带有TAT-PTD跨膜转导域融合基因的原核表达及表达条件优化

为构建pGEX-TAT-GFP原核表达质粒并优化GST-TAT-GFP表达条件,将PCR扩增的基因TAT-GFP克隆至质粒pGEX-2T,转化大肠杆菌BL21,IPTG诱导表达并优化表达条件,表达产物进行SDS-PAGE、Western blot及荧光学特性鉴定.结果表明:构建的质粒经PCR、酶切和DNA测序正确,含有重组质粒的宿主菌经过IPTG诱导表达分子量约为54.3 kD的融合蛋白GST-TAT-GFP,并经优化确定最佳的诱导表达条件.     

GST-Jab1融合蛋白表达载体的构建及表达纯化

目的获取GST-Jab1蛋白,进一步研究Jab1的功能。方法以pMSCVneo-Jab1为模板,PCR扩增Jab1 DNA片断,EcoRI和XhoI双酶切后克隆至pGEX-5X-1表达载体,测序验证。将正确重组的pGEX-5X-1-Jab1表达质粒转化E.coli BL21,IPTG诱导后,超声破碎细胞,用GST琼脂糖珠对上述表达产物进行纯化,SDS-PAGE、Western Blot分析和鉴定诱导表达和纯化的GST-Jab1蛋白质。结果成功构建了pGEX-5X-1-Jab1重组表达载体,SDS-PAGE分析结果显示表达和纯化的蛋白质与融合蛋白GST-Jab1预期分子量一致,Western Blot鉴定结果证实纯化的蛋白质为GST-Jab1。结论成功地表达、纯化了GST-Jab1融合蛋白。     

重组蛋白Fpr3的原核表达、纯化与多克隆抗体的制备

为了从分子水平上进一步研究PPIase与PP1的相互作用,将构建好的pGEX-5X-1重组表达质粒转化于受体菌BL21(DE3)感受态细胞中,用IPTG诱导后得到了可溶形式表达的融合蛋白.采用GST亲和层析法对重组蛋白进行了纯化,并用Factor Xa对融合蛋白进行柱上酶切,SDSPAGE检测表明可获得较高纯度的GST-Fpr3融合蛋白以及去除GST标签的目的蛋白.用其免疫日本雄性大耳白兔,成功制备了抗GST-Fpr3的多克隆抗体,为Fpr3的空间结构的解析和相应的分子识别过程奠定了基础.     

GST-SDF-1α融合蛋白的原核表达及纯化

构建融合重组表达载体并对其进行诱导表达蛋白以获得大量重组融合蛋白。通过PCR方法扩增出小鼠SDF-1α基因,克隆入pMD18T载体中,进行测序分析。将该基因亚克隆入原核表达载体pGEX-4T11中GST的下游构建重组质粒pGEX-4T1-SDF-1α,转化受态细胞BL21中,经IPTG诱导表达重组融合蛋白,对表达产物进行SDS-PAGE电泳检测分析。在约Mr36×103处出现一新生的蛋白条带。经灰度扫描检测,表达量约占菌体总蛋白的30%,纯化后得到了目的蛋白。成功克隆了小鼠的SDF-1α基因,并纯化融合基因GST-SDF-1α的原核表达产物。     

GST-UCP2-N和GST-UCP2-C原核表达载体的构建表达及多克隆抗体的制备

以pMD18-T-hucp2为模板,用设计的两对特异性的引物PCR得到hucp2cDNA N端和C端的两断基因片段,然后将其插入到pGEX-5X-1表达载体上,重组质粒在PCR、双酶切、测序鉴定后,经IPTG诱导,在大肠杆菌BL21表达大量融合蛋白GST-UCP2-N(C),经GST亲和层析纯化蛋白.以该蛋白为抗原免疫ucp2基因敲除小鼠,western blot鉴定血清中抗体的反应性.实验证明成功构建了构建pGEX-5X-1-UCP-N(C)重组质粒,表达出了融合蛋白.并获得了抗血清.为进一步获得灵敏性更高,特异性更强的UCP2的抗体打下了基础.     

酿酒酵母金属硫蛋白的表达、纯化及活性检测

通过PCR从酿酒酵母基因组DNA上扩增得到酿酒酵母基因CUP1编码的金属硫蛋白序列.将其编码序列克隆到质粒pTWIN1构建重组表达质粒pTWIN1-MT,转化大肠杆菌感受态细胞ER2566.重组融合蛋白CBD-intein1-MT在IPTG的诱导下得到表达,经SDS-PAGE和蛋白质印迹鉴定.用重组菌分别进行铜离子耐受...     

GST—hBTLyS融合蛋白基因的构建及其在大肠杆菌中的表达

根据hBTLyS（human Blymphocte stimulator）基因序列设计合成特异性引物。用RT－PCR从人外周血淋巴细胞扩增出858bp的hBLyS基因，并将其插入到融合蛋白原核表达载体pGEX-4T-1中，得到重组表达质粒pGEX-4T-1/hBLyS.把此重组质粒转化大肠杆菌BL21，经用IPTG诱导，表达出GST－hBLyS融合蛋白。     

小鼠Pem-GST融合蛋白在大肠杆菌中的表达

目的：为制备重组小鼠Pem（以下简称mPem）-谷胱甘肽巯基转移酶（GST）融合蛋白，作为研究mPem蛋白功能的材料，方法：根据携带小鼠Pem基因编码序列的模板质粒pEGFP/mPem设计合成特异性引物，PCR扩增小鼠Pem基因编码序列，并插入融合蛋白原核表达载体pGEX-4T-3中，得到重组表达质粒pGEX-4T-3/mPem，用此重组质粒转化大肠杆菌BL21细胞，IPTG诱导重组菌表达mPem蛋白，SDS-PAGE及Western Blot鉴定表达产物。结果：重组菌株明显诱导表达出预期相对分子质量49000的融合蛋白。结论：成功构建了mPem-GST原核表达质粒，并在大肠杆菌中表达出mPem-GST融合蛋白，为mPem蛋白功能的研究打下了基础。     

简化的人纤溶酶原饼环区5基因的克隆及其在大肠杆菌中的融合表达

从正常人肝脏组织中提取总RNA,合理设计引物,利用RT-PCR直接得到简化的hPK-5基因.将该基因克隆至原核表达质粒pGEX-1λT,将此重组载体转化大肠杆菌JM109,经PCR、酶切及测序鉴定阳性克隆.用IPTG诱导阳性克隆表达融和蛋白,SDS-PAGE观察表达产物.再通过Western-Blotting鉴定.简化的hPK-5基因的RT-PCR产物为264bp.通过酶切、测序等方法鉴定简化的hPK-5基因正确克隆至原核表达质粒pGEX-1λT中.重组质粒pGEX-1λT/predhPK-5在大肠杆菌中     

羊布鲁菌外膜蛋白Omp25d的原核表达、鉴定及纯化

研究羊布鲁菌外膜蛋白Omp25d基因的克隆,原核表达,以及纯化,根据羊布鲁菌M5株外膜蛋白Omp25d蛋白基因序列设计引物,扩增出大小约为650bp的目的基因片断,克隆入融合表达载体pGEX-4T-1,构建重组质粒pGEX-4T-1-Omp25d。在大肠杆菌中将该蛋白表达并用亲和层析法纯化。用Western-blot分析方法鉴定GST-Omp25d蛋白。结果成功地构建了pGEX-4T-1-Omp25d原核表达载体并在大肠杆菌中表达了Omp25d基因,纯化后所获得的融合蛋白与兔抗布鲁菌血清发生特异性反应。表明研究成功构建了pGEX-4T-1-Omp25d元和表达载体,并且在大肠杆菌中进行表达,纯化的融合蛋白具有良好的免疫原性。     

转录因子E2F—1的DNA结合结构域与GST的融合表达和纯化

通过聚合酶链式反应方法扩增转录因子Ｅ２Ｆ－１中ＤＮＡ结合结构域的基因片段,并将其克隆到ｐＧＥＸ－２Ｔ表达载体中,转化ＢＬ２１菌株．经ＩＰＴＧ诱导,目的蛋白在大肠杆菌中得到高效表达,其表达量达１５％．经ＧＳＴ－Ａｇａｒｏｓｅ亲合层析,目的蛋白得到了高度纯化．经胶迁移率改变实验（ｇｅｌｓｈｉｆｔｍｏｂｉｌｉｔｙａｓａｙ）证明目的蛋白具有与腺病毒Ｅ２启动子ＤＮＡ片段结合的能力．     

Cloning, sequencing and expression of the coat protein gene of Cocksfoot mottle virus

The coat protein (CP) gene of Cocksfoot mottle virus (CfMV) was amplified by RT-PCR and inserted into expression vector pGEX-4T-1, and the resulting plasmid was designated as pGEXCfMV-JANCP. The fusion protein GST-CP was expressed in BL21 (DE3) pLysS after IPTG induction. The results of SDS-PAGE and Western blot analysis showed that the CfMV-CP gene was efficiently expressed in E. coli BL21 (DE3) pLysS through IPTG induction and the 56.0 kD protein was obtained.     

Cloning, sequencing and expression of the coat protein gene of Cocksfoot mottle virus

The coat protein (CP) gene of Cocksfoot mottle virus (CfMV) was amplified by RT-PCR and inserted into expression vector pGEX-4T-1, and the resulting plasmid was designated as pGEXCfMV-JANCP. The fusion protein GST-CP was expressed in BL21 (DE3) pLysS after IPTG induction. The results of SDS-PAGE and Western blot analysis showed that the CfMV-CP gene was efficiently expressed in E.coli BL21 (DE3) pLysS through IPTG induction and the 56.0 kD protein was obtained.     

BIG-3的原核表达、纯化及其多克隆抗体的制备与鉴定

原核表达、纯化骨形态发生蛋白诱导基因（BIG-3,BMP-2-induced gene 3kb）所编码的融合蛋白并制备其多克隆抗体。将BIG-3基因插入原核表达载体PGEX-4T-2的多克隆位点获得pGEX-4T-2-BIG-3重组表达载体,转化大肠杆菌BL21（DE3）菌株,诱导表达,SDS-PAGE鉴定融合蛋白表达情况及Sepharose4B层析柱亲和层析法纯化的融合蛋白;用纯化的融合蛋白免疫新西兰大白兔制备其多克隆抗体,并以Western blot鉴定其特异性。结果在大肠杆菌中获得BIG-3-GST融合蛋白高水平的诱导表达,经Sepharose4B层析柱亲和层析,GST-BIG-3融合蛋白在电泳图片上显示较为清晰的单一条带,所制备的多克隆抗体具有较高的特异性。说明在大肠杆菌中成功表达且以亲和层析法纯化得到了BIG-3-GST融合蛋白,并制备了特异性较高的多克隆抗体。     

SARS冠状病毒N蛋白的表达及二级结构预测分析

通过RT-PCR获得SARS冠状病毒N蛋白基因，分别克隆到原核表达载体pET21a，pET32a和pGEX-4T-1中，将3种重组质粒pET2la-N，pET32a-N和pGEX-4T-1-N分别转化大肠杆菌BL21(DE3)，经IPTG诱导，细菌中分别表达出约46kD的重组N蛋白、约60kD的6xHis-N融合蛋白和约70kD的GST-N融合蛋白，表达量分别达总蛋白的45％、40％和30％．进一步的分析表明：6xHis-N融合蛋白在大肠杆菌中为可溶性表达，该可溶性组分占细菌裂解液的70％左右，且能被6xHis抗体所识别．用蛋白分析软件对N蛋白进行了序列分析和二级结构预测．SARS冠状病毒N蛋白在大肠杆菌中的高效可溶性表达，有助于进一步结晶后进行X射线晶体衍射分析其结构与功能．     

大鼠肌肉素cDNA克隆及表达

通过RT-PCR方法从大鼠骨骼肌中克隆到肌肉素cDNA,构建表达载体pGEX-5X-3-musclin,并在BL21大肠杆菌中成功表达了融合蛋白GST-Musclin,且对表达条件进行了优化.在最优化的表达条件下,融合蛋白的表达量达到了14.2%.     

Cloning and expression of the vp39 gene ofBombyx mori nuclear polyhedrosis virus inE. coli

The nuclear capsid protein gene (vp39) ofBombyx mori nuclear polyhedrosis virus (BmNPV) was amplified successfully by PCR technique and inserted into pGEM 3zf(+). The 5′ and 3′ terminal area of the amplified vp39 gene were sequenced with silver-staining dideoxy method. Bmvp39 gene was sub-cloned into the expression vector pRSET-A, and transformed intoE. coli BL21. This gene was highly expressed by IPTG induction. SDS-PAGE analysis showed that the expressed protein is about 38 kd, and the expressed amount reached maxium in 4 h with IPTG induction. Supported by the National Natural science Foundation of China and the Doctoral Foundation of Edn carto Committee Liu Deli: born in 1954, Doctoral Candidate from Huazhong Normal University To whom correspondence should be addressed: (027-7882712-2938)     

Cloning and expression of the vp39 gene of Bombyx mori nuclear polyhedrosis virus in E. coli

The nuclear capsid protein gene (vp39) ofBombyx mori nuclear polyhedrosis virus (BmNPV) was amplified successfully by PCR technique and inserted into pGEM 3zf(+). The 5′ and 3′ terminal area of the amplified vp39 gene were sequenced with silver-staining dideoxy method. Bmvp39 gene was sub-cloned into the expression vector pRSET-A, and transformed intoE. coli BL21. This gene was highly expressed by IPTG induction. SDS-PAGE analysis showed that the expressed protein is about 38 kd, and the expressed amount reached maxium in 4 h with IPTG induction. Supported by the National Natural science Foundation of China and the Doctoral Foundation of Edn carto Committee Liu Deli: born in 1954, Doctoral Candidate from Huazhong Normal University To whom correspondence should be addressed: (027-7882712-2938)     

Expression of human β-subunit nerve growth factor (hNGFB) in yeast Pichia pastoris and E. coli

The gene hNGFB encoding the β subunit of human nerve growth factor (hNGF) was cloned intoP. pastoris secretive expression vector pHIL-S1 andE. coli expression vector pET-15b. The recombinant hNGFB vectors pSNGF and pET15b-NGF were transformed intoP. pastoris host cell GS115 (Mut⁺, His⁻) andE. coli strain BL21 (DE3) respectively. Expression and secretion of hNGFB inP. pastoris was attempted under the direction of the AOX1 promoter and PHO1 signal sequence. The positive colonies growing on medium without histidine were further selected by PCR. The yield of rehNGFB in GS115 was about 14.4% of total cellular secretive protein. The secreted protein was immunological active on Western blotting with rabbit anti-mNGFB antibodies. The fusion protein yield of rehNGFB inE. coli BL21 (DE3) was about 10.3% of total cellular protein after IPTG induction. Western blot detection showed its immunological activity.     

淋巴囊肿病病毒主要衣壳蛋白1.3 kb基因片段的原核表达

取淋巴囊肿病病毒感染牙鲆组织,蛋白酶K裂解,PCR法成功获得了淋巴囊肿病病毒主要衣壳蛋白1.3 kb基因片段.构建其原核表达载体,IPTG诱导表达.结果表明,该融合蛋白分子量约70 kD,可与抗LCDV多克隆血清特异反应.为LCDV基因工程疫苗的研制奠定了实验基础.