CN112625141A - 一种番茄斑萎属病毒的蛋白标准物质及其应用 - Google Patents
一种番茄斑萎属病毒的蛋白标准物质及其应用 Download PDFInfo
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Abstract
一种番茄斑萎属病毒的的蛋白标准物质及其应用,所述蛋白标准物质由如下步骤制得:先获得用于番茄斑萎属病毒的全基因序列,根据序列比较,再获取包含外壳蛋白基因和复制酶基因的融合蛋白表达载体,即XXX‑CR载体;然后将获得外壳蛋白基因和复制酶基因的真核表达载体转入293细胞株中,培养表达,采用冷冻低温冻融,离心,纯化后,获得表达产物分子;接着进行DNaseⅠ消化、纯化后,定量后获得外壳蛋白与复制酶基因的融合表达蛋白标准物质。本发明物质具有稳定性,无生物传染性,耐核糖核酸酶等特性,在番茄斑萎属病毒的蛋白检测中作为标准物质。
Description
技术领域
本申请涉及蛋白标准物质领域,具体而言,涉及本发明涉及一种番茄斑萎属病毒的的蛋白标准物质及其应用。
背景技术
番茄斑萎病毒属是一类值得关注的植物病毒。病毒种类或分离物不断增加,寄主范围也在不断扩大,仅TSWV就能侵染1090种植物,涉及到番茄、辣椒、莴苣等蔬菜作物,花生、豌豆、烟草等重要经济作物及菊花、马蹄莲等许多花卉作物。该属病毒分布于亚洲和美洲大部分地区。造成的危害轻者减产,重者绝收,引起的巨大经济损失已被列为世界危害最大的十种植物病毒之一。番茄斑萎病毒属是近年来对我国蔬菜水果等生产危害上升的一类病毒,这类病毒也是国际上植物检疫比较重视的病毒。这类病毒种类繁多,基因组数据缺乏,亲缘关系复杂,对检测方法的准确性提出了极高的要求,这就需要检测实验室储备有检测用的阳性质控。本项目将通过体外转录的方式获得可用作分子生物学检测阳性质控RNA,旨在研究确定这类阳性质控的保存方式、保存条件和运输要求等,为今后病毒分子检测阳性质控的制备进行基础数据的储备,也为促进这一类病毒的检测提供有效准确的阳性质控。目前国内尚无相同类型的阳性质控提供,本项目研发这一类阳性质控可以弥补国内服务的缺失,也可以降低从国外购外的成本,同时由于这类阳性质控丧失侵染活性,也降低了有害生物引进带来的风险。
分子生物学检测是病毒检测中必不可少的组成部分,然而检测的阳性质控却是难以获得,对方法的验证和检测的开展都极为不利。目前,实验室和研究机构想要获得植物病毒的标准样品主要有三个途径:通过从国际权威或著名生物标准品中心进行购买,比如美国标准省物品收藏中心、英国国家生物制品鉴定所和德国微生物菌种包藏中心等;与在研究刊物上发表研究文献的实验室联系索取而获得;购买商业试剂盒所配备的阳性对照,但多为血清学方法的对照。由于获得植物病毒分离物的来源信息少,本地扩繁和保存难度大,且毒株多为活体或是冷冻保存,都存在运输周期长,费用高、保存难等问题,加上检疫性植物病毒进口手续繁琐,因此想要收集病毒的阳性质控极为困难。分子生物学检测需要的仅为病毒基因组,较活性病毒的要求降低,通过基因工程的方法易获得大量的分子拷贝,较接种寄主植物等传统活性病毒繁殖的环境要求和周期都大大降低,因此均有开展的便利性。国内已有动物病毒分子生物学检测阳性质控的研发,如水中轮状病毒实时定量PCR阳性质控构建的研究,但在植物病毒领域,尤其是植物检疫病毒,都缺乏相关研究的报道和产品的面世。
发明内容
为了填补目前产品的空白和满足植物检验检疫的需要,本发明旨在开发能够适用于番茄斑萎属病毒主要病毒分子生物学检测的阳性质控。该物质具有稳定性,无生物传染性,耐核糖核酸酶等特性,可最大程度检测病毒组分以及病毒粒子结构。
一种番茄斑萎属病毒的蛋白标准物质,通过真核表达载体pcDNA3.1转入哺乳动物细胞293表达株中,经培养发酵获得表达产物分子,将获得的表达产物颗粒进行DNase I消化,离心弃沉淀,沉淀即是含有外壳蛋白和复制酶基因的表达产物,再经过His标签的亲和纯化、分子筛纯化,获得含有所需组分的纯化组分,将最终纯化产物进行稀释,对融合蛋白产物进行OD值测定,依据OD值换算稀释产物,获得病毒外壳蛋白和复制酶基因融合表达的标准蛋白物质,所述pcDNA3.1-RP载体为包含番茄斑萎属病毒的外壳蛋白和复制酶融合蛋白的表达载体。
获取包含番茄斑萎属病毒的外壳蛋白和复制酶融合蛋白的表达载体,具体过程如下:
1)根据复制酶基因序列,设计一对特异性引物,所述一对特异性引物为:
RdRp-F:5’-ATGAACATCCAGAAAATACAAA-3’
RdRp-R:5’-GACTTCAGATTTGATCTTTTGAG-3’;
预期扩增产物为TSWV的复制酶蛋白N端约100氨基酸,即复制酶基因,并引入酶切位点BstXI;分别双酶切复制酶基因;
2)根据外壳蛋白基因序列,设计一对特异性引物,所述一对特异性引物为:
CP-F:5’-ATGTCTAAGGTTAAGCTCACTAAGGA-3’
CP-R:5’-ACAGACAAAACTTGCAGAACTTGCT-3’;
预期扩增产物为TSWV的外壳蛋白,即CP基因,并引入酶切位点:EcoRV,通过融合引物进行重叠PCR扩增,获得复制酶基因与外壳蛋白基因融合的DNA片段,并进行BstXI/EcoRV双酶切后回收纯化,
BstXI/EcoRV双酶切pcDNA3.1载体,并将CP基因和复制酶基因融合后连接到PET32a载体上,最终得到pcDNA3.1-RP载体;所述融合基因序列如序列表中SEQ ID N0.3所示。
用于病毒检测的外壳蛋白基因序列片段,如序列表中SEQ ID N0.1所示,所述基因为TSWV外壳蛋白基因中的一个片段。
用于病毒检测的复制酶基因序列片段,如序列表中SEQ ID N0.2所示,所述基因为TSWV复制酶基因中的一个片段。
表达产物分子进行DNase I消化,然后离心弃沉淀,保留上清;加入终浓度50%饱和硫酸铵,沉淀表达产物,离心弃上清,获得沉淀即是含有外壳蛋白和复制酶基因的表达产物,最后用PBS溶液重悬,获得含有所需粗体组分,将获得含有表达产物分子的溶液进行His标签的亲和纯化,经Ni-NTA凝胶介质结合目的蛋白后,用100mM咪唑洗脱所需组分,获得含有所需组分的纯化组分。
所述分子筛纯化为经葡聚糖凝胶介质筛选目的蛋白后,用保存缓冲液换液所需组分,获得含有所需组分的纯化组分,保存缓冲液为20mM Tris、0.1M NaCl、ρΗ8.0。
本发明具有如下优点:
(1)目前,实验室和研究机构想要获得斑萎病毒属病毒的标准样品主要有三个途径:通过从国际权威或著名生物标准品中心进行购买,与在研究刊物上发表研究文献的实验室联系索取而获得;购买商业试剂盒所配备的阳性对照。由于获得植物病毒分离物的来源信息少,本地扩繁和保存难度大,且毒株多为活体或是冷冻保存,都存在运输周期长,费用高、保存难等问题,加上检疫性植物病毒进口手续繁琐,因此想要收集病毒的阳性质控极为困难。本发明提供一种番茄斑萎属病毒的的蛋白标准物质及其应用,可以解决上述难题。
(2)采用病毒外壳蛋白与复制酶基因融合表达的策略,可以同时检测病毒两个基因组分,具有精确性和广谱性。
(3)采用哺乳动物细胞系表达蛋白,与多采用的原核生物表达系统相比,表达产物具有空间折叠准确,蛋白修饰完整等特性。
(4)本发明利用多步骤的蛋白纯化方法,首先用饱和硫酸铵对标准物质进行提纯。硫酸铵溶解度大、温度系数小且不易是蛋白质变性,用它对标准物质进行沉析,并可以进一步去除DNA核酸的干扰。
(5)本发明的标准物质只含有病毒外壳蛋白和复制酶蛋白,不含有病毒的核酸,因此该标准物质无传染性,无病毒特性,易于存储与运输。
附图说明
此处所说明的附图用来提供对本申请的进一步理解,构成本申请的一部分,本申请的示意性实施例及其说明用于解释本申请,并不构成对本申请的不当限定。在附图中:
图1.用于真核生物表达的载体图。
图2.本发明所示融合蛋白的结构。
图3.本发明组分在293细胞中的表达检测。
图4.分子筛纯化峰图。
图5.最终纯化产物的蛋白电泳图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的,决不作为对本发明及其应用或使用的任何限制。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例一、TSWV病毒外壳蛋白与复制酶基因的融合
选取的外壳蛋白基因以及复制酶基因特定区域,用特异引物扩增,
RdRp-F:5’-ATGAACATCCAGAAAATACAAA-3’和
RdRp-R:5’-GACTTCAGATTTGATCTTTTGAG-3’;
CP-F:5’-ATGTCTAAGGTTAAGCTCACTAAGGA-3’和
CP-R:5’-ACAGACAAAACTTGCAGAACTTGCT-3’获得复制酶基因片段和外壳蛋白基因全长,按图2所示结构,设计融合蛋白引物,
RdRp-R:5’-CTCGCTGCCGCTAGAACCACCAGAAGAACCACCAGAGACTTCAGATTTGATCTTTTGAG-3’和
CP-F:5’-TCTGGTGGTTCTTCTGGTGGTTCTAGCGGCAGCGAGATGTCTAAGGTTAAGCTCACTAAGGA-3-进行通过蛋白
linker(SGGSSGGSSGSE)进行连接,其中画线序列蛋白Linker序列。
并用RdRp RdRp-F:5’-ATGGGTCATCATCACCATCACCATATGAACATCCAGAAAATACAAA-3’引入His Tag序列。
采用相同方法,获得复制酶基因与外壳蛋白融合的不同结构,包括RdRp-Liner-CP,CP-Linker-RdRp,CP-Linker-RdRp-Linker-CP等。
实施例二、融合蛋白的制备
将表达载体转入293细胞系,经过培养发酵后,收集细胞,按照方法,破碎细胞,离心获得含表达产物的上清。
实施例三、标准物质的检测
将实施例1获取的标准物质经紫外分光光度计测定,依据OD值换算出标准物质病毒数值,测定出初始浓度病毒80次方,
证明利用该标准物质可用于TSWV的定量分析。
以上仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
序列表
<110> 昆明海关技术中心
<120> 一种番茄斑萎属病毒的蛋白标准物质及其应用
<141> 2020-12-23
<160> 3
<170> SIPOSequenceListing 1.0
<210> 1
<211> 777
<212> DNA
<213> Artificial Sequence
<400> 1
atgtctaagg ttaagctcac taaggaaaac attgttgctt tgttgacaca aggcaaagat 60
cttgaatttg aagaagatca gaatctggta gcatttaact tcaagacttt ttgtctggaa 120
aaccttgacc agatcaagaa gatgagcatt atttcatgtc tgacattcct gaagaatcgt 180
cagagtatag tgaaggttat taagcaaagt gattttactt ttggcaaaat cactataaag 240
aaaacttcag acaggattgg agccactgac atgaccttca gaaggcttga tagcttgatc 300
agggtcaggc ttgtcgagga aactgggaat tctgagaacc tcaatactat caaatctaag 360
attgcttctc accctctgat tcaagcctat ggattacctc ttgatgatgc aaagtctgtg 420
aggcttgcca taatgctggg aggtagctta cctcttattg cttcagttga tagctttgag 480
atgatcagtg ttgtcttggc tatatatcag gatgcaaaat acaaagacct cgggatcgat 540
ccaaagaagt atgacaccag ggaagcctta ggaaaagttt gcactgtgct aaaaagcaaa 600
gcatttgaaa tgaatgaaga tcaggtgaag aaagggaaag agtatgctgc tatacttagc 660
tccagcaatc ctaatgctaa aggaagtatt gctatggaac attacagtga aactcttaac 720
aagttctatg aaatgttcgg ggttaaaaaa cagacaaaac ttgcagaact tgcttaa 777
<210> 2
<211> 8637
<212> DNA
<213> Artificial Sequence
<400> 2
atgaacatcc agaaaataca aaaattaata gagaatggaa ctactttatt gttatctatt 60
gaggattgtg taggttctaa tcacgaccta gctttggatt tacataagag aaatagtgat 120
gagatcccag aagatgtgat tattaataat aatgcaaaaa attatgagac gatgagagag 180
ttaattgtca aaatcactgc tgatggagaa ggactaaaca aagggatggc aactgtagac 240
gtcaagaagt taagtgagat ggtttctctg tttgagcaaa aatacctaga aacagagtta 300
gcaaggcatg atatttttgg agagctgatc tccaggcacc tgagaataaa gcccaaacaa 360
agaagtgaag tggagataga gcatgcgctc agagaatatc tggatgaact taacaaaaag 420
tcctgcatta ataagctctc tgatgatgag tttgagagaa taaataaaga atatgtggca 480
actaacgcca cacctgacaa ctatgtgata tataaagaat caaaaaacag tgagctttgt 540
ttaatcattt atgattggaa aatatctgtc gatgccagga cagaaactaa acaatggaga 600
aatacctaca aaaatatctg gaaatctttc aaagatataa aagtgaatgg aaagccattc 660
ctggaagatc accctgtttt cgtttctata gttatattga aacctattgc tgggatgcca 720
atcactgtta ctagcagcag ggttttggag aaatttgaag attctccatc agcattgcat 780
ggagaaagaa taaagcatgc tagaaatgcc aaattgctaa atatttctca tgttgggcaa 840
atagttggaa ccacacccac agtggtgaga aactattatg caaacactca aaagatcaaa 900
tctgaagtca gaggaatact aggtgatgat tttggatcta aagatgtgtt ttttagtcac 960
tggaccagca aatacaaaga aagaaatcct actgaaatag cctattctga agatattgaa 1020
agaataattg attcacttgt tacagatgaa ataactaaag aggaaataat acattttttg 1080
tttggaaatt tctgtttcca cattgaaaca atgaatgacc agcatatcgc tgacgaattt 1140
agagggtacc aaaactcttg tatcaattta aaaatagagc caaaagttga tttagctgat 1200
ttgaaggacc acttaatcca gaagcagcaa atatgggaat ctctgtatgg gaaacatctt 1260
gagaaaatca tgcttagaat tagagggaaa aagaaaaaag aaaaagaaat acctgacata 1320
accacagctt ttaaccagaa tgctgctgaa tatgaagaaa agtacccaaa ctgttttaca 1380
aatgatctct ctgaaactaa aactaacttt tctatgactt ggtccccaag ttttgaaaaa 1440
atagaattga gctcagaggt agattacaac aacgcaatta taaacaagtt tcgggaaagc 1500
ttcaaaagtt cttcaagggt tatttataat ggcccatata gtagcataaa taaccaaaca 1560
aataaagcaa gagatataac aaacttagtt agactgtgtt taacagagct aagttgtgat 1620
acaacaaaaa tggaaaagca ggagcttgag gatgaaatag atataaacac tgggagtatt 1680
aaagttgaga gaacaaaaaa atctaaagaa tggaataagc agggttcgtg tttaaccagg 1740
aacaaaaatg aattttgcat gaaagagaca ggcagggaga acaaaactat ctattttaaa 1800
ggcttagcag taatgaatat aggaatgagt tctaaaaaaa gaattctaaa aaaagaagaa 1860
ataaaagaga ggatttctaa aggcttggaa tatgatacct ctgaaaggca ggctgaccca 1920
aatgatgatt attcaagtat agacatgtca tctctgactc atatgaaaaa actgataaga 1980
catgacaacg aggatagctt aagctggtgt gaaaggatta aggactcttt gtttgttctt 2040
cataatggtg atataagaga ggaaggcaag atcacatctg tttacaataa ttatgctaaa 2100
aatcctgaat gcttgtacat tcaagattca gtactgaaaa ctgaattaga gacttgcaaa 2160
aagataaaca aattatgcaa tgacctagcc atttaccatt actctgaaga catgatgcaa 2220
ttctccaaag gtttaatggt ggctgacagg tacatgacca aagaaagttt caaaatacta 2280
accacagcaa atacgagcat gatgctattg gcattcaaag gagatggaat gaacaccgga 2340
ggatcaggag ttccttacat agcattgcat atagtggatg aagacatgtc agatcaattt 2400
aacatatgtt atactaaaga aatttatagc tatttccgaa atggtagtaa ttacatttat 2460
ataatgagac cacagagact caatcaggtg aggctgctaa gccttttcaa aacgcctagt 2520
aaagttcctg tatgttttgc acaattttca aagaaagcta acgaaatgga aaaatggctg 2580
aaaaacaaag atatagaaaa agtaaatgtc ttttctatga caatgactgt aaaacagata 2640
ttaataaata ttgtgttttc atctgtcatg ataggaactg tgacaaagct cagcaggatg 2700
ggaatttttg acttcatgcg gtatgcaggt tttttgccac tgtctgatta ttctaatata 2760
aaagagtaca ttagagacaa atttgatcct gatataacca actgtggcag atatctattt 2820
cgtaatggaa tcaaaaagct attgttcaga atggaagatc tcaatttaag cacaaatgcc 2880
aagcctgttg ttgtagatca cgaaaatgat attataggag ggataacaga cttgaatata 2940
aaatgtccaa taacaggatc aactctactg actcttgagg atttgtataa taatgtctat 3000
ttggctattt acatgatgcc taaatcattg cacaatcacg ttcacaatct aacaagcttg 3060
ttaaatgtcc ctgctgagtg ggagctaaag ttcagaaaag agttaggttt caacatattt 3120
gaggacatat accctaagaa agcaatgttt gatgacaaag acctattctc tataaatgga 3180
gctttgaacg tgaaagcatt atctgattac tatctaggaa atatagaaaa tgtgggtttg 3240
atgagatcag aaatagaaaa taaagaagat tttctaagcc cttgttataa aatatctact 3300
ttaaaatctt caaaaaaatg ctcgcagtca aacattataa gtactgatga gacaatagag 3360
tgtctccaga atgcaaagat ccaagatata gaaaattgga aaggaaataa cctggccatt 3420
ataaaagggc ttataagaac ctacaatgag gagaaaaaca gattggtgga attttttgaa 3480
gataattgtg tcaattcact gtatcttgta gaaaagctta aagagataat taatagtgga 3540
tcaataactg tagggaaatc cgtaacatct aaatttataa gaaataacca tcctttaaca 3600
gtagaaacat atctcaaaac aaaactatat tatagaaata atgtgactgt tttaaagtct 3660
aaaaaagtat cagaggagct ttatgacctt gtaaaacagt ttcataacat gatggaaata 3720
gacttagatt ctgttatgaa ccttgggaaa ggtacagaag gaaaaaaaca cacattcttg 3780
cagatgcttg aatttgtcat gtccaaagct aaaaatgtca ccgggtctgt agattttcta 3840
gtttctgttt ttgaaaaaat gcagagaacc aaaacagaca gagaaatata cttgatgagt 3900
atgaaagtga aaatgatgct ttattttata gagcacacat tcaaacatgt tgcgcagagt 3960
gatccatcag aagccatatc tataagtgga gacaataaaa taagggcact ttctacatta 4020
tctttggaca caatcacgtc ttacaacgac attttaaaca aaaattcaaa gaagtcaaga 4080
ttggctttcc tgtctgctga tcaatcgaaa tggtcggcat cagaccttac ctataaatat 4140
gttttagcta tcatattaaa tccaatttta actactggtg aagctagttt aatgatagaa 4200
tgtattttaa tgtatgttaa attgaagaag gtttgtatac caacagatat ttttttgaat 4260
ctaagaaaag ctcaaggaac tttcgggcaa aatgaaactg ccataggact tttgactaaa 4320
ggtttgacga caaacacata ccctgttagc atgaactggt tacaaggcaa tttaaattat 4380
ctgtcttctg tttatcattc ttgtgcaatg aaagcttatc acaagacttt agaatgctac 4440
aaagactgtg atttccaaac tagatggatt gtgcactctg atgataatgc gacatcattg 4500
atagccagtg gagaggtcga taaaatgcta acagactttt caagctcatc tctgccagaa 4560
atgttgttta gaagcattga agctcatttc aaaagctttt gcataacttt gaacccaaaa 4620
aagagttatg cttcttcatc agaagtagag tttatatctg aaagaattag taaatggagc 4680
aattattcct ctctattgca gacatttagc aaattgttgc acagaatctt cacatataag 4740
ttatttgatg atctaatgtc actaagtata catgttacga tgcttctgag aaaaggctgt 4800
cctaatgaag ttataccttt tgcttatggg gctgtacagg tacaagcatt aagcatctat 4860
tcaatgcttc ctggtgaagt gaatgatagc atcagaattt ttaagaagct tggagtaagt 4920
ttaaagtcaa acgagattcc cacaaacatg gggggctggt tgacttctcc tatagagcca 4980
ttgtctatat taggtccatc atcgaatgat caaatcatct attacaatgt gataagagat 5040
tttttgaaca aaaaaagttt agaggaagta aaagatagcg tctcttcttc cagctatcta 5100
cagatgagat tcagagagct aaaaggaaag tatgaaaaag gaactctgga agaaaaagat 5160
aaaaagatga tatttcttat caatctgttt gagaaagcat cagtgtctga agattcagac 5220
gttctaacaa tcgggatgaa atttcaaact atgttaactc agattataaa attgcccaat 5280
tttataaatg agaatgcttt aaacaagatg tcaagttata aagatttttc aaaactttac 5340
cctaatttga aaaagaatga agatttatat aaaagtacta agaacttaaa gatagacgag 5400
gatgctattt tagaggaaga tgagttatat gagaagattg catctagctt agaaatggaa 5460
tctgttcatg acataatgat aaaaaatcct gaaacaattc tgatagcacc attgaatgat 5520
agagattttt tacttagtca gctgttcatg tacacaagcc cttctaaaag gaatcagtta 5580
tctaaccaat ctacagagaa acttgctttg gatagagtat taaggtcgaa agctagaaca 5640
tttgtagaca tttcttccac tgtgaagatg acttatgaag aaaacatgga aaagaaaatc 5700
ttggaaatgc taaaatttga tttagattca tattgttcat ttaaaacatg tgtaaatcta 5760
gtgatcaagg atgttaattt cagcatgctg attccaatat tggattctgc atacccttgt 5820
gaatctagga aaagagataa ctacaatttc aggtggtttc agactgagaa gtggatacct 5880
gttgttgaag gctctccggg attagtggta atgcatgctg tctatggatc aaattatata 5940
gaaaatttag gtttaaaaaa catccctcta acagacgata gcattaatgt tttaacaagc 6000
acgtttggaa caggtttaat catggaggat gtaaaatcct tagttaaagg caaagacagc 6060
ttcgaaacag aggctttcag caattctaac gaatgtcaaa gattggtgaa agcatgcaat 6120
tatatgatag cagcacaaaa caggctttta gcaattaaca catgctttac taggaaaagc 6180
ttccccttct attctaaatt caacctaggg agagggttta tctcaaacac attagctctc 6240
ttatccacca tctacagtaa agaagaatcc tatcattttg tttctacagc tagttataaa 6300
ttagacaaaa ctattagaac tgtgataagt gctcagcaag atatgaactt agagaaaata 6360
ctggacactg ctgtatacat atcagataaa ttgcagtcac ttttcccaac aattacaaga 6420
gaggatatag ttttgatatt gcaaaatgtg tgcctagaca gcaaacctat atggcagagt 6480
ctagaagaca aaatgaaaaa gattaacaat tcaacagcaa gcggcttcac agtgtcaaat 6540
gtgattctgc cacataacag tgaattgaac acaatccaga aacaaattgt ctggatgtgg 6600
aacatgggtt tatgttctca tagaacatta gattttgtta tcaggtatat taggagaagt 6660
gatgtaagat atgtgaaaac tgaagaacaa gacgaatcac gaaattatat ctctggaact 6720
atgtacaaaa tcgggatcat gacaagaagc tgttatgttc aattgatagc atctgatcaa 6780
gatgtagcag tttctttgag gacaccattt gagatattga atgaaagaga ttatcttttt 6840
gacacataca gagaaagtat agagaaatta ttgcagaaat ttatgtttga taaagtgaac 6900
ataataaatc aaacaaccac agattgtttt cctagaacca ggagatgctg catcagaatg 6960
accacagaca acaagatgat tgtaaaggtt aatgccacat caagacaaat aagactagag 7020
aatgtgaaat tagttgtgaa gataaaatat gaaaacgtga actccgatgt gtgggatatt 7080
atagaaagcc aaaaatctct agtcttaagg ctccctgaag taggggaatg tttctctgat 7140
atgtacaaaa ctgcagactc tgaaactgaa acaatcaaaa ccataaaaaa caggcttatg 7200
acttctttaa ctttcataga agcctttgga accttatcac agcagatcaa agagatcgtg 7260
gatgatgata tcagagaaac gatggatgaa ttcttaatga acatccggga tacctgctta 7320
gaaggtttgg aaaactgcaa aagtgtggaa gaatatgata gctatcttga tgaaaatggg 7380
tttaatgata cagtagaact attcgaaaac ttgttaagaa cacatgacaa ctttgcaaat 7440
gagtatagtc ctctgttttc agagattgtt gacaaagcaa aacagtatac tagagattta 7500
gaaggtttca aagaaatact gctcatgctt aaatattctt tgataaatga tgcatcagga 7560
tttaaaagct atagagccac tggaatgcat gctgtcgaac taatggcaaa aaagcacata 7620
gagatagggg aattcaactt gctaggaatg atccaactga ttaaagcttg cgaaacatgc 7680
cacaacaatg actctatatt aaacttagca agtttgagga atgttcttag caggacatat 7740
gccacatttg ggagaagaat aagattgaat catgatctgg atttgcaaaa taacttgatg 7800
gaaaaaagtt atgatttcaa gacactggtt ttaccagaaa taaaattatc agaactatca 7860
agggagatac taaaagagaa tgggtttgtt atatctggag agaatctaaa aatggatagg 7920
tctgatgaag aatttgaagg tcttgccagt tttaatgtgt tgaggctaga tgaggaagaa 7980
atgtatgaag gtttgatcaa agaaatgaag attaaaagaa aaaagaaagg gtctttattc 8040
ccggcaaata cacttttact aagtgagttg ataaagttct tgattggagg gataaaggga 8100
accagttttg atatagagac attgttgcgg aatagtttta gaccagacat attttcaact 8160
gacagactgg gcagattaag ttccagtgta cctgcactca aagtttatgc aactgtttat 8220
atggaatata agaatgtcaa ttgtccttta aatgagatag ctgacagctt agaaggttat 8280
ctaaaactga caaaaagcaa gtctaaggag catttcttat ctggaagagt taagaaagct 8340
ttgatacaat taagagatga acaatcgcga actaaaaaac tagaggtcta taaagatatc 8400
gcaaatttcc tttctaggca cccattatgc ttatcagaaa aaacattgta tggaagatac 8460
acttactctg atatcaatga ttatatcatg caaacaagag agattatttt gagtaaaata 8520
agtgtgttgg atgaggttgt tgaaacagat gaagacaatt tcttgcttag ttatctaaga 8580
ggggaagaag atgcctttga cgaagatgat tctgatgaag aagaagacac ggattaa 8637
<210> 3
<211> 581
<212> PRT
<213> Artificial Sequence
<400> 3
Met Gly His His His His His His Met Asn Ile Gln Lys Ile Gln Lys
1 5 10 15
Leu Ile Glu Asn Gly Thr Thr Leu Leu Leu Ser Ile Glu Asp Cys Val
20 25 30
Gly Ser Asn His Asp Leu Ala Leu Asp Leu His Lys Arg Asn Ser Asp
35 40 45
Glu Ile Pro Glu Asp Val Ile Ile Asn Asn Asn Ala Lys Asn Tyr Glu
50 55 60
Thr Met Arg Glu Leu Ile Val Lys Ile Thr Ala Asp Gly Glu Gly Leu
65 70 75 80
Asn Lys Gly Met Ala Thr Val Asp Val Lys Lys Leu Ser Glu Met Val
85 90 95
Ser Leu Phe Glu Gln Lys Tyr Leu Glu Thr Glu Leu Ala Arg His Asp
100 105 110
Ile Phe Gly Glu Leu Ile Ser Arg His Leu Arg Ile Lys Pro Lys Gln
115 120 125
Arg Ser Glu Val Glu Ile Glu His Ala Leu Arg Glu Tyr Leu Asp Glu
130 135 140
Leu Asn Lys Lys Ser Cys Ile Asn Lys Leu Ser Asp Asp Glu Phe Glu
145 150 155 160
Arg Ile Asn Lys Glu Tyr Val Ala Thr Asn Ala Thr Pro Asp Asn Tyr
165 170 175
Val Ile Tyr Lys Glu Ser Lys Asn Ser Glu Leu Cys Leu Ile Ile Tyr
180 185 190
Asp Trp Lys Ile Ser Val Asp Ala Arg Thr Glu Thr Lys Gln Trp Arg
195 200 205
Asn Thr Tyr Lys Asn Ile Trp Lys Ser Phe Lys Asp Ile Lys Val Asn
210 215 220
Gly Lys Pro Phe Leu Glu Asp His Pro Val Phe Val Ser Ile Val Ile
225 230 235 240
Leu Lys Pro Ile Ala Gly Met Pro Ile Thr Val Thr Ser Ser Arg Val
245 250 255
Leu Glu Lys Phe Glu Asp Ser Pro Ser Ala Leu His Gly Glu Arg Ile
260 265 270
Lys His Ala Arg Asn Ala Lys Leu Leu Asn Ile Ser His Val Gly Gln
275 280 285
Ile Val Gly Thr Thr Pro Thr Val Val Arg Asn Tyr Tyr Ala Asn Thr
290 295 300
Gln Lys Ile Lys Ser Glu Val Ser Gly Gly Ser Ser Gly Gly Ser Ser
305 310 315 320
Gly Ser Glu Met Ser Lys Val Lys Leu Thr Lys Glu Asn Ile Val Ala
325 330 335
Leu Leu Thr Gln Gly Lys Asp Leu Glu Phe Glu Glu Asp Gln Asn Leu
340 345 350
Val Ala Phe Asn Phe Lys Thr Phe Cys Leu Glu Asn Leu Asp Gln Ile
355 360 365
Lys Lys Met Ser Ile Ile Ser Cys Leu Thr Phe Leu Lys Asn Arg Gln
370 375 380
Ser Ile Val Lys Val Ile Lys Gln Ser Asp Phe Thr Phe Gly Lys Ile
385 390 395 400
Thr Ile Lys Lys Thr Ser Asp Arg Ile Gly Ala Thr Asp Met Thr Phe
405 410 415
Arg Arg Leu Asp Ser Leu Ile Arg Val Arg Leu Val Glu Glu Thr Gly
420 425 430
Asn Ser Glu Asn Leu Asn Thr Ile Lys Ser Lys Ile Ala Ser His Pro
435 440 445
Leu Ile Gln Ala Tyr Gly Leu Pro Leu Asp Asp Ala Lys Ser Val Arg
450 455 460
Leu Ala Ile Met Leu Gly Gly Ser Leu Pro Leu Ile Ala Ser Val Asp
465 470 475 480
Ser Phe Glu Met Ile Ser Val Val Leu Ala Ile Tyr Gln Asp Ala Lys
485 490 495
Tyr Lys Asp Leu Gly Ile Asp Pro Lys Lys Tyr Asp Thr Arg Glu Ala
500 505 510
Leu Gly Lys Val Cys Thr Val Leu Lys Ser Lys Ala Phe Glu Met Asn
515 520 525
Glu Asp Gln Val Lys Lys Gly Lys Glu Tyr Ala Ala Ile Leu Ser Ser
530 535 540
Ser Asn Pro Asn Ala Lys Gly Ser Ile Ala Met Glu His Tyr Ser Glu
545 550 555 560
Thr Leu Asn Lys Phe Tyr Glu Met Phe Gly Val Lys Lys Gln Thr Lys
565 570 575
Leu Ala Glu Leu Ala
580
Claims (6)
1.一种番茄斑萎属病毒的蛋白标准物质,其特征在于,通过真核表达载体pcDNA3.1转入哺乳动物细胞293表达株中,经培养发酵获得表达产物分子,将获得的表达产物颗粒进行DNase I消化,离心弃沉淀,沉淀即是含有外壳蛋白和复制酶基因的表达产物,再经过His标签的亲和纯化、分子筛纯化,获得含有所需组分的纯化组分,将最终纯化产物进行稀释,对融合蛋白产物进行OD值测定,依据OD值换算稀释产物,获得病毒外壳蛋白和复制酶基因融合表达的标准蛋白物质,所述pcDNA3.1-RP载体为包含番茄斑萎属病毒的外壳蛋白和复制酶融合蛋白的表达载体。
2.根据权利要求1所述的蛋白标准物质,其特征在于,获取包含番茄斑萎属病毒的外壳蛋白和复制酶融合蛋白的表达载体,具体过程如下:
1)根据复制酶基因序列,设计一对特异性引物,所述一对特异性引物为:
RdRp-F:5’-ATGAACATCCAGAAAATACAAA-3’
RdRp-R:5’-GACTTCAGATTTGATCTTTTGAG-3’;
预期扩增产物为TSWV的复制酶蛋白N端约100氨基酸,即复制酶基因,并引入酶切位点BstXI;分别双酶切复制酶基因;
2)根据外壳蛋白基因序列,设计一对特异性引物,所述一对特异性引物为:
CP-F:5’-ATGTCTAAGGTTAAGCTCACTAAGGA-3’
CP-R:5’-ACAGACAAAACTTGCAGAACTTGCT-3’;
预期扩增产物为TSWV的外壳蛋白,即CP基因,并引入酶切位点:EcoRV,通过融合引物进行重叠PCR扩增,获得复制酶基因与外壳蛋白基因融合的DNA片段,并进行BstXI/EcoRV双酶切后回收纯化,
BstXI/EcoRV双酶切pcDNA3.1载体,并将CP基因和复制酶基因融合后连接到PET32a载体上,最终得到pcDNA3.1-RP载体;所述融合基因序列如序列表中SEQ ID N0.3所示。
3.根据权利要求2所述的蛋白标准物质,其特征在于,用于病毒检测的外壳蛋白基因序列片段,如序列表中SEQ ID N0.1所示,所述基因为TSWV外壳蛋白基因中的一个片段。
4.根据权利要求2所述的蛋白标准物质,其特征在于,用于病毒检测的复制酶基因序列片段,如序列表中SEQ ID N0.2所示,所述基因为TSWV复制酶基因中的一个片段。
5.根据权利要求1所述的蛋白标准物质,其特征在于,表达产物分子进行DNase I消化,然后离心弃沉淀,保留上清;加入终浓度50%饱和硫酸铵,沉淀表达产物,离心弃上清,获得沉淀即是含有外壳蛋白和复制酶基因的表达产物,最后用PBS溶液重悬,获得含有所需粗体组分,将获得含有表达产物分子的溶液进行His标签的亲和纯化,经Ni-NTA凝胶介质结合目的蛋白后,用100mM咪唑洗脱所需组分,获得含有所需组分的纯化组分。
6.根据权利要求1所述的蛋白标准物质,其特征在于,所述分子筛纯化为经葡聚糖凝胶介质筛选目的蛋白后,用保存缓冲液换液所需组分,获得含有所需组分的纯化组分,保存缓冲液为20mM Tris、0.1M NaCl、ρΗ8.0。
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