CN104151407B - 一种制备人妊娠特异性糖蛋白9的方法 - Google Patents
一种制备人妊娠特异性糖蛋白9的方法 Download PDFInfo
- Publication number
- CN104151407B CN104151407B CN201410376676.0A CN201410376676A CN104151407B CN 104151407 B CN104151407 B CN 104151407B CN 201410376676 A CN201410376676 A CN 201410376676A CN 104151407 B CN104151407 B CN 104151407B
- Authority
- CN
- China
- Prior art keywords
- psg9
- albumen
- people
- recombinant bacterium
- coli
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000035935 pregnancy Effects 0.000 title abstract description 6
- 102100021983 Pregnancy-specific beta-1-glycoprotein 9 Human genes 0.000 claims abstract description 47
- 101000617728 Homo sapiens Pregnancy-specific beta-1-glycoprotein 9 Proteins 0.000 claims abstract description 46
- 108090000623 proteins and genes Proteins 0.000 claims abstract description 30
- 241000894006 Bacteria Species 0.000 claims abstract description 26
- BPHPUYQFMNQIOC-NXRLNHOXSA-N isopropyl beta-D-thiogalactopyranoside Chemical compound CC(C)S[C@@H]1O[C@H](CO)[C@H](O)[C@H](O)[C@H]1O BPHPUYQFMNQIOC-NXRLNHOXSA-N 0.000 claims abstract description 23
- 241000588724 Escherichia coli Species 0.000 claims abstract description 20
- 230000001939 inductive effect Effects 0.000 claims abstract description 14
- 239000006228 supernatant Substances 0.000 claims abstract description 12
- 150000002460 imidazoles Chemical class 0.000 claims abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003480 eluent Substances 0.000 claims abstract description 6
- 230000001580 bacterial effect Effects 0.000 claims abstract description 5
- 239000012149 elution buffer Substances 0.000 claims abstract description 5
- FRXSZNDVFUDTIR-UHFFFAOYSA-N 6-methoxy-1,2,3,4-tetrahydroquinoline Chemical compound N1CCCC2=CC(OC)=CC=C21 FRXSZNDVFUDTIR-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- 238000001742 protein purification Methods 0.000 claims abstract description 3
- 238000010926 purge Methods 0.000 claims abstract description 3
- 239000002773 nucleotide Substances 0.000 claims description 6
- 125000003729 nucleotide group Chemical group 0.000 claims description 6
- 206010028980 Neoplasm Diseases 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 201000011510 cancer Diseases 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 102000004169 proteins and genes Human genes 0.000 description 14
- 235000018102 proteins Nutrition 0.000 description 13
- 230000006698 induction Effects 0.000 description 7
- 239000013598 vector Substances 0.000 description 7
- 101000617720 Homo sapiens Pregnancy-specific beta-1-glycoprotein 5 Proteins 0.000 description 5
- 102100022025 Pregnancy-specific beta-1-glycoprotein 5 Human genes 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000029087 digestion Effects 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 108090000790 Enzymes Proteins 0.000 description 4
- 102000004190 Enzymes Human genes 0.000 description 4
- 238000002415 sodium dodecyl sulfate polyacrylamide gel electrophoresis Methods 0.000 description 4
- 102100025475 Carcinoembryonic antigen-related cell adhesion molecule 5 Human genes 0.000 description 3
- 102000005789 Vascular Endothelial Growth Factors Human genes 0.000 description 3
- 108010019530 Vascular Endothelial Growth Factors Proteins 0.000 description 3
- 239000003550 marker Substances 0.000 description 3
- 239000013612 plasmid Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 108010022366 Carcinoembryonic Antigen Proteins 0.000 description 2
- 238000002965 ELISA Methods 0.000 description 2
- 101000617725 Homo sapiens Pregnancy-specific beta-1-glycoprotein 2 Proteins 0.000 description 2
- 108010009583 Transforming Growth Factors Proteins 0.000 description 2
- 102000009618 Transforming Growth Factors Human genes 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000010376 human cloning Methods 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000411 inducer Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- -1 isopropylthio Chemical group 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000002381 plasma Anatomy 0.000 description 2
- 239000013600 plasmid vector Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 108091008146 restriction endonucleases Proteins 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 238000001262 western blot Methods 0.000 description 2
- QCVGEOXPDFCNHA-UHFFFAOYSA-N 5,5-dimethyl-2,4-dioxo-1,3-oxazolidine-3-carboxamide Chemical compound CC1(C)OC(=O)N(C(N)=O)C1=O QCVGEOXPDFCNHA-UHFFFAOYSA-N 0.000 description 1
- 102000039968 CEA family Human genes 0.000 description 1
- 108091069214 CEA family Proteins 0.000 description 1
- 108091006146 Channels Proteins 0.000 description 1
- 206010009944 Colon cancer Diseases 0.000 description 1
- 208000001333 Colorectal Neoplasms Diseases 0.000 description 1
- 102000012410 DNA Ligases Human genes 0.000 description 1
- 108010061982 DNA Ligases Proteins 0.000 description 1
- 238000000018 DNA microarray Methods 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 102000003886 Glycoproteins Human genes 0.000 description 1
- 108090000288 Glycoproteins Proteins 0.000 description 1
- 101000914324 Homo sapiens Carcinoembryonic antigen-related cell adhesion molecule 5 Proteins 0.000 description 1
- 101000914321 Homo sapiens Carcinoembryonic antigen-related cell adhesion molecule 7 Proteins 0.000 description 1
- 101000617708 Homo sapiens Pregnancy-specific beta-1-glycoprotein 1 Proteins 0.000 description 1
- 101000617707 Homo sapiens Pregnancy-specific beta-1-glycoprotein 11 Proteins 0.000 description 1
- 102000016844 Immunoglobulin-like domains Human genes 0.000 description 1
- 108050006430 Immunoglobulin-like domains Proteins 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 241000283973 Oryctolagus cuniculus Species 0.000 description 1
- 238000012408 PCR amplification Methods 0.000 description 1
- 101150062375 PSG9 gene Proteins 0.000 description 1
- 102100022019 Pregnancy-specific beta-1-glycoprotein 2 Human genes 0.000 description 1
- 108020005038 Terminator Codon Proteins 0.000 description 1
- 108010073929 Vascular Endothelial Growth Factor A Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 239000011543 agarose gel Substances 0.000 description 1
- 125000003275 alpha amino acid group Chemical group 0.000 description 1
- 235000001014 amino acid Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000033115 angiogenesis Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 101150039352 can gene Proteins 0.000 description 1
- 235000013877 carbamide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 206010009887 colitis Diseases 0.000 description 1
- 201000010989 colorectal carcinoma Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000003398 denaturant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000014103 egg white Nutrition 0.000 description 1
- 210000000969 egg white Anatomy 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 108020001507 fusion proteins Proteins 0.000 description 1
- 102000037865 fusion proteins Human genes 0.000 description 1
- 238000010353 genetic engineering Methods 0.000 description 1
- 230000013595 glycosylation Effects 0.000 description 1
- 238000006206 glycosylation reaction Methods 0.000 description 1
- 239000003102 growth factor Substances 0.000 description 1
- 230000001900 immune effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 108020004999 messenger RNA Proteins 0.000 description 1
- 238000003752 polymerase chain reaction Methods 0.000 description 1
- 238000000247 postprecipitation Methods 0.000 description 1
- 108010000627 pregnancy-specific beta-1-glycoprotein 7 Proteins 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000006920 protein precipitation Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000004881 tumor cell Anatomy 0.000 description 1
- 230000005748 tumor development Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
- C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
- C07K14/4715—Pregnancy proteins, e.g. placenta proteins, alpha-feto-protein, pregnancy specific beta glycoprotein
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Zoology (AREA)
- Gastroenterology & Hepatology (AREA)
- Gynecology & Obstetrics (AREA)
- Biochemistry (AREA)
- Toxicology (AREA)
- Reproductive Health (AREA)
- Biophysics (AREA)
- Medicinal Chemistry (AREA)
- Molecular Biology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Pregnancy & Childbirth (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Peptides Or Proteins (AREA)
Abstract
本发明公开了一种制备人妊娠特异性糖蛋白9的方法。该方法包括如下步骤:(1)构建重组菌:将人PSG9蛋白的编码基因导入宿主大肠杆菌中,得到重组菌;(2)重组菌诱导培养:将重组菌用IPTG进行诱导培养,IPTG在菌液中的浓度为3uM,诱导培养的温度为30℃,得到诱导后菌体;(3)蛋白纯化:将诱导后菌体破碎,取上清;将上清用镍柱进行纯化,纯化过程中使用的洗脱液是含有40nM咪唑的洗脱缓冲液,收集洗脱液,即得到人PSG9蛋白。实验结果表明,本发明方法制备得到的人PSG9蛋白的纯度高,可达27.3mg/L,为后续PSG9在癌症中作用机制研究以及获得高纯度的单克隆抗体奠定了基础。
Description
技术领域
本发明涉及基因工程领域,具体为一种制备人妊娠特异性糖蛋白9的方法。
背景技术
妊娠特异性糖蛋白(Pregnancy specific glycoprotein,PSG)是一种糖基化蛋白,具有复杂的蛋白质三级结构,是癌胚抗原(Carcinoembryonic antigen,CEA)家族的成员。但是,目前对PSG家族研究较少。PSGs共包含11个成员,各成员间蛋白质序列保守性较强,同CEA家族蛋白一样,都含有免疫球蛋白样结构域(domain),且是该蛋白的主要结构域。通过研究也发现,PSG1可能参与胚胎期血管生成。另外,还发现PSG蛋白另一项重要的功能是可以通过转化生长因子(Transfer growth factor,TGF)-beta,参与免疫反应,且能够抑制结肠炎症的发生。
PSG9是PSG蛋白的一种异构体,该基因也称为PSG7或PSG11,在蛋白质序列的N-端含有血管内皮生长因子(Vascular endothelial growth factor,VEGF)样结构域。PSG9蛋白是制备抗PSG9单克隆抗体的必备材料,同时,也是后期建立检测人血液或组织中PSG9蛋白酶联免疫吸附试剂盒的标准品。Salahshor等通过基因芯片技术发现:PSG9在结直肠癌组织中高表达。对已经公布的表达谱芯片数据分析也发现,在肺癌中,PSG9 mRNA表达上调。多种肿瘤细胞系中也发现了PSG9蛋白的表达。PSG9是一种分泌型蛋白,在血浆中可以检测到。有研究报道在肝细胞癌中,PSG9血浆含量显著高于健康人群。据此,推测PSG9可能促进肿瘤发生发展。但是,对于PSG9在肿瘤发生中的作用仍不清楚。
目前,还未见有研究者表达全长的人PSG9蛋白,用于研究其功能。对于PSG9功能的挖掘很大程度受限于:没有一种稳定、特异性强的抗体,来分析PSG9在肿瘤组织的表达,构建酶联免疫吸附反应(ELISA)试剂盒,相互作用蛋白等。
发明内容
本发明的一个目的是提供一种制备人PSG9蛋白的方法。
本发明所提供的制备人PSG9蛋白的方法包括如下步骤:
(1)构建重组菌:将人PSG9蛋白的编码基因导入宿主大肠杆菌中,得到重组菌;
(2)重组菌诱导培养:将重组菌用IPTG进行诱导培养,IPTG在菌液中的浓度为3uM,诱导培养的温度为30℃,得到诱导后菌体;
(3)蛋白纯化:将诱导后菌体破碎,取上清;将上清用镍柱进行纯化,纯化过程中使用的洗脱液是含有40nM咪唑的洗脱缓冲液,收集洗脱液,即得到人PSG9蛋白。
上述所述人PSG9蛋白的氨基酸序列如SEQ ID NO.2中自N端起第1-426位氨基酸所示。
上述所述的宿主大肠杆菌为E.coli BL21(DE3)。
上述所述人PSG9蛋白的编码基因如SEQ ID NO.1中第1-1278位核苷酸的DNA分子所示。
上述所述将人PSG9蛋白的编码基因导入宿主大肠杆菌中的方法为:将所述人PSG9蛋白的编码基因插入载体pET-21α-His的多克隆位点,得到重组载体;再将重组载体导入所述宿主大肠杆菌中。
本发明的另一个目的是提供一种用于制备人PSG9蛋白的重组菌。
本发明所提供的制备人PSG9蛋白的重组菌的具体步骤:将人PSG9蛋白的编码基因导入宿主大肠杆菌中获得的。
上述所述的宿主大肠杆菌为E.coli BL21(DE3)。
上述所述人PSG9蛋白的编码基因如SEQ ID NO.1中第1-1278位核苷酸的DNA分子所示。
上述所述将人PSG9蛋白的编码基因导入宿主大肠杆菌中的方法为:将所述人PSG9蛋白的编码基因插入载体pET-21α-His的多克隆位点,得到重组载体;再将重组载体导入所述宿主大肠杆菌中。
实验结果表明,本发明方法制备得到的人PSG9蛋白的纯度高,可达27.3mg/L,为后续PSG9在癌症中作用机制研究以及获得高纯度的单克隆抗体奠定了基础。
附图说明
图1为PSG9基因克隆双酶切(NheI、HindIII)鉴定。共挑取4个单克隆;M为DNA分子量Marker(bp)。
图2为SDS-PAGE鉴定IPTG诱导E.coli BL21(DE3)-PSG9-6×His菌株PSG9蛋白的表达。A为经过不同IPTG浓度(1:0μM,2:0.5μM,3:1μM,4:2μM,5:3μM,6:5μM)诱导后,检测PSG9-6×His蛋白的表达量;B为不同温度(1:未加入IPTG诱导,2:20℃,3:25℃,4:30℃,5:37℃)条件下,IPTG诱导PSG9-6×His蛋白的表达量;M为蛋白质分子里Marker(kDa)。
图3为SDS-PAGE检测PSG9-6×His蛋白的可溶性表达和纯化。A为PSG9蛋白在破碎后沉淀和上清中的分布(1:沉淀,2:上清);B为PSG9蛋白的纯化,用不同浓度的咪唑进行洗脱(1:纯化前;咪唑浓度,2:20nM,3:40nM,4:100nM,5:200nM,6:1000nM);M为蛋白质分子量Marker(kDa)。
图4为Western-blot分析E.coli BL21(DE3)的表达。1为未用IPTG诱导;2为IPTG诱导后。
具体实施方式
下述实施例中所使用的实验方法如无特殊说明,均为常规方法。
下述实施例中所用的材料、试剂等,如无特殊说明,均可从商业途径得到。
实施例1、人PSG9基因工程菌株的构建
1、聚合酶链式反应克隆人PSG9的全长基因
采用上游和下游引物序列,以pcDNA3.1-PSG9质粒载体为模板克隆人全长的PSG9编码基因序列。引物序列如下:
上游引物序列:5’-CTAGCTAGCACAGGCAGCAGAGACCATGGG-3’,下划线代表Nhe I酶切位点;
下游引物序列:5’-CCAAGCTTTACAGTCTCAGAGTCAGTCATGA-3’,下划线代表Hind III酶切位点,同时将下游的终止密码子换为CAT。
也可人工合成SEQ ID NO.1中第1-1278位核苷酸所示基因,并在其上下游添加Nhe I酶切位点和Hind III酶切位点。
2、双酶切、连接
用NheI酶和HindIII酶对PCR扩增产物进行酶切,回收目的基因片段;将目的基因片段用T4 DNA连接酶连接到pET-21α-His质粒(购自Novagen公司,目录号为:69770-3)上,得到重组质粒,记作pET-21α-PSG9-His。对重组质粒进行测序验证,结果表明连入pET-21α-His的外源基因的序列如SEQ ID NO.1中第1-1278位核苷酸所示,表明载体构建正确。SEQ ID NO.1中第1-1278位核苷酸所示基因编码的蛋白如SEQID NO.2中自N端1-426氨基酸所示。
3、转化
将构建好的pET-21α-PSG9-His质粒载体按转化E.coli BL21(DE3),得到重组菌。将重组菌进行单克隆培养,挑取单克隆后,进行双酶切鉴定,结果如图1所示。表明构建的重组菌正确,将其记作E.coli BL21(DE3)-PSG9-6×His。该重组菌表达的蛋白是带有His标签的,即为SEQ ID NO.2所示融合蛋白(PSG9-6×His)。
实施例2、PSG9蛋白的表达及纯化
1、PSG9-6×His蛋白的表达条件的摸索
将E.coli BL21(DE3)-PSG9-6×His培养至菌液OD值为0.6时,用诱导剂异丙基硫代半乳糖苷(Isopropylβ-D-1-Thiogalactopyranoside,IPTG)诱导目的蛋白PSG9-6×His的表达。为获得高产量的PSG9-6×His蛋白,我们对IPTG的浓度及诱导温度进行了优化。
用不同浓度(0μM、0.5μM、1μM、2μM、3μM、5μM)的IPTG诱导目的蛋白PSG9-6×His的表达。结果表明,当IPTG的浓度为3μM时,目的蛋白的浓度达到最大值(图2A)。
在不同温度(20℃、25℃、30℃、37℃)下用IPTG诱导目的蛋白PSG9-6×His的表达,IPTG在菌液中的浓度为3μM。结果表明,在30℃的情况下,PSG9-6×His蛋白占总蛋白的含量最高(图2B)。
2、PSG9-6×His蛋白的表达
将E.coli BL21(DE3)-PSG9-6×His培养至菌液OD值为0.6时,用诱导剂异丙基硫代半乳糖苷(Isopropylβ-D-1-Thiogalactopyranoside,IPTG)诱导目的蛋白PSG9-6×His表达,IPTG在菌液中的浓度为3μM,温度为30℃,诱导培养时间为5h。
3、PSG9-6×His蛋白的纯化
将诱导表达后菌体破碎,分别取沉淀和上清。用含有强变性剂6M尿素的溶液溶解破碎诱导表达后细菌中不溶解的沉淀,并用SDS-PAGE电泳检测目的蛋白在沉淀和上清中的分布(图3A)。结果表明,PSG9-6×His蛋白主要包含于上清中,分子量约为50 KDa。
用全是金公司的ProteinIsoTM Ni-IDA琼脂糖凝胶柱进行纯化。将上清上柱后分别用含有20nM、40nM、100nM、200nM、1000nM咪唑的洗脱缓冲液进行洗脱,并用10%的SDS-PAGE进行检测。结果表明,用含有40nM咪唑的洗脱缓冲液洗脱时,大部分的PSG9-6×His蛋白被洗脱下来,如图3B所示,收集40nM咪唑的洗脱产物。
对洗脱获得的PSG9-6×His蛋白的纯度和产率进行检测。结果表明:洗脱产物中蛋白的浓度为910ug/ml,蛋白的产率为27.3mg/L(每100ml菌液可得目的蛋白2.73mg)。
4、鉴定
我们采用Western blot对表达的PSG9-6×His蛋白进行鉴定。用多克隆兔抗人抗体检测表达的蛋白,实验结果如图4所示,经IPTG诱导后表达的PSG9-6×His蛋白,可见明显条带,分子量同预期大小一致,结果表明我们所表达的蛋白为人PSG9蛋白。
Claims (2)
1.一种制备人PSG9蛋白的方法,包括如下步骤:
(1)构建重组菌:将人PSG9蛋白的编码基因导入宿主大肠杆菌中,得到重组菌;
(2)重组菌诱导培养:将重组菌用IPTG进行诱导培养,IPTG在菌液中的浓度为3μM,诱导培养的温度为30℃,得到诱导后菌体;
(3)蛋白纯化:将诱导后菌体破碎,取上清;将上清用镍柱进行纯化,纯化过程中使用的洗脱液是含有40nM咪唑的洗脱缓冲液,收集洗脱液,即得到人PSG9蛋白;
所述人PSG9蛋白的编码基因如SEQ ID NO.1中第1-1278位核苷酸的DNA分子所示。
2.根据权利要求1所述的方法,其特征在于:所述宿主大肠杆菌为E.coli BL21(DE3)。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410376676.0A CN104151407B (zh) | 2014-08-01 | 2014-08-01 | 一种制备人妊娠特异性糖蛋白9的方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410376676.0A CN104151407B (zh) | 2014-08-01 | 2014-08-01 | 一种制备人妊娠特异性糖蛋白9的方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN104151407A CN104151407A (zh) | 2014-11-19 |
CN104151407B true CN104151407B (zh) | 2016-11-23 |
Family
ID=51877059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201410376676.0A Expired - Fee Related CN104151407B (zh) | 2014-08-01 | 2014-08-01 | 一种制备人妊娠特异性糖蛋白9的方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN104151407B (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017113565A1 (zh) * | 2015-12-29 | 2017-07-06 | 中国医学科学院肿瘤医院 | 基于蛋白标志物psg3辅助诊断肝癌或消化道癌症患者的试剂盒 |
CN106932587B (zh) * | 2015-12-29 | 2018-07-27 | 中国医学科学院肿瘤医院 | 基于蛋白标志物psg3辅助诊断肝癌或消化道癌症患者的试剂盒 |
CN105505943B (zh) * | 2016-01-30 | 2019-01-04 | 中国医学科学院肿瘤医院 | 一种妊娠特异性糖蛋白3标准品、其制备方法以及用于制备的重组菌 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103290048B (zh) * | 2013-06-27 | 2015-07-15 | 天津科技大学 | 一种适用于芽孢杆菌属同源重组的质粒及工程菌 |
-
2014
- 2014-08-01 CN CN201410376676.0A patent/CN104151407B/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN104151407A (zh) | 2014-11-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Sommaruga et al. | Highly efficient production of anti-HER2 scFv antibody variant for targeting breast cancer cells | |
CN104151407B (zh) | 一种制备人妊娠特异性糖蛋白9的方法 | |
Hu et al. | Expression, purification of IL-38 in Escherichia coli and production of polyclonal antibodies | |
CN107603996A (zh) | 一种重组蛋白的编码序列、重组蛋白及其单克隆抗体的制备方法 | |
CN108642073A (zh) | 一种梨PbrRALF2蛋白质的体外表达及其多克隆抗体的制备方法 | |
CN104711265B (zh) | 一种绿盲蝽卵黄原蛋白、其特异性肽链、载体、菌株及应用 | |
CN104610443B (zh) | 一种高稳定性重组降钙素原、制备方法及用途 | |
Gull et al. | Heterologous expression, immunochemical and computational analysis of recombinant human interferon alpha 2b | |
Sarvestani et al. | An approach for recombinant epidermal growth factor purification using an elastin-like protein tag | |
CN108300725B (zh) | 可溶性单链抗体超抗原融合基因及蛋白和其制备与应用 | |
CN110872354B (zh) | 哺乳动物细胞重组抗人tk1的鸡源的单克隆抗体、单链抗体及其制备方法和应用 | |
MA | High expression level of human epidermal growth factor (hEGF) using a well-designed fusion protein-tagged construct in E. coli. | |
Hanif et al. | Heterologous secretory expression and characterization of dimerized bone morphogenetic protein 2 in Bacillus subtilis | |
Nguyen et al. | Efficient production of human interleukin‐3 from Escherichia coli using protein disulfide isomerase b'a'domain | |
CN111763255B (zh) | 一种经基因修饰的vegfa蛋白及其单克隆抗体与应用 | |
CN108218996A (zh) | 重组蛋白及其纯化制备方法 | |
CN114057861A (zh) | 一种靶向UBE2C的bio-PROTAC人工蛋白 | |
CN108165539A (zh) | 一种梨S7-RNase蛋白的体外表达方法及其多克隆抗体的制备方法 | |
CN106929512A (zh) | St2抗原的制备及其专用编码dna分子 | |
CN106913864A (zh) | 融合蛋白tat‑dcf1的新用途 | |
Iranpoor et al. | Expression of recombinant human insulin-like growth factor type 1 (rhIGF-1) in Escherichia coli | |
Wang et al. | Polyclonal antibody production against rGPC3 and their application in diagnosis of hepatocellular carcinoma | |
CN105237637B (zh) | 抗人神经纤毛蛋白1的单域抗体及其制备方法 | |
CN116178538B (zh) | 靶向热休克蛋白70的纳米抗体及其制备方法与应用 | |
CN105669837B (zh) | 血管内皮钙黏蛋白抗原表位、抗体及其应用 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20200801 |
|
CF01 | Termination of patent right due to non-payment of annual fee |