乙型肝炎病毒前-S1蛋白反式激活基因5的筛选克隆与重组蛋白诱导表达

目的 克隆人类乙型肝炎病毒(HBV)前-S1蛋白(pre-S1)反式激活新型靶基因PS1TP5.构建其原核表达载体,并诱导其在大肠埃希菌中表达.方法 以HBV前-S1表达质粒pcDNA3.1(-)-preS1转染HepG2细胞,空载体pcDNA3.1(-)作为平行对照,提取mRNA进行抑制性消减杂交(suppression subtractive hybridization, SSH)技术分析,结合生物信息学(bioinformatics)技术筛选得到人类新基因PS1TP5.应用逆转录聚合酶链反应(RT-PCR)技术,以提取的HepG2细胞mRNA为模板,扩增获得PS1TP5基因片段,选用pGEM-T载体进行TA克隆,通过PCR、限制性酶切分析及测序进行鉴定,再将其亚克隆到原核表达载体pET-32a( )中,转化进BL21(DE3)宿主菌,经IPTG诱导获得了PS1TP5重组蛋白的表达,表达产物进行十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDSPAGE)分析,考马斯亮蓝染色,以抗-His的单克隆抗体进行Western blotting免疫印迹分析证实表达蛋白的特异性.结果 成功扩增出PS1TP5基因.并将其插入pET-32a( )原核表达载体,经BL21(DE3)受体菌转化、IPTG诱导、SDS-PAGE分析获得了PS1TP5重组蛋白的表达,Western blotting证实了重组蛋白表达的特异性.结论 应用SSH、RT-PCR与生物信息学技术筛选克隆出PS1TP5基因,构建了pET-32a( )-PS1TP5原核表达载体,并利用大肠埃希菌原核表达系统成功获得了pET-32a( )-PS1TP5重组蛋白的表达.为进一步研究PS1TP5免疫原性及慢性乙型肝炎发病机制创造了条件.     

乙型肝炎病毒前S1蛋白反式激活蛋白2结合蛋白1基因的克隆及其反式调节基因的筛选

目的 克隆HBV前S1蛋白反式激活蛋白2结合蛋白1(PS1TP2BP1)基因,并筛选与其相互作用的反式激活基因.方法 应用聚合酶链反应(PCR)扩增PS1TP2BP1基因,鉴定正确后再将其亚克隆到真核表达载体pcDNATM3.1/myc-His A上;以真核表达质粒pcDNATM3.1/mycHis A-PS1TP2BP1转染HepG2细胞,构建cDNA消减文库;进行测序及同源性分析.结果 从HepG2细胞来源的cDNA中扩增出PS1TP2BP1基因,并成功进行TA克隆,酶切、测序均正确后,成功构建真核表达重组体.消减文库扩增后得到35个阳性克隆,经菌落PCR分析,得到15个含200～1000 bp插入片段的菌落.对所得片段测序,并进行间源性分析,显示15种已知基因编码蛋白可能是PS1TP2BP1反式激活靶基因.结论 成功克隆PS1TP2BP1,并构建了PS1TP2BP1反式激活基因差异表达的cDNA消减文库,为今后进一步分析、研究病毒蛋白的致病机制奠定了基础.     

乙型肝炎病毒全S蛋白与纤维蛋白原α链的相互作用

目的:筛选人肝细胞cDNA文库中与乙型肝炎病毒(HBV)全S蛋白相互作用蛋白的基因,并反向验证HBV全S蛋白候选结合蛋白之间相互作用.方法:将全S基因定向克隆到酵母表达栽体pDEST 32,构建正向筛选的诱饵质粒并Western b1ot法验证其在酵母中的表达.将诱饵质粒与人肝细胞cDNA文库质粒共同转化MaV203酵母细胞,在人肝细胞cDNA文库筛选候选结合蛋白,提取阳性茵落质粒测序.并分析其生物学性质.将筛选出的纤维蛋白原α链中下游序列及不同全S变异株基因,分别定向克隆到pDEST32及pDEST22载体中,利用Western blot法验证表达.将诱饵质粒与猎物质粒共同转化MaV203酵母细胞,以反向酵母双杂交方法验证初筛结果的可靠性及正确性.结果:正向的酵母双杂交实验,经初筛和再转染实验纤维蛋白原α链可与HBV全S蛋白发生相互作用.再以纤维蛋白原α链为靶基因设计诱饵质粒,以四种变异的HBV全S蛋白为靶基因设计猎物质粒,反向酵母双杂交法证实维蛋白原α链中下游可与不同全S变异体(总差异率2%)发生相互作用,纤维蛋白原α链与全S蛋白的结合域可能为病毒蛋白的前268aa.结论:纤维蛋白原β链中下游可与HBV全S蛋白产生特异性结合,其结合域可能与病毒蛋白的前268aa产生相互作用.     

应用抑制性消减杂交技术克隆和筛选PS1TP5反式激活相关基因

目的构建乙型肝炎病毒前-S1蛋白反式激活基因5(PS1TP5)的反式激活相关基因差异表达的cDNA,克隆PS1TP5蛋白反式激活相关基因。方法以PS1TP5表达质粒pcDNA3.1(-)-myc-his(A)-PS1TP5转染HepG2细胞,以空载体pcDNA3.1(-)-myc-his(A)为对照,制备转染后的细胞裂解液,提取mRNA并合成cDNA,经RsaⅠ酶切后将实验组cDNA分成两组,分别衔接两种不同接头,再与对照组cDNA进行两次消减杂交及两次PCR反应,产物与T/A克隆载体连接,构建cDNA消减文库,并转染大肠杆菌进行文库扩增,随机挑选克隆经PCR鉴定后进行测序及同源性分析。结果成功构建人PS1TP5蛋白反式激活相关基因差异表达的cDNA。扩增后得到70个200～1 000 bp插入片段的克隆,随机挑选其中30个插入片段测序,并通过生物信息学分析获得其全长基因序列,结果共获得24种编码基因,其中1个为未知功能的新基因,电子拼接后命名为HBV PS1TP5TP1(乙型肝炎病毒前-S1蛋白反式激活蛋白5反式激活蛋白1),GenBank注册号DQ487761。结论筛选到的cDNA全长序列,包括一些与细胞...     

酵母双杂交法对HBV表面抗原主蛋白候选结合蛋白的筛选

目的:自肝细胞cDNA文库中筛选与HBV主蛋白(SHBs)相互作用的蛋白基因,探讨主蛋白的生物学功能.方法:利用PCR扩增S主蛋白基因,定向克隆技术将靶基因克隆到pDEST32构建出S主蛋白的诱饵质粒:Western blot方法验证转化诱饵质粒的酵母细胞表达SHBs:将诱饵质粒与人肝cDNA文库猎物质粒共同转化MaV203酵母细胞,在营养缺陷型培养基和X-gal上进行三重筛选阳性菌落,提取阳性酵母茵落的猎物质粒进行DNA测序;利用核苷酸数据库及生物信息学技术,对于筛选结果进行分析.结果:构建S主蛋白及肝文库酵母细胞表达载体,进行酵母双杂交系统筛选人肝细胞cDNA文库,筛选出既能在缺陷培养基也能在X-gal的检测下变成蓝色的真阳性菌落3个,分别为核糖体蛋白L3、微管蛋白α-1a和α-2巨球蛋白.结论:用酵母双杂交技术筛选出3个与SHBs相互作用的肝细胞结合蛋白编码基因,提示SHBs可能参与到肝细胞内部的多种生物学反应.     

肝细胞cDNA文库中乙型肝炎病毒前-前-S蛋白结合蛋白基因筛选

目的:筛选并克隆人肝细胞cDNA文库中与乙型肝炎病毒(HBV)前-前-S蛋白相互作用蛋白的基因,探讨前-前- S在HBV致病中的作用. 方法:构建前-前-S的酵母细胞表达载体,采用酵母双杂交系统筛选人肝细胞cDNA文库,利用核苷酸数据库及生物信息学技术,对于筛选结果进行分析. 结果:获得了54个与前-前-S蛋白特异性结合的阳性克隆,其中包括30种已知蛋白基因和8个未知功能基因. 结论:克隆出与乙型肝炎病毒前-前-S蛋白结合的肝细胞蛋白基因,为进一步研究前-前-S在HBV致病中的作用奠定了基础.     

酵母双杂交体系筛选乙型肝炎病毒前S1蛋白相关蛋白

目的 利用酵母双杂交体系筛选乙型肝炎病毒前S1(PreS1)蛋白相关蛋白,进一步探讨PreS1在乙型肝炎病毒(HBV)人胞中的作用机制。方法 以HBV DNA阳性血清为模板扩增含EcoRⅠ与PstⅠ酶切位点的PreS1基因序列,pAS2—1载体及PreS1基因PCR产物经双酶切并连接,对饵载体pAS2—1—PreS1进行序列测定;将pAS2—1—PreS1转化入酵母菌AH109,以western blot法证实其在酵母细胞中的表达。将pAS2—1—PreS1及正常成人肝细胞cDNA文库共转化酵母细胞,通过选择性培养、LacZ活性测定筛选阳性菌落,分离实验及交合实验排除假阳性,扩增阳性克隆的目的基因并进行序列测定,结果提交BLAST程序,在GenBank数据库查询其同源序列。结果 饵载体pAS2—1—PreS1经序列测定含有完整的PreS1基因片段,western blot证实转化的酵母细胞能正确表达完整的PreS1—BD融合蛋白。pAS2—1—PreS1与正常成人肝细胞cDNA文库共转化酵母细胞后,选择性培养共长出97个菌落,筛选出1个阳性克隆,其PCR扩增产物经GenBank数据库查询与人类初期多肽相关复合体α亚单位(NACA)高度同源。结论 成功构建了pAS2-1-PreS1饵载体,并通过酵母双杂交体系筛选出肝细胞内与PreS1相互作用的蛋白NACA。     

乙型肝炎病毒前-X融合蛋白结合蛋白的筛选

目的利用酵母双杂交技术自肝细胞cDNA文库中筛选HBV前-X(pre-X)融合蛋白结合蛋白,探讨pre-X融合蛋白的生物学功能。方法 PCR扩增HBV pre-X基因序列,根据酵母双杂合体系构建诱饵质粒pDEST32-pre-X,并测定DNA序列验证。将质粒pDEST32-pre-X转化为酵母细胞MaV203,应用Western blot验证pre-X融合蛋白在酵母细胞中正确表达,再与转化为人肝细胞cDNA文库质粒的酵母细胞pDEST22配合,在营养缺陷型培养基和X-gal上三重筛选阳性菌落,提取阳性酵母菌落的猎物质粒进行DNA测序。利用核苷酸数据库及生物信息学技术,对筛选结果进行分析。结果成功构建pDEST32-pre-X诱饵质粒,Western blot证实转化诱饵质粒的酵母细胞能正确表达pre-X融合蛋白,pDEST32-pre-X及正常成人肝细胞cDNA文库共转化酵母细胞后,选择性培养出45个菌落,经缺陷培养基分离及X-gal检测后筛选出3个阳性克隆,测序结果为一种蛋白,即TCP1蛋白。结论用酵母双杂交技术筛选出1个与pre-X融合蛋白相互作用的肝细胞结合蛋白,为进一步研究HBV pre-X融合蛋白的作用提供了新线索。     

三叶因子2相互作用蛋白基因在胃癌细胞cDNA文库中的筛选

目的:筛选并克隆人胃癌细胞eDNA文库中与三叶因子2(trefoil factor family 2,TFF2)蛋白相互作用的蛋白基因.方法:RT-PCR方法验证胃癌细胞存在TFF2mRNA表达:PCR法扩增TFF2基因,Not I与Sal I双酶切后定向克隆到酵母表达载体pDEST32,构建TFF2的诱饵质粒;Western blot验证TFF2诱饵质粒在酵母细胞中相应融合蛋白的表达:将诱饵质粒和人胃癌-cDNA文库猎物质粒共同转化MaV203酵母感受态细胞,通过营养缺陷型培养基(ura、His)与x-gal进行3重筛选阳性克隆,提取阳性克隆质粒测序,应用蛋白质数据库及生物信息学技术,对测序结果进行分析.结果:RT-PCR法证实胃癌细胞中存在TFF2mRNA表达;构建pDEST32-TFF2诱饵表达质粒成功:Western blot法证实诱饵质粒转化酵母细胞后正确表达TFF2-GAL4DBD融合蛋白:通过酵母双杂交筛选胃癌细胞cDNA文库,共获得35个表达His、Ura及x-gal报告基因的阳性克隆,其中测序成功为16个克隆,包含12个已知蛋白基因与4个未知功能基因.结论:从胃癌细胞cDNA文库中筛选出多种TFF2相互作用蛋白基因,其可能与胃癌的发生发展密切相关.     

乙型肝炎病毒前S1蛋白反式激活基因5在酵母细胞中的表达

目的：在真核生物酵母细胞中表达乙型肝炎病毒前S1蛋白反式激活基因5（PS1TP5）。方法：以HepG2细胞来源的mRNA为模板，经RT-PCR法扩增PS1TP5基因，克隆到pGEM-T载体中，并测序鉴定，酶切回收后连接到酵母表达质粒pGBKT7中，并转化酵母AH109，色氨酸缺陷型培养基（SD／-Trp）上筛选阳性菌落，提取酵母蛋白质，进行十二烷基硫酸钠-聚丙烯酰胺凝胶电泳（SDS—PAGE）和Western免疫印迹分析，以明确PS1TP5是否可在其中表达。结果：成功扩增出PS1TP5，测序鉴定符合基因库报告序列，酶切回收的PS1TP5基因片段成功克隆人酵母表达载体pGBKT7，并转化人酵母细胞AH109中，Western免疫印迹显示该基因在酵母细胞中成功表达，表达产物相对分子质量为36950。结论：成功构建了PS1TP5酵母表达载体，并在酵母细胞中表达。     

酵母双杂交筛选肝细胞中乙型肝炎病毒表面抗原中蛋白结合蛋白基因

目的筛选并克隆人肝细胞中与HBsAg中蛋白(MHBs)相互作用肝细胞蛋白的基因,探讨MHBs的生物学功能。方法应用PCR法以HBV adr亚型全序质粒A7为模板扩增MHBs基因,克隆到pGEM-T载体中扩增并测序鉴定,EcoR I和BamH I双酶切后回收连接到酵母表达载体pGBWT- 7中并应用酵母双杂交系统3,构建MHBs诱饵质粒并转化酵母AH109,与转化了人肝cDNA文库质粒pACT2的酵母细胞Y187进行配合,在营养缺陷型培养基和X-α-半乳糖苷酸上进行双重筛选阳性菌落,提取阳性酵母菌落的质粒转化大肠杆菌氨苄青霉素-LB平板上,选择并测序结果在GenBank中进行生物信息学分析。结果构建MHBs酵母细胞表达载体,配合后筛选出既能在四缺培养基(SD/-Trp-Leu-Ade-His)上培养也能在铺有X-α-半乳糖苷酸的四缺培养基上生长,并变成蓝色的真阳性菌落2个,其中一个克隆为人醛缩酶B、另一个克隆为未知功能基因,新基因命名为MBP1。结论扩增出MHBs基因,用酵母双杂交技术筛选出2个与MHBs相互作用的肝细胞结合蛋白编码基因,为阐明MHBs的生物学功能及HBV损害肝细胞、致癌等方面的作用提供了新线索。     

丙型肝炎病毒非结构蛋白NS4A肝细胞结合蛋白基因的筛选与克隆

目的筛选并克隆人肝细胞cDNA文库中与丙型肝炎病毒（HCV）非结构蛋白4A（NS4A）相互作用蛋白的基因，明确其具体作用机制。方法应用酵母双杂交系统3，将聚合酶链反应法扩增的HCV NS4A基因连接入酵母表达载体PGBKT7中构建诱饵质粒，转化酵母细胞AH109并在其内表达，然后与转化了人肝cDNA文库质粒PACT2的酵母细胞Y187进行配合，在营养缺陷型培养基和X—α-半乳糖上进行双重筛选阳性菌落，提取阳性酵母菌落的质粒转化大肠杆菌，接种在氨苄青霉素-LB平板上，选择生长菌落，提取质粒酶切鉴定，测序并在GenBank中进行生物信息学分析。结果成功克隆出HCV NS4A基因，构建表达载体并在酵母细胞中表达，与肝文库配合后选出既能在四缺培养基又能在铺有X—α-半乳糖的四缺培养基上生长，并变成蓝色的真阳性菌落22个，序列分析显示，筛选到的肝细胞蛋白编码基因参与细胞能量代谢、蛋白翻译合成等多种生物学过程。结论成功克隆出HCV NS4A蛋白在肝细胞内的结合蛋白，为进一步研究NS4A蛋白的功能、阐明HCV致病的分子生物学机制提供了新线索。     

Screening of hepatocyte proteins binding to F protein of hepatitis C virus by yeast two-hybrid system

AIM: To investigate the biological function of F protein by yeast two-hybrid system. METHODS: We constructed F protein bait plasmid by cloning the gene of F protein into pGBKT7, then recombinant plasmid DNA was transformed into yeast AH109 (a type). The transformed yeast AH 109 was mated with yeast Y187 (a type) containing liver cDNA library plasmid in 2×YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing X-α-gal for selection and screening. After extracting and sequencing plasmids from positive (blue) colonies, we underwent sequence analysis by bioinformatics. RESULTS: Thirty-six colonies were selected and sequenced. Among them, 11 colonies were zymogen granule protein, 5 colonies were zinc finger protein, 4 colonies were zinc-α-2-glycoprotein, 1 colony was sialyltransferase, 1 colony was complement control protein factor I, 1 colony was vitronectin, and 2 colonies were new genes with unknown function. CONCLUSION: The yeast two-hybrid system is an effective method for identifying hepatocyte proteins interacting with F protein of hepatitis C virus. F protein may bind to different proteins.     

Screening and identification of interacting proteins with hepatitis B virus core protein in leukocytes and cloning of new gene C1

AIM:To investigate the biological function of HBcAgin pathogenesis of HBV replication in peripheral bloodmononuclear cells(PBMCs).METHODS:HBcAg region was amplified by polymerasechain reaction(PCR)and HBV HBcAg bait plasmidpGBKT7-HBcAg was constructed by routine molecularbiological methods.Then the recombinant plasmid DNAwas transformed into yeast AH109.After the HBV coreprotein was expressed in AH109 yeast strains(Westernblot analysis),yeast-two hybrid screening was performedby mating AH109 with Y187 containing leukocyte cDNAlibrary plasmid.Diploid yeast cells were plated onsynthetic dropout nutrient medium(SD/-Trp-Leu-His-Ade)(QDO)and synthetic dropout nutrient medium(SD/-Trp-Leu-His-Ade)(TDO).The second screeningwas performed with the LacZ report gene(yeast cellswere grown in QDO medium containing X-a-gal).Theinteraction between HBV core protein and the proteinobtained from positive colonies was further confirmedby repeating yeast-two hybrid.After plasmid DNA wasextracted from blue colonies and sequenced,the resultswere analyzed by bioinformatic methods.RESULTS:Eighteen colonies were obtained andsequenced,including hypermethylated in cancer 2(3colones),eukaryotic translation elongation factor 2(2colones),acetyl-coenzyme A synthetase 3(1 colone),DNA polymerase gamma(1 colone),putative translationinitiation factor(1 colone),chemokine(C-C motif)receptor 5(1 colone),mitochondrial ribosomal protein L41(1 colone),kyot binding protein genes(1 colone),RanBPM(1 colone),HBeAg-binding protein 3(1 colone),programmed cell death 2(1 colone).Four new geneswith unknown function were identified.CONCLUSION:Successful cloning of genes of HBV coreprotein interacting proteins in leukocytes may providesome new clues for studying the biological functions ofHBV core protein.     

Cloning and characterization of a novel hepatitis B virus core binding protein C12

AIM: To elucidate the biological function of HBV core antigen (HBcAg) on pathogenesis of hepatitis B, a novel gene C12 coding for protein with unknown function interacting with HBcAg in hepatocytes was identified and characterized. METHODS: HBcAg bait plasmid pGBKT7-HBcAg was constructed and transformed into yeast AH109, then the transformed yeast was mated with yeast Y187 containing liver complementary DNA (cDNA) library plasmid in 2×YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) and synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing X-α-gal for screening twice. After extracting and sequencing of plasmid from blue colonies, we isolated a cDNA clone encoding a novel protein designated as C12 that directly interacted with HBcAg. The interaction between HBcAg and C12 was verified again by re-mating. PEGFP-N1-C12 fluorescent protein fusion gene was transfected in 293 and L02 cell, and observed by fluorescent microscope. MTT reduction assay was used to study the action of C12 protein effect on metabolism of mammal cell. Yeast two-hybrid and cDNA microarray were performed to search binding protein and differential expression genes regulated by C12 protein. RESULTS: C12 gene was screened and identified by yeast two-hybrid system 3. The interaction between HBcAg and the novel protein coded by the new gene C12 was further confirmed by re-mating. After 48 h, fluorescence of fusion protein could be observed steadily in the 293 and L02 cell plasma. Under MTT assay, we found that the expression of C12 did not influence the growth of liver cells. Seventeen differential expression genes in HepG2 cells transfected with C12 protein expression plasmid by cDNA microarray, of which 16 genes were upregulated and 1 gene was downregulated by C12 protein. Twenty-one colonies containing 16 different genes coding for C12 protein binding proteins were isolated by yeast two-hybrid, there were 2 new genes with unknown function. CONCLUSION: The novel protein C12 is located in cell plasma, and its overexpression has no significant effect on the metabolism of liver cell. It interacts with many proteins in hepatocytes and may be involved in many processes of gene expression.     

丙型肝炎病毒F蛋白反式激活蛋白2基因在酵母细胞中的表达

目的为探讨丙型肝炎病毒(HCV)F蛋白反式激活蛋白2(HCV FTP2)的功能,在真核生物酵母细胞中表达HCV FTP2基因.方法以HepG2细胞来源的mRNA作为模板,经过逆转录聚合酶链反应(RT-PCR)扩增HCV FFP2基因,克隆到pGEM-T载体中,双酶切后回收连接到酵母表达质粒pGBKT7中表达.提取酵母蛋白质,进行十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)和Western blot免疫印迹分析.结果成功构建HCV FTP2基因酵母表达载体,Western blot免疫印迹显示HCV FTP2基因在酵母细胞中表达成功.表达产物相对分子质量27kD.结论HCV FTP2在酵母中表达成功.     

酵母双杂交技术筛选乙型肝炎e抗原反式激活蛋白结合蛋白的基因

目的筛选并克隆人肝细胞cDNA文库中与乙型肝炎e抗原反式激活蛋白(HBeAgTP)相互作用蛋白的基因。方法应用抑制性消减杂交技术及生物信息学技术筛选并克隆HBeAg反式激活的新型靶基因HBeAgTP。用聚合酶链反应(PCR)法扩增HBeAgTP基因,连接人酵母表达载体pGBKT7中构建诱饵质粒,转化酵母细胞AH109并在其内表达,然后与转化了人肝cDNA文库质粒pACT2的酵母细胞Y187进行配合,在营养缺陷型培养基和X-α-半乳糖(X-α gal)上进行双重筛选阳性菌落,PCR从中扩增出目的片段并测序,进行生物信息学分析。结果成功克隆出HBeAgTP基因并在酵母细胞中表达,应用酵母双杂交筛选出阳性菌落24个,经生物信息学分析为15种已知基因。结论成功克隆出HBeAgTP的结合蛋白,包括一些与细胞内蛋白质的转录、翻译、免疫调节及物贡和能量代谢相关的基因。     

转化生长因子β1活化肝星状细胞反式激活新基因剪切体的功能

目的 探讨反式激活新基因剪切体TTG 1 A的生物学功能和参与肝纤维化的致病机制.方法 应用酵母双杂交系统3,将PCR扩增的TTG1A基因与酵母表达载体pGBKT7连接,转化酵母细胞AH109,并在其内表达,而后与转化了人白细胞文库的质粒pACT2的单倍体酵母细胞Y187进行配合,在涂有X-α-gal营养缺陷型培养基上进行双重筛选,提取阳性酵母克隆的质粒转化大肠杆菌经Bgl Ⅱ酶切后测序,进行生物信息学分析. 结果成功构建了重组酵母表达载体pGBKT7-TTGlA.应用酵母双杂交系统3从人白细胞文库中筛选出19个与TTGlA相互作用的蛋白,其中包括人类主要组织相容性复合物Ⅱ型DP D(HLA-DP β),人类核糖体蛋白L30、人类核磷蛋白B23、人类核组蛋白2、人类ash2、人类变异的家族性睥性贫血和变异的异染性脑白质营养不良相关蛋白,人类死亡因子4(MORF4L1)、人类遍在蛋白偶连酶E2L3、人类载脂蛋白A-1(APOA1)、人类半乳凝素1以及5个未知功能蛋白. 结论 成功构建了重组酵母表达载体pGBKT7-TTGlA,初步揭示了新基因TTGlA的生物学功能,为进一步研究TGF β1介导的肝纤维化分子发病机制中的作用提供基础.     

Screening of genes of proteins interacting with p7 protein of hepatitis C virus from human liver cDNA library by yeast two-hybrid system

AIM: To investigate the biological function of p7 protein and to look for proteins interacting with p7 protein in hepatocytes. METHODS: We constructed p7 protein bait plasmid by cloning the gene of p7 protein into pGBKT7, then transformed it into yeast AH109 (a type). The transformed yeast was mated with yeast Y187 (a type) containing liver cDNA library plasmid, pACT2 in 2xYPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing x-α-gal for selection and screening. After extracting and sequencing of plasmids from blue colonies, we performed sequence analysis by bioinformatics. RESULTS: Fifty colonies were selected and sequenced. Among them, one colony was Homo sapiens signal sequence receptor, seven colonies were Homo sapiens H19, seven colonies were immunoglobulin superfamily containing leucine-rich repeat, three colonies were spermatid peri-nuclear RNA binding proteins, two colonies were membrane-spanning 4-domains, 24 colonies were cancer-associated antigens, four colonies were nucleoporin 214 ku and two colonies were CLL-associated antigens. CONCLUSION: The successful cloning of gene of protein interacting with p7 protein paves a way for the study of the physiological function of p7 protein and its associated protein.     

Screening of genes of proteins interacting with p7 protein of hepatitis C virus from human liver cDNA library by yeast two-hybrid system

AIM: To investigate the biological function of p7 protein and to look for proteins interacting with p7 protein in hepatocytes.METHODS: We constructed p7 protein bait plasmid by doning the gene of p7 protein into pGBKT7, then transformed it into yeast AH109 (a type). The transformed yeast was mated with yeast Y187 (α type) containing liver cDNA library plasmid, pACT2 in 2xYPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing x-α-gal for selection and screening. After extracting and sequencing of plasmids from blue colonies, we performed sequence analysis by bioinformatics.RESULTS: Fifty colonies were selected and sequenced.Among them, one colony was Homo sapiens signal sequence receptor, seven colonies were Homo sapiens H19, seven colonies were immunoglobulin superfamily containing leucine-rich repeat, three colonies were spermatid peri-nuclear RNA binding proteins, two colonies were membrane-spanning 4-domains, 24 colonies were cancer-associated antigens, four colonies were nucleoporin 214 ku and two colonies were CLL-associated antigens.CONCLUSION: The successful cloning of gene of protein interacting with p7 protein paves a way for the study of the physiological function of p7 protein and its associated protein.