(h)用100mL丙酮清洗,再用400mL含0.05%吐温20的磷酸缓冲液PBSt清洗,即得到的抗原免疫亲和填料。
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REFSEQ.: "Accession No:WP_045490220,outer membrane protein assembly factor BamA [Candidatus Liberibacter asiaticus]", 《GENBANK DATABASE》 * |
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Cited By (2)
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CN111424018A (zh) * | 2020-01-21 | 2020-07-17 | 华南农业大学 | 一种分泌抗CLas转运蛋白Ctp4单克隆抗体的杂交瘤细胞株4A12及应用 |
CN111424018B (zh) * | 2020-01-21 | 2022-04-08 | 华南农业大学 | 一种分泌抗CLas转运蛋白Ctp4单克隆抗体的杂交瘤细胞株4A12及应用 |
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