CN113234739A - 烟草细胞色素p450亚家族cyp710a基因及应用 - Google Patents
烟草细胞色素p450亚家族cyp710a基因及应用 Download PDFInfo
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- CN113234739A CN113234739A CN202110580258.3A CN202110580258A CN113234739A CN 113234739 A CN113234739 A CN 113234739A CN 202110580258 A CN202110580258 A CN 202110580258A CN 113234739 A CN113234739 A CN 113234739A
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Abstract
本发明涉及一种烟草细胞色素P450亚家族CYP710A基因及应用,细胞色素P450亚家族CYP710A基因的核苷酸序列如SEQ ID NO.1所示。本申请中,通过对特定烟草细胞色素P450亚家族CYP710A基因的初步研究,发现其与烟草叶片中豆甾醇含量高度相关,在本氏烟草中将该基因沉默,烟草叶片中豆甾醇含量发生了明显降低,降低了53.4%,而总甾醇含量变化不明显。基于这一特性,可利用基因工程手段,为烟叶品质调控、烟草新品种培育提供一定的应用基础和参考借鉴。
Description
技术领域
本发明属于烟草基因工程领域,具体涉及一种烟草细胞色素P450亚家族CYP710A基因及应用。
背景技术
植物甾醇是生物膜系统的重要组成成分,可以调控植物生长发育,响应多种生物和非生物胁迫。甾醇类物质约占烟叶质量的0.1%~0.3%,烟草中的甾醇类化合物主要有胆甾醇(cholesterol)、豆甾醇(stigmasterol)、菜油甾醇(campasterol)、和β-谷甾醇((β-sitosterol)等。已有文献报道,其中的豆甾醇是卷烟烟气苯并芘的重要来源。因此,降低烟草成熟叶片中豆甾醇含量可有效降低卷烟烟气苯并芘含量。
目前植物中甾醇的合成代谢已有研究,但栽培烟草中调控豆甾醇合成的基因却鲜有报道。烟草中影响豆甾醇含量的基因功能研究将为烟叶安全性改善、烟草品种遗传改良提供理论支持,对提高我国烟草产品安全性具有重要的意义。
发明内容
本发明的目的在于提供一种烟草细胞色素P450亚家族CYP710A基因及应用,以改善烟草中豆甾醇含量,从而为烟叶品质调控、烟草新品种培育奠定一定基础。
为实现上述发明目的,本申请采用如下技术方案:
一种烟草细胞色素P450亚家族CYP710A基因,核苷酸序列如SEQ ID NO.1所示,含有1521个碱基,命名为NtCYP710A。
进一步的,烟草细胞色素P450亚家族CYP710A基因的编码蛋白,氨基酸序列如SEQID NO.2所示,由506个氨基酸残基组成。
进一步的,烟草细胞色素P450亚家族CYP710A基因的PCR扩增制备方法,包括如下步骤:
(1)提取基因组,并反转录为cDNA备用;
(2)设计PCR扩增用引物,并进行PCR扩增,具体引物序列设计如下:
NtCYP710A-F:5’-TCCTCTTTGCAGCGCAAG-3’,
NtCYP710A-R:5’-CCGGAATTCTTCGCCAGC-3’。
进一步的,在步骤(1)中提取基因组时,以烟草品种红花大金元叶片为样品。
上述任一项的烟草细胞色素P450亚家族CYP710A基因的应用,利用基因沉默技术,通过调节烟草P450酶基因的表达量,来调节控制烟叶中豆甾醇含量。
进一步的,通过转基因技术、瞬时表达技术或基因组编辑技术,构建含有烟草细胞色素P450亚家族CYP710A基因的病毒诱导沉默载体、RNAi干涉载体、超表达载体,转化烟草,筛选获得豆甾醇含量变化的烟草新品种。
具体例如:利用病毒诱导的基因沉默(VIGS)的技术,干扰NtCYP710A基因的表达使其沉默,NtCYP710A基因沉默植株中豆甾醇含量显著下降,进而获得豆甾醇含量下降的植物新品种。
本发明的有益效果是:
基于甾醇对植物生长发育和对烟叶安全性的重要作用,对烟草豆甾醇调控基因进行深入研究,利用基因工程构建新的烟草品种,为改善烟草品种奠定良好应用基础。本申请中,通过对特定烟草细胞色素P450亚家族CYP710A基因NtCYP710A的初步研究,发现其与烟草叶片中豆甾醇含量高度相关,在将该基因沉默后,烟草叶片中豆甾醇含量发生了明显降低,总甾醇含量变化不明显。基于这一特性,可为烟叶品质调控、烟草新品种培育提供一定的应用基础和参考借鉴。
附图说明
图1为与对照植株相比,NtCYP710A基因沉默植株中该基因的相对表达量;
图2为病毒诱导基因沉默的烟叶及对照烟叶中的甾醇含量比较。
具体实施方式
以下通过具体实施例对本发明的技术方案进行详细的说明,以下的实施例仅是示例性的,仅能用来解释和说明本发明的技术方案,而不能解释为是对本发明技术方案的限制。
在本申请的各实施例中,没有注明具体技术或条件者,按照本领域内现有技术或条件进行,所使用的材料或设备未注明生产厂商者,均为可以通过购买获得的常规产品。
本发明除非另有说明,否则百分号为体积百分数,比例为体积比。
生物材料:
本氏烟草,一种现常用烟草材料,育苗钵中育苗,待发芽后两周进行分苗,种于塑料钵(10cm×10cm)中,22℃、16h光/8h暗条件下进行日常肥水管理等栽培管理。
下述实施例中所采用的VIGS载体是一种来自烟草脆裂病毒的病毒载体(tobaccorattle virus,TRV),所具体利用的TRV2(一种常用载体)带有卡那霉素筛选标记和35S启动子,同时TRV2带有EcoR I和BamH I等多克隆位点,可以用来携带和转化外源基因。
实验试剂:
LB液体培养基,1L含量中含有:10g细菌蛋白胨(bacteriological peptone);10g氯化钠(NaCl);5g酵母抽提物(yeast extract),高温高压灭菌。
YEB液体培养基,1L含量中含有:5g牛肉浸膏(beef extract);5g细菌蛋白胨(bacteriological peptone);5g蔗糖(sucrose);1g酵母抽提物(yeast extract);2mL 1M硫酸镁(MgSO4),高温高压灭菌。
1M 2-(N-吗啉)乙磺酸(MES)储备液:ddH2O溶解,过滤灭菌,-20℃储存备用。
200mM乙酰丁香酮(Acetosyringone,As)储备液:二甲基亚砜(DSMO)溶解,-20℃储存备用。
实施例1
本实施例就烟草NtCYP710A基因克隆及沉默载体的构建过程简要介绍如下。
(1)烟草NtCYP710A基因克隆
根据前期对于烟草基因组及相关NtCYP710A基因研究,选择特异编码序列为目标片段,设计PCR扩增用引物序列如下:
NtCYP710A-F:5’-TCCTCTTTGCAGCGCAAG-3’,
NtCYP710A-R:5’-CCGGAATTCTTCGCCAGC-3’。
以烟草红花大金元叶片(先提取基因组,再反转录为cDNA)的cDNA为模板,进行PCR扩增获得NtCYP710A基因;
PCR扩增程序为:95℃预变性3min;95℃变性15s,55℃退火15s,72℃延伸2min,34个循环后,72℃彻底延伸5min;
对PCR扩增产物进行琼脂糖凝胶电泳检测,并回收电泳产物备用。
(2)构建重组TRV2-NtCYP710A载体
将步骤(1)中的PCR扩增产物进行EcoRI、BamHI双酶切,同时对空载体TRV2进行EcoRI、BamHI双酶切,分别回收酶切产物,利用T4 DNA连接酶进行连接。
将连接产物转化大肠杆菌感受态DH5α,转化操作结束后将转化产物涂布在含50mg/L Kan的LB固体培养基上,37℃过培养夜。
挑选阳性单菌落扩增后进一步进行PCR鉴定,并结合测序验证,确保获得构建正确的重组载体TRV2-NtCYP710A。
实施例2
在实施例1基础上,利用农杆菌介导的VIGS技术,进一步将所构建的重组TRV2-NtCYP710A载体转化了烟草植株,并就相关植物表型变化情况做了验证分析,具体实验过程简介如下。
(1)转化农杆菌
需要说明的是,参考实施例1操作及现有技术,制备了TRV2-GFP重组载体作为对照,具体转化过程为:
将TRV2-GFP(载体对照)及TRV2-NtCYP710A的阳性克隆质粒,分别通过电击转化方式转化进入农杆菌GV3101感受态细胞中,利用含50mg/L Kan和50mg/L Rif的YEB平板进行培养筛选,在28℃倒置培养2d后,利用菌落PCR筛选带有目的基因的农杆菌。
(2)制备转染用菌液
将步骤(1)中筛选所得阳性农杆菌克隆在5mL的YEB液体培养基(含50mg/L Kan和50mg/L Rif)中,28℃、250rpm条件下培养过夜;
取50uL过夜培养物接种至50mL的YEB液体培养基(含50mg/L Kan)中,培养至OD600=1.0-1.5左右,然后4000g离心5min,收集菌体,再用MMA重悬,调节OD600=1.0左右;
最后室温放置3h左右后,作为转染用菌液。
(3)瞬时转化
以3-4w(周)苗龄的本氏烟草叶片为实验材料,利用1mL规格注射器,将步骤(2)中所制备转染用菌液注射至烟草叶片中,注射后的烟草继续在人工培养箱内培养,观察表型变化。
进一步通过qRT-PCR对NtCYP710A基因表达情况进行了检测,结果如图1所示,可以看出,TRV2-NtCYP710A的侵染植株中,NtCYP710A的表达量显著降低,qRT-PCR引物如下:
NtCYP710A-F:5’-CATGGATGTGTGGGACAGAG-3’,
NtCYP710A-R:5’-ATCCTTTGGAGCAATGGTTG-3’。
进一步地,对实验组(TRV2-NtCYP710A浸染植株)和对照组(TRV2-GFP浸染植株)中的叶片甾醇含量情况进行了检测(检测方法参照《基于气质和液质联用技术的烟草鲜烟叶代谢组学分析流程》(郑庆霞等,烟草科技,2019)),结果如图2所示。
从图2结果可以看出,实验组中总甾醇含量与对照组相比无显著变化,其中豆甾醇(stigmasterol)含量相比对照组显著下降,下降了53.4%。这进一步表明,通过沉默NtCYP710A基因,可对烟草叶片中植物豆甾醇的含量进行调控,进而可为烟叶品质调控、烟草新品种培育奠定一定技术基础。
通过转基因技术、瞬时表达技术或基因组编辑技术,构建含有NtCYP710A基因的病毒诱导沉默载体、RNAi干涉载体、超表达载体或基因组编辑载体,转化烟草,筛选获得烟叶中甾醇含量变化的烟草新品种。
以上显示和描述了本发明的基本原理和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
序列表
<110> 云南中烟工业有限责任公司
<120> 烟草细胞色素P450亚家族CYP710A基因及应用
<130> WPC211445
<141> 2021-05-25
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 1521
<212> DNA
<213> 人工序列(NtCYP710A)
<400> 1
atggcatcca tttgggtcat tctatcccca tggacacctt atttcttctc cttcatagct 60
cttctacttc ttcttgaaca gatctcttac ctgaagaaga agcgttctat tcctggtcca 120
actcttgtct tccctttcct cggcaacgtg atttctttaa tcatcaatcc caccaaattc 180
tggcaagacc aaacctcttt cgccaagtct acaggccatg gcttctgtgc taactacatc 240
atcggtaaat tcattctctt tattcactcc actgaccttt cccacaaagt ctttgccaat 300
gtccgtcctg acgctttcca gctgatcggg cacccttttg ggaaaaggct atttggtgag 360
cataacttga tttacatgtt tggtcaagaa cataaagacc atcgccgtcg aatggcccct 420
aattttaccc ctaaagctct tgctacttac actgttatcc aacaaaaaat tattatcaaa 480
cactttcagt cctggttgga cgaagcatca aaatccccta acaaaccaat cacacttcgc 540
ctcctttgtc gcgatatgaa cttggatact tctcagactg tcttcgtcgg cccatactta 600
aacgaagatt ccagaaagcg gttcaatgtt gactataatt acttcaatgt tgggttaatg 660
aaactccctg ttgatttacc cggtttcgcc ttcagagacg ctaggttagc tgttgggaga 720
ctagttgata cgctttccgt ttgtgcagca cagagccaaa ataagatgcg aggtgacgaa 780
gaacccacgt gcttaattga tttttggatg caggagtatt tcagagagat tcaggaagct 840
aagattaatg gttcacaaaa gccgttcgag tataccggca aggaacttgg tagttactta 900
tttgacttcc tctttgcggc tcaagatgct tctacttctt ctctgttatg ggcagtggtg 960
cttttggaat cccacccgca agttctggag aaagtccggt cggaagtggt gaaattctgg 1020
tcgccagaat ctgagcagcc gttgacggcg gagatgctta gggaaatgaa gtacctggaa 1080
gcggtggcgc gtgaggttgt tagaatcaga actccggcga ctttggtgcc gcacattgcc 1140
ggcgaagaat tccggttaac tgatgattat gttattccta aagggactat tgttttccct 1200
tctgtttttg actcgtcttt ccaggggttt cctgaaccgg aaaagtttga cccggaccgg 1260
tttatggagg agaggcaaga ggaacgggtt tacaagaaga actatctagc atttggagct 1320
gggtcccatg gatgtgtggg acagaggtac gctataaatc aattgatgct cttcattgcg 1380
ttgtttacgg ctctgattga tttcaagagg cacaaaacgg acggctgtga tgatatcgcg 1440
tatattccaa ccattgctcc aaaggatgat tgcaaagtgt tcctttcaca gaggtgcact 1500
cgattcccat ctttttcatg a 1521
<210> 2
<211> 506
<212> PRT
<213> 人工序列(NtCYP710A)
<400> 2
Met Ala Ser Ile Trp Val Ile Leu Ser Pro Trp Thr Pro Tyr Phe Phe
1 5 10 15
Ser Phe Ile Ala Leu Leu Leu Leu Leu Glu Gln Ile Ser Tyr Leu Lys
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Lys Lys Arg Ser Ile Pro Gly Pro Thr Leu Val Phe Pro Phe Leu Gly
35 40 45
Asn Val Ile Ser Leu Ile Ile Asn Pro Thr Lys Phe Trp Gln Asp Gln
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Thr Ser Phe Ala Lys Ser Thr Gly His Gly Phe Cys Ala Asn Tyr Ile
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Ile Gly Lys Phe Ile Leu Phe Ile His Ser Thr Asp Leu Ser His Lys
85 90 95
Val Phe Ala Asn Val Arg Pro Asp Ala Phe Gln Leu Ile Gly His Pro
100 105 110
Phe Gly Lys Arg Leu Phe Gly Glu His Asn Leu Ile Tyr Met Phe Gly
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Gln Glu His Lys Asp His Arg Arg Arg Met Ala Pro Asn Phe Thr Pro
130 135 140
Lys Ala Leu Ala Thr Tyr Thr Val Ile Gln Gln Lys Ile Ile Ile Lys
145 150 155 160
His Phe Gln Ser Trp Leu Asp Glu Ala Ser Lys Ser Pro Asn Lys Pro
165 170 175
Ile Thr Leu Arg Leu Leu Cys Arg Asp Met Asn Leu Asp Thr Ser Gln
180 185 190
Thr Val Phe Val Gly Pro Tyr Leu Asn Glu Asp Ser Arg Lys Arg Phe
195 200 205
Asn Val Asp Tyr Asn Tyr Phe Asn Val Gly Leu Met Lys Leu Pro Val
210 215 220
Asp Leu Pro Gly Phe Ala Phe Arg Asp Ala Arg Leu Ala Val Gly Arg
225 230 235 240
Leu Val Asp Thr Leu Ser Val Cys Ala Ala Gln Ser Gln Asn Lys Met
245 250 255
Arg Gly Asp Glu Glu Pro Thr Cys Leu Ile Asp Phe Trp Met Gln Glu
260 265 270
Tyr Phe Arg Glu Ile Gln Glu Ala Lys Ile Asn Gly Ser Gln Lys Pro
275 280 285
Phe Glu Tyr Thr Gly Lys Glu Leu Gly Ser Tyr Leu Phe Asp Phe Leu
290 295 300
Phe Ala Ala Gln Asp Ala Ser Thr Ser Ser Leu Leu Trp Ala Val Val
305 310 315 320
Leu Leu Glu Ser His Pro Gln Val Leu Glu Lys Val Arg Ser Glu Val
325 330 335
Val Lys Phe Trp Ser Pro Glu Ser Glu Gln Pro Leu Thr Ala Glu Met
340 345 350
Leu Arg Glu Met Lys Tyr Leu Glu Ala Val Ala Arg Glu Val Val Arg
355 360 365
Ile Arg Thr Pro Ala Thr Leu Val Pro His Ile Ala Gly Glu Glu Phe
370 375 380
Arg Leu Thr Asp Asp Tyr Val Ile Pro Lys Gly Thr Ile Val Phe Pro
385 390 395 400
Ser Val Phe Asp Ser Ser Phe Gln Gly Phe Pro Glu Pro Glu Lys Phe
405 410 415
Asp Pro Asp Arg Phe Met Glu Glu Arg Gln Glu Glu Arg Val Tyr Lys
420 425 430
Lys Asn Tyr Leu Ala Phe Gly Ala Gly Ser His Gly Cys Val Gly Gln
435 440 445
Arg Tyr Ala Ile Asn Gln Leu Met Leu Phe Ile Ala Leu Phe Thr Ala
450 455 460
Leu Ile Asp Phe Lys Arg His Lys Thr Asp Gly Cys Asp Asp Ile Ala
465 470 475 480
Tyr Ile Pro Thr Ile Ala Pro Lys Asp Asp Cys Lys Val Phe Leu Ser
485 490 495
Gln Arg Cys Thr Arg Phe Pro Ser Phe Ser
500 505
Claims (7)
1.一种烟草细胞色素P450亚家族CYP710A基因,其特征在于,核苷酸序列如SEQ IDNO.1所示。
2.根据权利要求1所述的烟草细胞色素P450亚家族CYP710A基因,其特征在于,烟草细胞色素P450亚家族CYP710A基因的编码蛋白,氨基酸序列如SEQ ID NO.2所示。
3.根据权利要求1或2所述的烟草细胞色素P450亚家族CYP710A基因,其特征在于,烟草细胞色素P450亚家族CYP710A基因的PCR扩增制备方法,包括如下步骤:
(1)提取基因组,并反转录为cDNA备用;
(2)设计PCR扩增用引物,并进行PCR扩增,具体引物序列设计如下:
NtCYP710A-F:5’-TCCTCTTTGCAGCGCAAG-3’,
NtCYP710A-R:5’-CCGGAATTCTTCGCCAGC-3’。
4.根据权利要求3所述的烟草细胞色素P450亚家族CYP710A基因,其特征在于,在步骤(1)中提取基因组时,以烟草品种红花大金元叶片为样品。
5.一种烟草细胞色素P450亚家族CYP710A基因的应用,其特征在于,利用上述权利要求1至4中任一项的烟草细胞色素P450亚家族CYP710A基因,该基因表达的蛋白与植物叶片中豆甾醇含量相关,降低该蛋白表达后,叶片中豆甾醇含量明显降低。
6.根据权利要求5所述的烟草细胞色素P450亚家族CYP710A基因的应用,其特征在于,利用基因沉默技术、或者基因超表达方法,通过调节烟草细胞色素P450亚家族CYP710A基因的表达量,来调节控制烟叶中豆甾醇含量情况。
7.根据权利要求6所述的烟草细胞色素P450亚家族CYP710A基因的应用,其特征在于,通过转基因技术、瞬时表达技术或基因组编辑技术,构建含有烟草细胞色素P450亚家族CYP710A基因的病毒诱导沉默载体、RNAi干涉载体、超表达载体或基因组编辑载体,转化烟草,筛选获得豆甾醇含量变化的烟草新品种。
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