CN105441463A - 一种三七转录因子基因PnbHLH1及其应用 - Google Patents
一种三七转录因子基因PnbHLH1及其应用 Download PDFInfo
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- CN105441463A CN105441463A CN201610001936.5A CN201610001936A CN105441463A CN 105441463 A CN105441463 A CN 105441463A CN 201610001936 A CN201610001936 A CN 201610001936A CN 105441463 A CN105441463 A CN 105441463A
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Abstract
本发明公开了一种三七转录因子基因<i>PnbHLH1</i>及其用途,即在提高三七皂苷生物合成关键酶基因表达量和增加三七愈伤组织中总皂苷与单体皂苷含量的应用,<i>PnbHLH1</i>基因核苷酸序列如SEQ?ID?NO︰1?所示,编码bHLH类转录因子;本发明采用功能基因组学和代谢工程相关技术证明三七PnbHLH1转录因子具有正调控三七皂苷生物合成的功能;将本发明所述的三七<i>PnbHLH1</i>转录因子基因构建到植物表达载体上并转入三七愈伤组织中使其过量表达,增强了三七皂苷合成途径关键酶基因的表达量,提高了三七总皂苷与单体皂苷的产量。
Description
技术领域
本发明涉及分子生物学以及基因工程领域,尤其是一种三七皂苷生物合成相关转录因子基因PnbHLH1及应用。
背景技术
三七Panaxnotoginseng(Burk.)F.H.Chen为五加科人参属植物,根和根茎入药,是云南的道地药材。三七作为传统中药已有悠久的应用历史,清代药学著作《本草纲目拾遗》中记载“人参补气第一,三七补血第一,味同而功亦等,故称人参三七,为中药之最珍贵者”。三七具有活血和止血的双重功效,是驰名中外的“云南白药”的重要成分。三七主产于我国云南省文山州,均为人工栽培品,全世界98%的三七原药材产于云南,三七已经成为云南省最重要的药材资源。
三七皂苷(saponinsofPanaxnotoginseng,PNS)是三七的主要药用成分,由多种四环三萜皂苷组成。目前,已从三七的根块、根茎(剪口)、茎、叶和花等部位分离和鉴定出70余种达玛烷型四环三萜皂苷,如人参皂苷Rb1、Rg1、Rh1、Rd、Re和F1等,这些单体皂苷大多数为达玛烷20(S)-原人参二醇型[20(S)-protopanaxadiol]和20(S)-原人参三醇型[20(S)-protopanaxatriol],未发现含有齐墩果酸型皂苷,这与人参和西洋参有显著差异。三七皂苷具有扩张冠状动脉和外周血管、增加脑血流量的作用;还有抑制血小板凝聚、降低血液粘稠度、抑制血栓形成的功效;同时,兼具降血脂、抗疲劳、耐缺氧,提高和增强巨噬细胞功能等作用。
三七为多年生草本植物,一般需生长3-7年方能入药,故名“三七”。三七对生境要求苛刻,适合种植三七的土地面积有限;同时,三七生长过程中病虫害严重,土壤次生盐渍化和酸化突出,导致三七种植需要“轮作”。这种生长周期长,土地利用率低下的现状,制约了三七产业的可持续发展。近些年,以三七为组分的药品市场迅速扩大,导致三七药材需求增长,供需矛盾突出。鉴于人工栽培时间长,化学合成机理和路线不够清晰等弊端,利用生物工程技术和基因调控的方法来生产三七皂苷逐渐成为研究热点。
茉莉酸甲酯(MeJA)是植物重要次级代谢信号分子,在植物抗逆自我保护过程中扮演重要角色,能够引起细胞次生代谢物的合成。目前,有关茉莉酸甲酯介导的植物次生代谢合成过程已经从研究重要基因的表达逐步过渡到相关转录因子的研究。越来越多的证据表明,控制重要萜类次生代谢物合成的转录因子大多能被茉莉酸甲酯诱导表达。
转录因子对基因的转录激活是植物次生代谢过程重要的调控环节。利用转录因子作为改造植物代谢途径的工具,以其独有的“多点调控”优势,弥补了代谢工程操作中单个关键酶基因作用不足和多个关键酶基因可能产生组成性致死表达的情况,成为一种新的策略。次生代谢途径中多个功能相关的酶基因常被同一转录因子正调控或负调控,对转录因子进行基因修饰显然比多基因操作更容易改良目标次生代谢途径。
含碱性/螺旋-环-螺旋结构(basic/helix-loop-helix,bHLH)的转录因子广泛存在于生物中,是真核生物中一类含有众多成员的重要转录因子。越来越多的研究表明该类转录因子对真核生物的次生代谢过程具有重要调控作用。例如青蒿(Artemisiaapiacea)AabHLH1转录因子可以提高青蒿素生物合成相关的紫穗槐4,11-二烯合酶(ADS)和细胞色素P450单加氧酶(CYP71AV1)基因的表达量,正调控青蒿素的合成;红豆杉(Taxuschinensis)bHLH类转录因子TcJAMYC可与紫杉醇生物合成相关基因启动子的E-box结合,激活这些关键酶基因的表达,提高紫杉醇的合成量。
随着对植物次生代谢网络的深入解析和调控机制的阐明,特别是调节特定次生代谢物合成的转录因子的分离和鉴定,基于转录因子的基因工程将为开发利用植物次生代谢物提供更加有效的手段。本发明以体外培养的三七愈伤组织为研究对象,克隆PnbHLH1转录因子基因,并对该转录因子进行分析和功能鉴定,明确PnbHLH1转录因子在三七皂苷生物合成过程中的地位和作用,为获得高效、稳定的三七皂苷合成调控技术和同源或异源高效表达系统的建立提供理论参考和依据。
发明内容
本发明的目的是从三七中克隆获得可调控三七皂苷生物合成的转录因子基因PnbHLH1以及明确该转录因子的应用,即在提高三七皂苷合成代谢途径中关键酶基因表达量和增加三七愈伤组织中总皂苷与单体皂苷含量的应用。
本发明利用酵母单杂交方法和cDNA末端快速扩增技术从三七中克隆到一个与MeJA诱导相关的bHLH类转录因子基因并对其编码蛋白进行功能鉴定。发明人将这个基因命名为PnbHLH1,其中所述的cDNA全长如SEQIDNO︰1所示。对该基因进行序列分析,表明PnbHLH1全长cDNA大小为1430bp,PnbHLH1编码区是序列表SEQIDNO︰1中第7-972位所示的核苷酸序列,具有966bp的开放阅读框(Openreadingframe,ORF)、6bp的5’非翻译区和458bp的3’非翻译区,编码含有321个氨基酸的蛋白质,氨基酸序列如SEQIDNO︰2所示。利用植物表达载体,通过农杆菌介导法将本发明的PnbHLH1转录因子基因导入三七愈伤组织中,可提高三七皂苷合成途径关键酶基因的表达量,使三七皂苷的产量增加。
上述转录因子基因可应用于正调控三七皂苷的生物合成,具体操作如下:
(1)基因全长cDNA的获得:首先利用酵母单杂交方法筛选出三七中与MeJA诱导相关的bHLH类转录因子,再利用cDNA末端快速扩增技术(3’RACE)获得PnbHLH1的全长cDNA,设计引物扩增PnbHLH1的ORF框,然后将其连接到pGEM-Teasy载体上,经测序验证获得具有目的基因的克隆;
(2)植物表达载体构建与遗传转化:用限制性内切酶XbaI和PstI酶切pGEM-T-PnbHLH1质粒,通过胶回收获得目的基因片段;用同样的内切酶消化植物表达载体pCAMBIA2300S,胶回收获得载体大片段;将目的基因片段与pCAMBIA2300S载体片段连接,构建植物超表达载体pCAMBIA2300S-PnbHLH1;通过液氮冻融法将pCAMBIA2300S-PnbHLH1质粒导入农杆菌菌株EHA105中。利用农杆菌介导的遗传转化法,将PnbHLH1导入三七愈伤组织中使其过量表达。通过抗生素筛选和qRT-PCR筛选阳性转基因细胞系;
(3)转基因细胞系总皂苷含量检测:提取三七非转基因和转基因细胞系中的皂苷,分析非转基因和转基因细胞系间总皂苷含量的差异,筛选出总皂苷含量得到提高的阳性转基因细胞系;
(4)转基因细胞系部分重要单体皂苷含量检测:制备三七非转基因和总皂苷含量得到提高的转基因细胞系的皂苷溶液,利用HPLC法对非转基因和转基因细胞系中的部分重要单体皂苷含量进行测定,分析非转基因和转基因细胞系间单体皂苷含量的差异,最后筛选出单体皂苷含量得到提高的阳性转基因细胞系。
本发明为提高三七中皂苷的含量提供了一种新方法,利用生物工程技术和基因调控的方法可更高效率合成三七皂苷,克服了人工栽培周期长、化学合成机理和路线不够清晰等缺点;将转录因子PnbHLH1基因导入三七细胞中表达,使三七皂苷生物合成途径关键酶基因的表达量提高,增加了三七皂苷的产量,为大规模产业化生产三七皂苷提供了理论参考和科学依据。
附图说明
图1为本发明中三七总RNA电泳图谱;
图2为本发明中纯化mRNA电泳图谱,其中M为DL2000DNAMarker,1为纯化的mRNA;
图3为本发明中酵母单杂交表达文库中片段扩增结果,其中M为DL2000DNAMarker,1-16为不同的酵母菌落PCR产物;
图4为本发明中PnbHLH1全长cDNA扩增结果,其中M为DL2000DNAMarker,1为PnbHLH1全长cDNA扩增产物;
图5为本发明中PnbHLH1的三维结构预测;
图6为本发明中qRT-PCR结果分析图,表示三七皂苷合成途径中受PnbHLH1调控的FPS、HMGR和DS基因在野生型和转基因细胞系中的表达水平,其中C为野生型细胞系,1-3为转基因细胞系;
图7为本发明中三七总皂苷含量测定结果,其中C为野生型细胞系,1-3为转基因细胞系;
图8为本发明三七细胞中部分重要单体皂苷含量测定结果,其中C为野生型细胞系,1-3为转基因细胞系。
具体实施方式
下面通过附图和实施例对本发明进一步说明,但本发明保护范围不局限于所述内容,实施例中方法如无特殊说明均为常规方法,使用的试剂如无特殊说明均为常规市售试剂或按常规方法配制的试剂。
实施例1:PnbHLH1基因的克隆以及生物信息学分析
采用改良的异硫氰酸胍法提取经茉莉酸甲酯处理3-6h的三七细胞总RNA(图1),并参照NucleoTeap?mRNA(MACHERGY-NAGEL)试剂盒进行mRNA的分离(图2);取1μgmRNA按照MatchmakerTMGoldYeastOne-HybridLibraryScreeningSystem构建cDNA文库,并利用Trimmer-2cDNAnormalizationkit试剂盒进行文库的均一化。
设计添加了酶切位点XhoI和HindⅢ的诱饵序列---3个重复的JERE序列,通过退火将该序列合成为双链。用XhoI和Hind对pAbAi载体和JERE诱饵序列进行双酶切,胶回收目的片段,将回收的JERE诱饵片段与线性pAbAi载体片段4℃过夜进行连接,然后转化入大肠杆菌感受态中,挑选单克隆进行菌液PCR检测并对阳性单克隆进行测序;引物根据插入片段进行设计,上游引物为:5’-GTTCCTTATATGTAGCTTTCGACAT-3’,下游引物为:5’-CTCCTTTCAAAGAAGGCGGTC-3’。将成功连接的pJERE-AbAi重组质粒利用同源法导入到Y1Hgold酵母感受态细胞中,再将均一化后的三七细胞cDNA转入该酵母感受态细胞中,将转化细胞涂布到含AbA抗性的SD/-Leu酵母培养基上,30℃培养3-5天。待酵母长出后,进行酵母菌落PCR验证(图3),挑选插入片段大于500bp的克隆进行测序。
由测序结果知,本实验经酵母单杂交筛选获得了与茉莉酸甲酯诱导相关的bHLH类转录因子基因。通过使用cDNA末端快速扩增技术(3’RACE)得到了PnbHLH1基因的3’片段,其引物为5’-GCACTCTCTTCTCTAGTCCCTGGCC-3’。再根据PnbHLH1基因的5’和3’末端序列设计引物,用于扩增PnbHLH1基因的cDNA全长,分别为PnbHLH1F:5’-CAGGGAATGGAGGATCCTTATTCCA-3’;PnbHLH1R:5’-GGGAAAAGTTATTTCATTAACACTGC-3’。PCR反应条件:94℃,5min;94℃,30s;53℃,30s;72℃,90s,32个循环;72℃,10min。将PCR产物用1.2%的琼脂糖凝胶分离(图4)、胶回收并连接到pGEMT-easy载体上,转化大肠杆菌感受态,挑单克隆摇菌,菌液PCR检测后送测序。
最终获得的PnbHLH1全长cDNA大小为1430bp,通过NCBIORFfinder(http://www.ncbi.nlm.nih.gov/gorf/gorf.html)分析发现其包含一个966bp的ORF(见序列表)。PnbHLH1编码蛋白的分子量约为36.2KD,等电点为7.60,不稳定系数为41.40,预测PnbHLH1编码的蛋白质不稳定。生物信息学预测PnbHLH1不包含跨膜区,不含信号肽,具有一个bHLH转录因子特征保守结构域。通过在线工具iPSORT预测PnbHLH1可能定位于细胞核。借助SWISS-MODEL对PnbHLH1进行三维结构预测分析(图5),结果表明,与长春花CrMYC1转录因子的空间结构相比,两者主要的bHLH结构域较为形似,这进一步说明PnbHLH1属于bHLH类转录因子。
实施例2:植物表达载体构建
根据PnbHLH1基因ORF框的5’和3’末端序列设计引物,用于扩增PnbHLH1基因的ORF,分别为上游引物:5’-TCTAGAATGGAGGATCCTTATTCCAATATCC-3’;下游引物:5’-CTGCAGTCACATTAACTGTTTGAGAGCTGCG-3’。PCR反应条件:94℃,5min;94℃,30s;56℃,30s;72℃,1min,32个循环;72℃,10min。将PCR产物用1.2%的琼脂糖凝胶分离、胶回收并连接到pGEMT-easy载体上,转化大肠杆菌感受态,挑单克隆摇菌,菌液PCR检测后送测序。
采用SanPrep柱式质粒DNA小量抽提试剂盒(上海生工)提取经测序正确的大肠杆菌质粒pGEM-T-PnbHLH1以及植物表达载体pCAMBIA2300S的质粒,取1μL用于琼脂糖凝胶电泳以检测所提取质粒的完整性和浓度高低。用XbaI(TaKaRa)和PstI(TaKaRa)分别对质粒pGEM-T-PnbHLH1和pCAMBIA2300S进行双酶切(100μL体系),反应体系和操作过程为:取20μLpGEM-T-PnbHLH1或pCAMBIA2300S质粒,依次加入10μL10×Mbuffer、5μLXbaI、5μLPstI、60μLddH2O,混匀后短时离心,置于37℃过夜反应。将所有酶切产物点于琼脂糖凝胶中进行电泳,然后对PnbHLH1片段和pCAMBIA2300S大片段分别进行胶回收,整个过程使用SanPrep柱式DNA胶回收试剂盒(上海生工)。取1μL回收产物通过琼脂糖凝胶电泳检测回收片段的大小以及浓度,置于-20℃保存备用。
利用T4DNALigase(TaKaRa),将回收的PnbHLH1DNA片段和pCAMBIA2300S载体片段连接起来,反应体系(20μL)和操作过程为:取10μLPnbHLH1DNA片段依次加入2μLpCAMBIA2300S载体DNA、2μL10×T4DNALigaseBuffer、1μLT4DNALigase、5μLddH2O,混匀后短时离心,置于16℃水浴过夜反应。接着采用热激转化法将连接产物转入大肠杆菌Trans1-T1中,用含有50mg/L卡那霉素(kanamycin,Km)的固体培养基筛选阳性克隆。挑选单菌落摇菌,以菌液为模板用扩增PnbHLH1的特异性引物进行PCR,挑选出PnbHLH1与pCAMBIA2300S成功连接的克隆,所检测的菌株若为阳性,加入20%甘油混匀后置于-80℃保存备用。
用试剂盒提取并纯化上述大肠杆菌中的pCAMBIA2300S-PnbHLH1质粒。制备农杆菌EHA105菌株的感受态细胞并分装于1.5mL离心管中,每管150μL,液氮速冻后置于-80℃保存备用。采用液氮冻融法将上述构建的植物表达载体pCAMBIA2300S-PnbHLH1转入所制备的农杆菌EHA105感受态细胞中。操作步骤为:取3μgpCAMBIA2300S-PnbHLH1质粒加入含有150μL感受态细胞的离心管中,轻轻混匀后冰浴30min,接着转入液氮中速冻5min,然后迅速置于37℃水浴5min,之后立即冰浴2min,加入600μLLB液体培养基,28℃振荡培养4h。将活化后的农杆菌涂于含有50mg/LKm的LB固体培养基上,28℃静置培养。挑选单菌落摇菌,用扩增PnbHLH1的特异引物进行PCR,检测pCAMBIA2300S-PnbHLH1是否转入农杆菌中。对于阳性克隆,加入甘油后置于-80℃保存备用。
实施例3:农杆菌介导的三七遗传转化
从-80℃冰箱中取出保存的含有pCAMBIA2300S-PnbHLH1质粒的农杆菌EHA105菌种,接种于5mL含有50mg/LKm和25mg/L利福平的LB液体培养基中,28℃培养至浑浊。吸取1mL浑浊的菌液至含有50mg/LKm的LB固体培养基上,28℃培养48h。将LB固体培养基上的农杆菌刮下适量接种于MGL液体培养基中,附加40mg/L的乙酰丁香酮,28℃振荡培养至OD600为0.6时停止摇菌,所得菌液用于侵染。
将生长状态较好的三七愈伤组织接种到MS预培养基(含35mg/L乙酰丁香酮)上进行预培养3天。预培养完成后,将愈伤组织完全浸泡于上述农杆菌菌液中进行振荡培养。浸染完毕,除去菌液,用无菌的滤纸吸取愈伤组织表面的菌液,再将愈伤组织接种到MS共培养基(含35mg/L乙酰丁香酮)上进行共培养3天。共培养完成后,用无菌水对愈伤组织进行洗涤,再转接于含400mg/L头孢霉素的MS培养基上进行除菌培养,于25℃暗培养15天,防止农杆菌过度生长。最后将愈伤组织转接到筛选培养基中,每45天继代一次。经过5次筛选,最终分离出具有Km抗性的增值速度快的纯的细胞系,用于后续检测。
实施例4:PnbHLH1基因超表达对三七皂苷合成途径关键酶基因FPS、HMGR和DS表达
量的影响
选取25天左右、生长状态良好的三七转基因细胞系和野生型细胞系,分别提取RNA,然后按照GoTaq?2-StepRT-qPCRSystem试剂盒说明书合成cDNA,反应体系和操作过程为:在离心管中加入4μg总RNA和1μLOligo(dT)15,用Nuclease-freeWater补齐至10μL,将反应体系放于70℃变性5min,然后置于冰上5min。随后将离心管在离心机中短暂离心,使反应液收集于管底,再向其中加入4μLGoScriptTM5×ReactionBuffer、2μLMgCl2(25mM)、1μLPCRNucleotideMix(10mM)、0.5μLRecombinantRNasinRibonucleaseInhibitor和1μLGoScriptTMReverseTranscriptase,将整个反应体系漩涡混匀,离心收集到管底,将反应物置于42℃恒温水浴锅中反应1h,再于70℃水浴中维持15min以终止反应,最后将合成的cDNA置于-20℃冰箱中保存备用。
以该cDNA为模板,根据三七GAPDH基因(登录号:KF815711.1)、法尼基焦磷酸合成酶(Farnesyldiphosphatesynthase,FPS)基因(登录号:DQ059550.1)、3-羟基-3-甲基戊二酰辅酶A还原酶(3-hydroxy-3-methylglutaryl-CoAreducetase,HMGR)基因(登录号:KJ578757.1)以及达玛烯二醇合酶(Dammarenediol-IIsynthase)基因(登录号:KC953035.1)设计引物,依据GoTaq?2-StepRT-qPCRSystem试剂盒说明书进行荧光半定量PCR扩增三七内参基因和皂苷合成途径关键酶基因。所用引物序列为GAPDHF:5’-CTACCAACTGTCTTGCTCCCCT-3’,GAPDHR:5’-TGATGCAGCTCTTCCACCTCTC-3’;FPSF:5’-CGGATGCTGGACTATAATGTG-3’,FPSR:5’-ATTTACGGCAATCATACCAACC-3’;HMGRF:5’-GGCAGGACCCAGCACAAAATA-3’,HMGRR:5’-ACACCCAGAAGGTTCAAGCAA-3’;DSF:5’-TATGAGTGGGAAGGGTGC-3’,DSR:5’-TGGCGATAATTGCTTGAGTA-3’。具体反应体系和操作过程为:在PCR管中加入20ngcDNA、25μLGoTaq?qPCRMasterMix(2×)和0.2μLqPCRPrimers(GAPDHF/GAPDHR,FPSF/FPSR,HMGRF/HMGRR,DSF/DSR,10mM),用Nuclease-FreeWater补齐至50μL;将反应体系漩涡混匀后,离心将其收集到管底,随后将其置于荧光定量PCR仪中进行反应,采用两步法进行荧光定量PCR,反应参数如下:热启动95℃2min;变性95℃15s,退火/延伸60℃1min,共45个循环。每个样品对应的每个基因重复检测2次。
qRT-PCR结果显示,转PnbHLH1基因三七细胞中FPS、HMGR和DS基因的表达量都比野生型的高(图6),说明PnbHLH1作为转录因子,能够促进三七皂苷合成代谢途径中关键酶基因FPS、HMGR和DS的表达。图中,C表示对照组野生型细胞系,1、2和3分别表示不同的转基因细胞系实验组。
实施例5:PnbHLH1基因超表达对三七总皂苷合成量的影响
选取生长35天左右的转基因细胞系和野生型细胞系,分别置于洗净的100mL三角瓶中,加入20mL的甲醇溶液浸泡过夜后,常温超声波处理1h。过滤,收集滤液,将滤液挥干后再用甲醇溶解,定容至25mL,得粗提液。将残渣在50℃下烘至恒重,称重。精密吸取粗提液5mL,置50mL烧杯中水浴蒸干。蒸干后用4倍体积的蒸馏水分次溶解,充分溶解后过滤,滤液全部转移至已处理好的Hsp100大孔树脂柱内,先用2个柱体积的蒸馏水慢慢洗去糖类等杂质。Molish反应检测糖类杂质是否去除干净,如果结果呈阳性,继续用蒸馏水洗至阴性,然后用75%乙醇溶液洗脱2个柱体积,收集醇液,水浴蒸干,残渣用甲醇溶液溶解,定容至25mL。
精确吸取此样品150μL至带塞的10mL试管中(设3个重复),挥干溶剂,加入新配制的5%香草醛-冰醋酸溶液0.2mL,高氯酸0.8mL,混匀后60℃水浴加热15min,立即用冰水冷却,加入5mL冰醋酸,混匀静止10min后554nm测吸光度,参照标准曲线计算PNS含量。结果显示,转PnbHLH1基因三七细胞中总皂苷含量高于野生型细胞中总皂苷含量(图7),结合qRT-PCR结果,表明PnbHLH1转录因子参与了三七皂苷的合成代谢调控,有助于皂苷产量的提高。图中,C表示对照组野生型细胞系,1、2和3分别表示不同的转基因细胞系实验组。
实施例6:PnbHLH1基因超表达对三七单体皂苷合成量的影响
利用HPLC法测定三七细胞系中部分重要单体皂苷(Rb1、Rg1、Rh1、Rd、Re和F1)的含量。高效液相色谱条件为:高效液相色谱仪(戴安ULTIMATE30R00LPG-3400A四元梯度泵,WPS-3000SL自动进样器,PDA-3000二极管阵列检测器,TCC-3000柱温箱),WaterssymmertryC18色谱柱(4.6×250mm,5μm),采用乙腈(A):水(B)为流动相进行线性梯度洗脱(v/v),检测柱温30℃,检测波长为203nm,流速设定为1.0mL/min。
精确称取适量的单体皂苷Rb1、Rg1、Rh1、Rd、Re和F1标准品,加入1mL甲醇溶液,制成浓度分别为340,300,260,320,280,300μg/mL的标准品混合溶液。分别吸取4,6,8,10,15,20,25,30μL的混合标准品溶液注入高效液相色谱仪,根据上述色谱条件进行测定。以进样量(μg)为横坐标(x),色谱峰的面积为纵坐标(y),绘制得出各单体皂苷的线性回归方程。
分别称取0.1g非转基因和总皂苷含量得到提高的转基因三七细胞粉末于干净的50mL三角瓶中,各自加入10mL70%甲醇溶液,过夜浸泡后用超声破碎仪处理90min(60w,4s/5s)。超声结束后,去滤渣留滤液,将滤液放置在50℃烘箱中过夜烘干。加10mL蒸馏水溶解烘干后的残余物,之后用相同体积的水饱合正丁醇(勿使用未水饱合过的正丁醇)萃取2-3次,将最终收集到的萃取液放置在50℃烘箱中过夜烘干。用适量100%甲醇溶解烘干后的残余物,之后将溶液定容至5mL,混合均匀后经0.45μm滤膜过滤,利用高效液相色谱测定皂苷溶液中部分重要单体皂苷的含量。结果显示,非转基因与转基因三七细胞系均检测到了Rb1、Rg1、Rh1、Rd、Re和F1这六种单体皂苷,转基因细胞系与非转基因细胞系相比,这六种单体皂苷均出现不同幅度增长(图8)。目前普遍认为,T-DNA插入到宿主基因组上的位点具有随机性,但本实验结果证明这种随机性当中可能蕴含着某种定向(趋向)性。图中,C表示对照组野生型细胞系,1、2和3分别表示不同的转基因细胞系实验组。
序列表
<110>昆明理工大学
<120>一种三七转录因子基因PnbHLH1及其应用
<160>17
<170>PatentInversion3.5
<210>1
<211>1430
<212>DNA
<213>Panaxnotoginseng
<220>
<221>mRNA
<222>(1)..(1430)
<220>
<221>5'UTR
<222>(1)..(6)
<220>
<221>CDS
<222>(7)..(972)
<220>
<221>3'UTR
<222>(973)..(1430)
<400>1
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aggataaatggtttttttggtggatggagaagcaggcttgggtaccagtgaagtgttagt1320
tcaatgttttagagtcctcttgaaatgtttcttaggtctctttctcttatgtaattgcat1380
tttccgtgtaacagttctaaatttgcagtgttaatgaaataacttttccc1430
<210>2
<211>321
<212>PRT
<213>Panaxnotoginseng
<400>2
MetGluAspProTyrSerAsnIleGlnTrpProMetAsnSerPheAsp
151015
GluLeuSerAlaLeuSerLeuAlaAlaAlaPheGlyGluAsnLeuHis
202530
HisSerPheTyrGlnProMetTyrAspIleLysProSerProProGlu
354045
ValSerCysThrValThrGluArgProMetLysGlnLeuLysThrAsn
505560
CysTrpSerSerGluArgThrAspHisThrSerAsnThrGlnAlaThr
65707580
TyrSerAsnTyrThrAsnGlnPheGlyAsnValLysProLysAspGlu
859095
ValLeuProSerLysSerThrThrThrLeuProIleAspLeuMetThr
100105110
SerGlnGlySerPheGluAsnGlnAsnTyrValPheLysAlaSerGln
115120125
GlyAlaLysArgIleSerThrGlyAlaGlnLeuSerGlnAlaGlnAsp
130135140
HisIleMetAlaGluArgLysArgArgGluLysLeuSerGlnArgPhe
145150155160
IleAlaLeuSerAlaLeuValProGlyLeuLysLysMetAspLysAla
165170175
SerValLeuGlyAspAlaIleLysTyrLeuLysGlnLeuGlnGluArg
180185190
ValLysThrLeuGluGluGlnThrArgLysLysSerThrGluSerVal
195200205
ValPheValLysLysTyrGluLeuLeuAlaAspAspAspLysSerSer
210215220
SerGlyGluGlnPheCysGlyAsnProValAsnGluProGlnProGlu
225230235240
IleGluAlaArgPheSerAspLysAspValLeuIleArgIleHisCys
245250255
GluLysLysLysGlyValLeuGluLysThrIleAlaGluIleGluLys
260265270
PheGlnLeuLeuIleMetAsnSerThrAlaLeuThrPheGlyThrSer
275280285
SerLeuAspIleThrIleIleAlaLeuMetAspGluLysPheThrMet
290295300
ThrAlaLysAspLeuValLysAsnLeuCysAlaAlaLeuLysGlnLeu
305310315320
Met
<210>3
<211>25
<212>DNA
<213>人工序列
<400>3
gttccttatatgtagctttcgacat25
<210>4
<211>21
<212>DNA
<213>人工序列
<400>4
ctcctttcaaagaaggcggtc21
<210>5
<211>25
<212>DNA
<213>人工序列
<400>5
gcactctcttctctagtccctggcc25
<210>6
<211>25
<212>DNA
<213>人工序列
<400>6
cagggaatggaggatccttattcca25
<210>7
<211>26
<212>DNA
<213>人工序列
<400>7
gggaaaagttatttcattaacactgc26
<210>8
<211>31
<212>DNA
<213>人工序列
<400>8
tctagaatggaggatccttattccaatatcc31
<210>9
<211>31
<212>DNA
<213>人工序列
<400>9
ctgcagtcacattaactgtttgagagctgcg31
<210>10
<211>22
<212>DNA
<213>人工序列
<400>10
ctaccaactgtcttgctcccct22
<210>11
<211>22
<212>DNA
<213>人工序列
<400>11
tgatgcagctcttccacctctc22
<210>12
<211>21
<212>DNA
<213>人工序列
<400>12
cggatgctggactataatgtg21
<210>13
<211>22
<212>DNA
<213>人工序列
<400>13
atttacggcaatcataccaacc22
<210>14
<211>21
<212>DNA
<213>人工序列
<400>14
ggcaggacccagcacaaaata21
<210>15
<211>21
<212>DNA
<213>人工序列
<400>15
acacccagaaggttcaagcaa21
<210>16
<211>18
<212>DNA
<213>人工序列
<400>16
tatgagtgggaagggtgc18
<210>17
<211>20
<212>DNA
<213>人工序列
<400>17
tggcgataattgcttgagta20
Claims (2)
1.一种三七转录因子基因PnbHLH1,其特征在于:其核苷酸序列如SEQIDNO︰1所示。
2.权利要求1所述的三七转录因子基因PnbHLH1在提高三七皂苷合成代谢途径中关键酶基因表达量和增加三七愈伤组织中总皂苷与单体皂苷含量的应用。
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CN109295069A (zh) * | 2018-09-19 | 2019-02-01 | 昆明理工大学 | 珠子参转录因子基因PjMYB1的应用 |
CN112831504A (zh) * | 2021-03-16 | 2021-05-25 | 昆明理工大学 | 三七WRKY转录因子基因PnWRKY9及其应用 |
CN113265408A (zh) * | 2021-05-27 | 2021-08-17 | 昆明理工大学 | 一种三七DOF转录因子基因PnDof1及其应用 |
CN116218877A (zh) * | 2023-04-28 | 2023-06-06 | 昆明理工大学 | 三七WRKY转录因子PnWRKY12的应用 |
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CN105861517B (zh) * | 2016-04-20 | 2019-07-05 | 昆明理工大学 | 一种三七抗菌肽基因PnSN1及其应用 |
CN109295069A (zh) * | 2018-09-19 | 2019-02-01 | 昆明理工大学 | 珠子参转录因子基因PjMYB1的应用 |
CN109295069B (zh) * | 2018-09-19 | 2021-08-20 | 昆明理工大学 | 珠子参转录因子基因PjMYB1的应用 |
CN112831504A (zh) * | 2021-03-16 | 2021-05-25 | 昆明理工大学 | 三七WRKY转录因子基因PnWRKY9及其应用 |
CN112831504B (zh) * | 2021-03-16 | 2023-03-24 | 昆明理工大学 | 三七WRKY转录因子基因PnWRKY9及其应用 |
CN113265408A (zh) * | 2021-05-27 | 2021-08-17 | 昆明理工大学 | 一种三七DOF转录因子基因PnDof1及其应用 |
CN113265408B (zh) * | 2021-05-27 | 2022-06-14 | 昆明理工大学 | 一种三七DOF转录因子基因PnDof1及其应用 |
CN116218877A (zh) * | 2023-04-28 | 2023-06-06 | 昆明理工大学 | 三七WRKY转录因子PnWRKY12的应用 |
CN116218877B (zh) * | 2023-04-28 | 2023-11-24 | 昆明理工大学 | 三七WRKY转录因子PnWRKY12的应用 |
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