CN113736672A - 一种能够大量表达南极假丝酵母脂肪酶b的黑曲霉重组菌株及其构建方法及应用 - Google Patents
一种能够大量表达南极假丝酵母脂肪酶b的黑曲霉重组菌株及其构建方法及应用 Download PDFInfo
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Abstract
本发明公开了高产脂肪酶B的黑曲霉重组表达菌株及其构建方法和应用。一种构建重组黑曲霉表达菌的方法,构建包含脂肪酶B的重组表达盒,该重组表达盒为包含脂肪酶B基因序列、启动子、终止子、筛选标记、上下游同源序列等元件的基因片段。按照本发明所述的方法构建的产脂肪酶B黑曲霉重组表达菌株。本发明所述的产脂肪酶B黑曲霉重组表达菌株在表达脂肪酶B中的应用。本发明通过基因工程的手段,构建了脂肪酶B的表达盒,并将其导入黑曲霉表达宿主菌,实现了脂肪酶B的高效分泌表达,获得了高产脂肪酶B表达菌株。通过对发酵条件的优化,该菌株液体发酵的上清液粗酶液表达水平可达4g/L。脂肪酶B合成性酶活可达10600unit/L。
Description
技术领域
本发明属于基因工程育种领域,涉及一种高产脂肪酶B黑曲霉重组表达菌株的构建及应用。
背景技术
脂肪酶B是一种具有双重脂类催化作用的生物催化剂。首先,脂肪酶B能够催化脂类水解,分解成醇类和脂肪酸类。其次,脂肪酶B在特定的条件下,还能够催化醇类和脂肪酸类物质脱水缩合,生成脂类。同时,在特定的条件下,它还可以催化脂类物质同相应的酸类物质或者醇类物质发生转酯化反应,生成新的脂类物质。因此,其与常规水解型脂肪酶是不同的。其被应用干酪制造、脂类改性、脂类水解,医药中间体生产,食品加工,生物柴油和润滑油生产等多种工业生产中。然而,由于其表达量相对较低,导致其价格较高,限制了其在工业界的广泛应用。因此,开发一种能够大量生产脂肪酶B的方法成为工业界的迫切需求。
脂肪酶B的生产来源主要是微生物发酵表达。然而,目前的发酵表达水平相对较低。比如,在《南极假丝酵母脂肪酶b高效表达及在选择性酰化方面的应用研究》中,表达量仅仅为0.24g/L。黑曲霉作为非常高效的工业生物发酵菌株,被用来表达一些需求量很大的工业化酶,比如糖化酶等。因此,使用黑曲霉表达脂肪酶B成为一种有潜在的高产可能性的工业化生产方法。然而,目前报道的使用黑曲霉作为宿主进行脂肪酶B表达的研究,表达量仍然很低(请参考:2019年文献《南极假丝酵母脂肪酶B在黑曲霉中的分泌表达及其硅藻土固定化应用》)。因此,发明一种能够更加高效的生产脂肪酶B的黑曲霉表达菌株,就显得尤为重要。
发明内容
本发明开发的使用黑曲霉作为宿主表达脂肪酶B的方法,以及相应的黑曲霉改造方法,实现了大量表达脂肪酶B的目标。表达量达到4g/L。合成性活性更是达到10600unit/L。
本发明提供了一种构建脂肪酶B重组黑曲霉表达菌株的方法。
本发明还提供了一种脂肪酶B重组表达载体。
本发明的目的可以通过以下技术方案实现:
一种构建重组黑曲霉表达菌的方法,构建包含脂肪酶B基因序列的重组表达盒,该重组表达盒为包含脂肪酶B基因序列、启动子、终止子、信号肽、筛选标记等元件的基因片段。
所述的脂肪酶B基因为曲霉、或青霉属来源脂肪酶B酶基因;优选为南极假丝酵母来源脂肪酶B基因;更进一步优选为具有如SEQ ID NO.1所示的核苷酸序列;所述的宿主细胞为黑曲霉。
启动子可以是黑曲霉内源启动子:如黑曲霉糖化酶启动子,中性淀粉酶启动子,酸性淀粉酶启动子,α-葡萄糖苷酶启动子等;也可以是外源启动子:如米曲霉中性淀粉酶启动子,米根酶糖化酶启动子;本发明优选黑曲霉糖化酶启动子或黑曲霉中性淀粉酶启动子。
与启动子3’末端连接的可以是调控序列:如合适的前导序列(5’UTR),即对于宿主细胞的翻译重要的mRNA非翻译区,如米曲霉中性淀粉酶和构巢曲霉丙糖磷酸异构酶前导序列。
为了分泌表达特定蛋白,需要信号肽序列介导,在黑曲霉中常用的信号肽序列有糖化酶信号肽,酸性淀粉酶信号肽,黑曲霉植酸酶信号肽,米曲霉TAKA淀粉酶信号肽,在本发明中利用的是脂肪酶B基因序列本身编码的信号肽。
优选的终止子从如下酶的基因获得:黑曲霉糖化酶、米曲霉TAKA淀粉酶、构巢曲霉邻氨基苯甲酸合酶、黑曲霉α-葡糖苷酶和尖镰孢胰蛋白酶样蛋白酶。
特定的基因在与启动子,调控序列,信号肽序列及终止子相连接后形成表达盒。通过常规方法导入到黑曲霉基因组中,可以随机插入到基因组中,也可以定点整合到某个或多个基因座上。可选的基因座有gla(糖化酶),amya(中性淀粉酶),amyb(中性淀粉酶),aa(酸性淀粉酶),agda(α葡萄糖苷酶),agdb(α葡萄糖苷酶)。
所述表达盒优选地可以与一个或多个选择性标记连接,其允许简单选择经转化、转染、转导等的细胞或菌株。选择性标记是基因,其产物提供杀生物剂或病毒抗性、对重金属的抗性、对营养缺陷型的原养性(prototrophy to auxotrophs)等。用于丝状真菌宿主细胞的选择性标记包括但不限于amdS(乙酰胺酶)、argB(鸟氨酸氨甲酰基转移酶)、bar(草铵膦)乙酰转移酶)、hyg(潮霉素磷酸转移酶)、niaD(硝酸还原酶)(nitrate reductase)、pyrG(乳清酸核苷-5’-磷酸脱羧酶)(orotidine-5’-phosphate decarboxylase)、sC(硫酸腺苷酰转移酶)和trpC(邻氨基苯甲酸合酶(anthranilate synthase)以及它们的等同物。优选用在曲霉属细胞中的是构巢曲霉(Aspergillus nidulans)或米曲霉的amdS或hyg。
所述表达盒优选地可以与一个或多个反向选择标记(负选择标记)连接。用于丝状真菌宿主细胞的选择性标记包括但不限于amdS(乙酰胺酶)、pyrG(乳清酸核苷-5’-磷酸脱羧酶),hsvTK(单纯疱疹病毒胸苷激酶)。
所述的表达盒优选核苷酸序列如SEQ ID NO.7所示。
所述的表达盒通过常规方法导入随机插入到宿主黑曲霉基因组中,或定点整合到宿主黑曲霉的某个或多个基因座上。
所述的基因座选自糖化酶gla,中性淀粉酶amya,中性淀粉酶amyb,酸性淀粉酶aa,α葡萄糖苷酶agda,α葡萄糖苷酶agdb。
所述的宿主为敲除糖化酶基因、真菌淀粉酶基因和酸性淀粉酶基因的黑曲霉。
按照本发明所述的方法构建的产脂肪酶B黑曲霉重组表达菌株。
一种重组表达载体,包含所述的含有脂肪酶B基因的表达盒。
本发明所述的产脂肪酶B黑曲霉重组表达菌株在生产脂肪酶B中的应用。
本发明的有益效果
本发明通过基因工程的手段,构建了脂肪酶B的表达盒,并将其导入黑曲霉表达宿主菌,实现了脂肪酶B的高效分泌表达,获得了高产脂肪酶B黑曲霉表达菌株。通过对发酵条件的优化,该菌株液体发酵表达水平可达10600unit/L。
附图说明
附图用来提供对本发明的进一步理解,并且构成说明书的一部分,与本发明的实施例一起用于解释本发明,并不构成对本发明的限制。在附图中:
图1:p-ZYAN01质粒图谱;
图2:p-ZYAN02-CALB质粒图谱;
图3:不同宿主表达脂肪酶B的对比,以及与其他研究的对比。
具体实施方式
以下结合附图对本发明的优选实施例进行说明,应当理解,此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明。
实施例1:p-ZYAN02-CALB质粒的构建
制备该质粒主要包含以下两个步骤:1.制备中间质粒p-ZYAN01。2.线性化中间质粒p-ZYAN01,并将脂肪酶B基因表达盒及上下游同源片段整合进p-ZYAN01,组成p-ZYAN02-CALB质粒
制备中间质粒p-ZYAN01方法如下:
p-ZYAN01主要由如下几部分及必须的连接序列结合而成,或者由以下几部分直接结合而成。
(1)pUC57质粒XbaI-PscI双酶切后得到的2305bp片段;
(2)hyg基因表达盒,序列见SEQ ID NO.3;
(3)amds表达盒,序列见SEQ ID NO.4。
将pUC57质粒XbaI-PciI双酶切后得到的2305bp片段,hyg基因表达盒,以及amds表达盒,三个基因片段序列片段通过Gibson Master Mix Kit(E2611,New England Biolabs)进行重组,得到重组质粒p-ZYAN01(图1)。将脂肪酶B表达盒整合到黑曲霉糖化酶基因座以进行表达,使用糖化酶启动子和糖化酶终止子。构建脂肪酶B整合表达质粒p-ZYAN02-CALB。整合质粒构建方法如下:将p-ZYAN01质粒通过业界通用的方法进行线性化;以黑曲霉基因片段SEQ ID NO.5为5’端同源片段,以黑曲霉基因片段SEQ ID NO.6为3’端同源片段,每个片段长2000bp。将上述线性化的p-ZYAN01载体、同源片段和脂肪酶B表达盒片段通过GibsonMaster Mix Kit(E2611,New England Biolabs)进行重组,得到整合质粒p-ZYAN02-CALB,该整合质粒包含脂肪酶B表达盒,该表达盒包含了黑曲霉糖化酶启动子序列,南极假丝酵母来源的脂肪酶B序列以及黑曲霉糖化酶终止子序列,经测序确认序列,质粒图谱见图示2。
实施例2:脂肪酶B表达盒的转化整合
本实施例出发菌株为ZYAN05,是由常规菌株经敲除糖化酶基因、真菌淀粉酶基因和酸性淀粉酶基因后获得的。黑曲霉中上述基因敲除/敲入方法可参考专利C N103937766A或CN 104962594A实施例中公开的技术方法实现。即参照Delmas(Appl EnvironMicrobiol.2014,80(11):3484-7)等人描述的方法。具体地,利用环状DNA载体,包含有上述5’及3’同源序列,选择标记,以及大肠杆菌复制序列。将环状载体转入到黑曲霉中,通过选择获得重组菌株。
采用原生质体转化法将p-ZYAN02-CALB质粒导入黑曲霉菌株ZYAN05,具体操作步骤如下:原生质体的制备:在营养丰富的TZ液体培养基(牛肉膏粉0.8%;酵母浸膏0.2%;蛋白胨0.5%;NaCl 0.2%;蔗糖3%;pH5.8)中培养黑曲霉菌丝体。通过mira-cloth(Calbiochem公司)从培养液中过滤菌丝体并用0.7M NaCl(pH5.8)洗涤,菌丝体滤干后转移至含纤维素酶1%(Sigma)、蜗牛酶1%(Sigma)和溶壁酶(Sigma)0.2%的酶解液(pH5.8)中,30℃,65rpm酶解3h。然后将含有原生质体的酶解液置于冰上并用四层擦镜纸过滤,得到的滤液经3000rpm,4℃温和离心10min后,弃上清;附着在管壁上的原生质体用STC溶液(1MDSorbitol、50mM CaCl2、10mM Tris,pH7.5)洗涤一次,最后把原生质体重悬于适量的STC溶液中。
将环状p-ZYAN02-CALB质粒10μl(浓度为:100ng/μl)加入到100μl原生质体悬浮液中混匀后室温放置25min;然后分3次共加入900μl PEG溶液,混匀后室温放置25min;3000rpm,常温离心10min,弃上清,原生质体附着于管壁上,将其重悬于1ml STC溶液中。把该悬浮液与预先降温至45℃左右的培养基(乙酰胺0.3%、蔗糖20%、琼脂0.7%)混合并铺平板;待平板凝固后放入34℃培养箱中培养;24h后在平板上再铺一层含300ng/μl潮霉素(Hygromycin)的固体培养基(琼脂1%,其余成分同上),继续将平板置于34℃培养箱中培养4-5天后,长出上层培养基的转化子称为整合转化子。随机挑取几个整合转化子分别传代于含300ng/μl潮霉素(Hygromycin)的固体培养基上,34℃恒温培养3天后,收集菌丝体用液氮冷冻后研磨粉碎,然后用真菌基因组提取试剂盒(杭州博日科技有限公司)提取整合转化子基因组DNA,最后对整合转化子基因组DNA进行PCR鉴定。PCR产物经测序后确认整合到糖化酶基因座。阳性转化子经PCR产物测序后确认后得到重组表达菌株。
实施例4重组表达菌种液体发酵生产脂肪酶B
斜面培养:将所述黑曲霉重组表达菌株取一接种环菌苔接种于PDA固体斜面,35℃下恒温培养60h;摇瓶培养:将斜面培养得到的菌株取一接种环菌苔接入种子培养基中,在初始pH5.5、35℃、摇床转速200rpm条件下培养72h左右。下表是250ml摇瓶3批次的发酵产酶情况,平均产酶水平为合成性酶活10600unit/L,上清液粗蛋白量4g/L。
批次 | 发酵周期(h) | 发酵酶活(unit/L) | 粗蛋白量(g/L) |
1 | 72 | 9995 | 3.8g/L |
2 | 78 | 12030 | 4.4g/L |
3 | 75 | 9775 | 3.8g/L |
所述斜面培养基如下:蔗糖20g,NaNO3 2g,MgSO4 0.5g,KCl 0.5g,FeSO4 0.01g,K2HPO4 1g,琼脂20g,将上述各组分溶于1000mL水中,调节pH至5.5,121℃灭菌20min,备用。
所述摇瓶种子培养基如下:麦芽汁200mL,豆饼粉5g,调节pH至5.5,121℃灭菌20min,备用。
同时,使用未改造的黑曲霉菌种进行同样的摇瓶培养,取上清液进行检测,未检测到脂肪酶B合成性酶活。使用两种菌种的上清液进行SDS-PAGE测试(测试方法为行业通用的常规方法),经改造的黑曲霉菌种的发酵上清液产生出大量的脂肪酶B(图示3A,箭头所示)。而相应的,未改造的黑曲霉脂肪酶B菌种没有产生能检测到的脂肪酶B蛋白条带。同时,对照研究(《南极假丝酵母脂肪酶B在黑曲霉中的分泌表达及其硅藻土固定化应用》)的SDS-PAGE中脂肪酶B条带显示,其表达量远远低于本发明的表达量,如图示3B所示,图3B摘引自文章:南极假丝酵母脂肪酶B在黑曲霉中的分泌表达及其硅藻土固定化应用。作者:张玲敏,王斌,潘力。DOI:10.7506/spkx1002-6630-20180917-178)。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
序列表
<110> 南京正扬生物科技有限公司
<120> 一种能够大量表达南极假丝酵母脂肪酶B的黑曲霉重组菌株及其构建方法及应用
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cctttcagag gccgaactga agatcacaga ggcctccgct gcagatcttg tgtccaagct 840
ggcggccgga gagttgacct cggtggaagt tacgctagca ttctgtaaac gggcagcaat 900
cgcccagcag ttagtagggt cccctctacc tctcagggag atgtaacaac gccaccttat 960
gggactatca agctgacgct ggcttctgtg cagacaaact gcgcccacga gttcttccct 1020
gacgccgctc tcgcgcaggc aagggaactc gatgaatact acgcaaagca caagagaccc 1080
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cgttgcccct aagtcgttag atgtcccttt ttgtcagcta acatatgcca ccagggctac 1200
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acaaccatgc tccgcaaagc cggtgccgtc ttctacgtca agacctctgt cccgcagacc 1320
ctgatggtct gcgagacagt caacaacatc atcgggcgca ccgtcaaccc acgcaacaag 1380
aactggtcgt gcggcggcag ttctggtggt gagggtgcga tcgttgggat tcgtggtggc 1440
gtcatcggtg taggaacgga tatcggtggc tcgattcgag tgccggccgc gttcaacttc 1500
ctgtacggtc taaggccgag tcatgggcgg ctgccgtatg caaagatggc gaacagcatg 1560
gagggtcagg agacggtgca cagcgttgtc gggccgatta cgcactctgt tgagggtgag 1620
tccttcgcct cttccttctt ttcctgctct ataccaggcc tccactgtcc tcctttcttg 1680
ctttttatac tatatacgag accggcagtc actgatgaag tatgttagac ctccgcctct 1740
tcaccaaatc cgtcctcggt caggagccat ggaaatacga ctccaaggtc atccccatgc 1800
cctggcgcca gtccgagtcg gacattattg cctccaagat caagaacggc gggctcaata 1860
tcggctacta caacttcgac ggcaatgtcc ttccacaccc tcctatcctg cgcggcgtgg 1920
aaaccaccgt cgccgcactc gccaaagccg gtcacaccgt gaccccgtgg acgccataca 1980
agcacgattt cggccacgat ctcatctccc atatctacgc ggctgacggc agcgccgacg 2040
taatgcgcga tatcagtgca tccggcgagc cggcgattcc aaatatcaaa gacctactga 2100
acccgaacat caaagctgtt aacatgaacg agctctggga cacgcatctc cagaagtgga 2160
attaccagat ggagtacctt gagaaatggc gggaggctga agaaaaggcc gggaaggaac 2220
tggacgccat catcgcgccg attacgccta ccgctgcggt acggcatgac cagttccggt 2280
actatgggta tgcctctgtg atcaacctgc tggatttcac gagcgtggtt gttccggtta 2340
cctttgcgga taagaacatc gataagaaga atgagagttt caaggcggtt agtgagcttg 2400
atgccctcgt gcaggaagag tatgatccgg aggcgtacca tggggcaccg gttgcagtgc 2460
aggttatcgg acggagactc agtgaagaga ggacgttggc gattgcagag gaagtgggga 2520
agttgctggg aaatgtggtg actccatagc taataagtgt cagatagcaa tttgcacaag 2580
aaatcaatac cagcaactgt aaataagcgc tgaagtgacc atgccatgct acgaaagagc 2640
agaaaaaaac ctgccgtaga accgaagaga tatgacacgc ttccatctct caaaggaaga 2700
atcccttcag ggttgcgttt ccag 2724
<210> 5
<211> 2000
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 5
ctaccaatgc tctcgaggat tgcctgaaca ttgacattcg gcgtccggcc gggaccaccg 60
cggactcgaa gctgcctgtg ctggtctgga tctttggcgg aggctttgaa cttggttcaa 120
aggcgatgta tgatggtaca acgatggtat catcgtcgat agacaagaac atgcctatcg 180
tgtttgtagc aatgaattat cgcgtgggag gtttcgggtt cttgcccgga aaggagatcc 240
tggaggacgg gtccgcgaac ctagggctcc tggaccaacg ccttgccctg cagtgggttg 300
ccgacaacat cgaggccttt ggtggagacc cggacaaggt gacgatttgg ggagaatcag 360
caggagccat ttccgttttt gatcagatga tcttgtacga cggaaacatc acttacaagg 420
ataagccctt gttccggggg gccatcatgg actccggtag tgttgttccc gcagaccccg 480
tcgatggggt caagggacag caagtatatg atgcggtagt ggaatctgca ggctgttcct 540
cttctaacga caccctagct tgtctgcgtg aactagacta caccgacttc ctcaatgcgg 600
caaactccgt gccaggcatt ttaagctacc attctgtggc gttatcatat gtgcctcgac 660
cggacgggac ggcgttgtcg gcatcaccgg acgttttggg caaagcaggg aaatatgctc 720
gggtcccgtt catcgtgggc gaccaagagg atgaggggac cttattcgcc ttgtttcagt 780
ccaacattac gacgatcgac gaggtggtcg actacctggc ctcatacttc ttctatgacg 840
ctagccgaga gcagcttgaa gaactagtgg ccctgtaccc agacaccacc acgtacgggt 900
ctccgttcag gacaggcgcg gccaacaact ggtatccgca atttaagcga ttggccgcca 960
ttctcggcga cttggtcttc accattaccc ggcgggcatt cctctcgtat gcagaggaaa 1020
tctcccctga tcttccgaac tggtcgtacc tggcgaccta tgactatggc accccagttc 1080
tggggacctt ccacggaagt gacctgctgc aggtgttcta tgggatcaag ccaaactatg 1140
cagctagttc tagccacacg tactatctga gctttgtgta tacgctggat ccgaactcca 1200
accgggggga gtacattgag tggccgcagt ggaaggaatc gcggcagttg atgaatttcg 1260
gagcgaacga cgccagtctc cttacggatg atttccgcaa cgggacatat gagttcatcc 1320
tgcagaatac cgcggcgttc cacatctgat gccattggcg gaggggtccg gacggtcagg 1380
aacttagcct tatgagatga atgatggacg tgtctggcct cggaaaagga tatatgggga 1440
tcatgatagt actagccata ttaatgaagg gcatatacca cgcgttggac ctgcgttata 1500
gcttcccgtt agttatagta ccatcgttat accagccaat caagtcacca cgcacgaccg 1560
gggacggcga atccccggga attgaaagaa attgcatccc aggccagtga ggccagcgat 1620
tggccacctc tccaaggcac agggccattc tgcagcgctg gtggattcat cgcaatttcc 1680
cccggcccgg cccgacaccg ctataggctg gttctcccac accatcggag attcgtcgcc 1740
taatgtctcg tccgttcaca agctgaagag cttgaagtgg cgagatgtct ctgcaggaat 1800
tcaagctaga tgctaagcga tattgcatgg caatatgtgt tgatgcatgt gcttcttcct 1860
tcagcttccc ctcgtgcaga tgaggtttgg ctataaattg aagtggttgg tcggggttcc 1920
gtgaggggct gaagtgcttc ctccctttta gacgcaactg agagcctgag cttcatcccc 1980
agcatcatta cacctcagca 2000
<210> 6
<211> 2000
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 6
acaatcaatc catttcgcta tagttaaagg atggggatga gggcaattgg ttatatgatc 60
atgtatgtag tgggtgtgca taatagtagt gaaatggaag ccaagtcatg tgattgtaat 120
cgaccgacgg aattgaggat atccggaaat acagacaccg tgaaagccat ggtctttcct 180
tcgtgtagaa gaccagacag acagtccctg atttaccctt gcacaaagca ctagaaaatt 240
agcattccat ccttctctgc ttgctctgct gatatcactg tcattcaatg catagccatg 300
agctcatctt agatccaagc acgtaattcc atagccgagg tccacagtgg agcagcaaca 360
ttccccatca ttgctttccc caggggcctc ccaacgacta aatcaagagt atatctctac 420
cgtccaatag atcgtcttcg cttcaaaatc tttgacaatt ccaagagggt ccccatccat 480
caaacccagt tcaataatag ccgagatgca tggtggagtc aattaggcag tattgctgga 540
atgtcggggc cagttggccc ggtggtcatt ggccgcctgt gatgccatct gccactaaat 600
ccgatcattg atccaccgcc cacgaggcgc gtctttgctt tttgcgcggc gtccaggttc 660
aactctctct gcagctccag tccaacgctg actgactagt ttacctactg gtctgatcgg 720
ctccatcaga gctatggcgt tatcccgtgc cgttgctgcg caatcgctat cttgatcgca 780
accttgaact cactcttgtt ttaatagtga tcttggtgac ggagtgtcgg tgagtgacaa 840
ccaacatcgt gcaagggaga ttgatacgga attgtcgctc ccatcatgat gttcttgccg 900
gctttgttgg ccctattcgt gggatgcgat gccctcgctg tgcagcagca ggtactgctg 960
gatgaggagc catcggtctc tgcacgcaaa cccaacttcc tcttcattct cacggatgat 1020
caggatctcc ggatgaattc tccggcgtat atgccgtata cgcaggcgag aatcaaggaa 1080
aagggtaccg agttcttgaa ccatttcgtc actaccgcgc tttgctgtcc gtcgcgcgtg 1140
agtctttgga cgggaagaca ggctcataat actaatgtga cggatgtgaa cccgccttat 1200
ggtatggaca ctgcttcgat cggtcttgat tcttcagcgt ggttacaatt gctaatgcgg 1260
cataggcgga taccccaaat tcgtcgctca aggcttcaac gaaaacttcc tccccgtttg 1320
gctgcagtcc gccggttaca atacctacta cacggggaag ctgttcaact cgcacagtgt 1380
cgctacctat aacgcgccct ttgtgaacgg tttcaatggc tccgacttcc tcctcgaccc 1440
ccacacatat tcctactgga atgcgacata ccagcgaaac catgagcctc cgcggagtta 1500
cgagggacaa tatactacgg atgtgatgaa ggagaaggca tcgggattgt tggcagatgc 1560
gctggacagt gacgcgccat tcttcctgac ggtcgcgccg atcgcaccgc acacgaacat 1620
cgatgtggag gggctgagcg gtgcgggtgg accgaagatg acagagccgc tgcctgcacc 1680
gagacatgcg catttgtttg ctgatgcaaa ggtgccgcgg acgcctaatt tcaatccgga 1740
caaggtgtgt gatatcctga cacagtggtg gggacgggca ctgacaagag taggattctg 1800
gtgcggggtg gatccaaacc atggaactac agaaccagac cgtcatcgac tacgaagacc 1860
atctttatcg ccagcgtctg cgcactttgc aagccgtcga tgagatggtg gatgcgctga 1920
tcacgcagct ggaagaaagt gggcagatcg acaataccta catcatttac agtgctgata 1980
acggctacca cattggccat 2000
<210> 7
<211> 1961
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 7
taaattttta tatggcgggt ggtgggcaac tcgcttgcgc gggcaactcg cttaccgatt 60
acgttagggc tgatatttac gtaaaaatcg tcaagggatg caagaccaaa ccgttaaatt 120
tccggagtca acagcatcca agcccaagtc cttcacggag aaaccccagc gtccacatca 180
cgagcgaagg accacctcta ggcatcggac gcaccatcca attagaagca gcaaagcgaa 240
acagcccaag aaaaaggtcg gcccgtcggc cttttctgca acgctgatca cgggcagcga 300
tccaaccaac accctccaga gtgactaggg gcggaaattt atcgggatta atttccactc 360
aaccacaaat cacagtcgtc cccggtattg tcctgcagac ggcaatttaa cggcttctgc 420
gaatcgcttg gattccccgc ccctggccgt agagcttaaa gtatgtccct tgtcgatgcg 480
atgtatcaca acatataaat actggcaagg gatgccatgc ttggagtttc caactcaatt 540
tacctctatc cacacttctc ttccttcctc aatcctctat atacacaact ggggatctcc 600
accatgaagc tgctgagcct gaccggtgtg gcgggcgttc tggcgacctg cgttgcggcg 660
accccgctgg ttaaacgtct gccgagcggt agcgacccgg cgttcagcca gccgaaaagc 720
gtgctggatg cgggtctgac ctgccaaggt gcgagcccga gcagcgtgag caaaccgatt 780
ctgctggttc cgggtaccgg taccaccggt ccgcagagct tcgacagcaa ctggattccg 840
ctgagcaccc aactgggcta caccccgtgc tggattagcc cgccgccgtt tatgctgaac 900
gatacccagg tgaacaccga gtacatggtt aacgcgatca ccgcgctgta tgcgggtagc 960
ggcaacaaca agctgccggt gctgacctgg agccagggtg gcctggttgc gcaatggggt 1020
ctgaccttct ttccgagcat tcgtagcaag gtggaccgtc tgatggcgtt cgcgccggat 1080
tataaaggta ccgttctggc gggtccgctg gatgcgctgg cggtgagcgc gccgagcgtt 1140
tggcagcaaa ccaccggcag cgcgctgacc accgcgctgc gtaacgcggg tggcctgacc 1200
cagattgtgc cgaccaccaa cctgtacagc gcgaccgacg aaattgtgca gccgcaagtt 1260
agcaacagcc cgctggatag cagctacctg ttcaacggca agaacgtgca ggcgcaagcg 1320
gtttgcggtc cgctgttcgt tatcgatcac gcgggcagcc tgaccagcca gtttagctac 1380
gtggttggcc gtagcgcgct gcgtagcacc accggtcaag cgcgtagcgc ggactatggc 1440
attaccgatt gcaacccgct gccggcgaac gacctgaccc cggagcagaa agtggctgcg 1500
gcggcgctgc tggcgccggc tgcggcggcg atcgttgcgg gtccgaagca aaactgcgaa 1560
ccggatctga tgccgtacgc gcgtccgttt gcggtgggta aacgtacctg cagcggcatt 1620
gttaccccgt aactcgagat ctagagggtg actgacacct ggcggtagac aatcaatcca 1680
tttcgctata gttaaaggat ggggatgagg gcaattggtt atatgatcat gtatgtagtg 1740
ggtgtgcata atagtagtga aatggaagcc aagtcatgtg attgtaatcg accgacggaa 1800
ttgaggatat ccggaaatac agacaccgtg aaagccatgg tctttccttc gtgtagaaga 1860
ccagacagac agtccctgat ttacccttgc acaaagcact agaaaattag cattccatcc 1920
ttctctgctt gctctgctga tatcactgtc attcaatgca t 1961
Claims (11)
1.一种产脂肪酶B的黑曲霉重组表达菌株的构建方法,其特征在于以黑曲霉为宿主细胞,将含有脂肪酶B基因的表达盒导入到宿主细胞得到;所述的脂肪酶B基因选自曲霉、酵母或毛霉属来源的脂肪酶B基因。
2.根据权利要求1所述的构建方法,其特征在于,所述的脂肪酶B基因,为南极假丝酵母来源,其序列如SEQ ID NO.1所示。以及与SEQ ID NO.1同源性达到90%及以上的其他序列。
3.根据权利要求1所述的构建方法,其特征在于所述的表达盒为包含脂肪酶B基因序列、启动子、与启动子3’末端连接的调控序列、终止子、筛选标记和上下游同源序列的基因片段。
4.根据权利要求3所述的构建方法,其特征在于所述的启动子选自黑曲霉内源启动子或外源启动子;所述的黑曲霉内源启动子为黑曲霉糖化酶启动子,中性淀粉酶启动子,酸性淀粉酶启动子或α-葡萄糖苷酶启动子;所述的外源启动子为米曲霉中性淀粉酶启动子或米根酶糖化酶启动子;所述的启动子3’末端连接的调控序列为前导序列5’UT。
5.根据权利要求1所述的构建方法,其特征在于所述的表达盒还包含信号肽序列,所述的信号肽序列选自有糖化酶信号肽、酸性淀粉酶信号肽、黑曲霉植酸酶信号肽或米曲霉TAKA淀粉酶信号肽,优选脂肪酶B基因序列本身编码的信号肽,如SEQ ID NO.2所示,以及与SEQ ID NO.2同源性达到95%及以上的其他序列。
6.根据权利要求1所述的构建方法,其特征在于所述的终止子从如下酶的基因中获得:黑曲霉糖化酶、米曲霉TAKA淀粉酶、构巢曲霉邻氨基苯甲酸合酶、黑曲霉α-葡糖苷酶或尖镰孢胰蛋白酶样蛋白酶。
7.根据权利要3所述的构建方法,其特征在于所述的筛选标记元件选自选择性标记和/或反向选择标记;所述的选择性标记选自乙酰胺酶amdS、鸟氨酸氨甲酰基转移酶argB、草铵膦bar、乙酰转移酶、潮霉素磷酸转移酶hyg、硝酸还原酶niaD、乳清酸核苷-5’-磷酸脱羧酶pyrG、硫酸腺苷酰转移酶sC、邻氨基苯甲酸合酶trpC或它们的等同物,优选用在曲霉属细胞中的是构巢曲霉或米曲霉的amdS、hyg;所述的反向选择标记选自丝状真菌宿主细胞的选择性标记或hsvTK,优选乙酰胺酶amdS、乳清酸核苷-5’-磷酸脱羧酶pyrG。
8.根据权利要求1-8中任一项所述的构建方法,其特征在于所述的脂肪酶B基因的表达盒核苷酸序列如SEQ ID NO.7所示,以及与SEQ ID NO.7同源性达到95%及以上的其他序列。
9.根据权利要求1和要求3所述的构建方法,其特征在于所述的表达盒通过常规方法导入,随机插入到宿主黑曲霉基因组中,或定点整合到宿主黑曲霉的某个或多个基因座上。所述的基因座选自糖化酶gla,中性淀粉酶amya,中性淀粉酶amyb,酸性淀粉酶aa,α葡萄糖苷酶agda或α葡萄糖苷酶agdb中的任意一张。
10.根据权利要1所述的构建方法,其特征在于所述的宿主为敲除糖化酶基因、真菌淀粉酶基因和酸性淀粉酶基因的黑曲霉。
11.按照权利要求1-10中任一项所述的方法构建的产脂肪酶B黑曲霉重组表达菌株。
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