CN105969712B - 一种共表达分子伴侣蛋白提高重组大肠杆菌1,2,4-丁三醇产量的方法 - Google Patents

一种共表达分子伴侣蛋白提高重组大肠杆菌1,2,4-丁三醇产量的方法 Download PDF

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CN105969712B
CN105969712B CN201610316953.8A CN201610316953A CN105969712B CN 105969712 B CN105969712 B CN 105969712B CN 201610316953 A CN201610316953 A CN 201610316953A CN 105969712 B CN105969712 B CN 105969712B
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诸葛斌
何姝颖
陆信曜
宗红
陈雯
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Abstract

本发明公开了一种共表达分子伴侣蛋白提高重组大肠杆菌中1,2,4‑丁三醇产量的方法,属于遗传工程领域。本发明是以重组大肠杆菌E.coli(pEtac‑mdlC‑tac‑xdh)作为出发菌株,通过共表达分子伴侣蛋白,辅助1,2,4‑丁三醇合成途径中关键酶的折叠,增强关键酶活性,从而提高1,2,4‑丁三醇产量的方法。最后优选分子伴侣Trigger factor,使重组大肠杆菌1,2,4‑丁三醇产量提高了1.4倍。

Description

一种共表达分子伴侣蛋白提高重组大肠杆菌1,2,4-丁三醇产 量的方法
技术领域
本发明涉及一种共表达分子伴侣蛋白提高重组大肠杆菌中1,2,4-丁三醇的方法,属于遗传工程领域。
技术背景
1,2,4-丁三醇是一种四碳多元醇,无色,无臭,无味,性质与甘油类似,主要应用于军工、医药、化妆品、化工等领域。目前,1,2,4-丁三醇主要通过化学法生产,但化学法存在着反应条件严苛,所用催化剂昂贵,易造成环境污染、副产物较多,不利于分离纯化的弊端,故近年来,研究的焦点逐渐转向生物合成法。
迄今为止,尚未在生物体内发现1,2,4-丁三醇,故生物法合成丁三醇是通过引进外源蛋白,构建合成路径。目前已在大肠杆菌中构建成功且研究较多的合成途径为:从木糖出发,在木糖脱氢酶作用下,生成木糖酸,木糖酸经木糖酸脱水酶,苯甲酰甲酸脱羧酶及醇脱氢酶的作用,生成1,2,4-丁三醇。但该方法产量仍未达到工业生产的要求,主要是由于关键代谢酶催化活性低下。因此,提高关键代谢酶活性是提高1,2,4-丁三醇产量的关键。
分子伴侣蛋白(chaperone)是一类蛋白,他们可以介导蛋白质的正确装配,但并不作为蛋白的组成部分。目前常见于大肠杆菌中的分子伴侣蛋白有三种:GroES-GroEL、DnaK-DnaJ-GrpE和Trigger factor。其中,GroEL属于Hsp60伴侣家族,GroES为其辅助分子伴侣,两者在ATP的共同作用下可以与未折叠或部分折叠的多肽结合,释放未折叠的多肽进入折叠池,以及对折叠好的蛋白进行结构重排。DnaK、DnaJ均属于Hsp70家族,主要功能包括辅助体内蛋白质折叠以及跨膜转运、降解以及调节异常蛋白质。GrpE作为二者的辅助因子,可以辅助正确折叠蛋白的释放。Trigger factor是一个三亚基蛋白,可以与新生肽链结合,辅助蛋白折叠。另外,不同的伴侣蛋白间也存在协同作用。在大肠杆菌中共表达分子伴侣蛋白可以辅助外源蛋白的折叠,提高目的蛋白酶活水平,如trigger factor的引入促进小鼠内皮抑制素、人体氧调节蛋白的溶解程度。在本研究中,引入分子伴侣蛋白,可能提高代谢酶活性,从而提升1,2,4-丁三醇产量。
发明内容
本发明首先提供五种共表达分子伴侣蛋白的重组大肠杆菌,是以E.coli(pEtac-mdlC-tac-xdh)为出发菌株,分别转入含有分子伴侣蛋白基因的质粒pG-KJE8、pGro7、pTf16、pKJE7、pG-Tf2,构建而成的重组大肠杆菌E.coli(pEtac-mdlC-tac-xdh)/pG-KJE8,E.coli(pEtac-mdlC-tac-xdh)/pGro7,E.coli(pEtac-mdlC-tac-xdh)/pTf16,E.coli(pEtac-mdlC-tac-xdh)/pKJE7,E.coli(pEtac-mdlC-tac-xdh)/pG-Tf2。
其中,所述E.coli(pEtac-mdlC-tac-xdh),是以E.coli W3100为宿主,以启动子Ptac调控Xdh、MdlC表达,具体构建方法参见文献(孙文龙,陆信曜,宗红,等.代谢工程改造大肠杆菌合成D-1,2,4-丁三醇[J].微生物学通报,2014,41(10))。
本发明所述质粒pG-KJE8、pGro7、pTf16、pKJE7、pG-Tf2含有不同分子伴侣蛋白基因,其中,pG-KJE8含有DnaK-DnaJ-GrpE及GroES-GroEL编码基因,pG-Tf2携带Triggerfactor及GroES-GroEL,而质粒pGro7、pTf16、pKJE7则分别带有GroES-GroEL、Triggerfactor、DnaK-DnaJ-GrpE蛋白。
所述DnaK编码基因如NCBI-Gene ID:944750所示,DnaJ编码基因如NCBI-Gene ID:944753所示,GrpE基因如NCBI-Gene ID:947097所示。所述GroES编码基因如NCBI-Gene ID:948655所示,GroEL编码基因如NCBI-Gene ID:948665所示,tig基因如NCBI-Gene ID:945081所示。
分子伴侣蛋白氨基酸序列如下:
GroES:
MNIRPLHDRVIVKRKEVETKSAGGIVLTGSAAAKSTRGEVLAVGNGRILENGEVKPLDVKVGDIVIFNDGYGVKSEKIDNEEVLIMSESDILAIVEA
GroEL:
MAAKDVKFGNDARVKMLRGVNVLADAVKVTLGPKGRNVVLDKSFGAPTITKDGVSVAREIELEDKFENMGAQMVKEVASKANDAAGDGTTTATVLAQAIITEGLKAVAAGMNPMDLKRGIDKAVTAAVEELKALSVPCSDSKAIAQVGTISANSDETVGKLIAEAMDKVGKEGVITVEDGTGLQDELDVVEGMQFDRGYLSPYFINKPETGAVELESPFILLADKKISNIREMLPVLEAVAKAGKPLLIIAEDVEGEALATLVVNTMRGIVKVAAVKAPGFGDRRKAMLQDIATLTGGTVISEEIGMELEKATLEDLGQAKRVVINKDTTTIIDGVGEEAAIQGRVAQIRQQIEEATSDYDREKLQERVAKLAGGVAVIKVGAATEVEMKEKKARVEDALHATRAAVEEGVVAGGGVALIRVASKLADLRGQNEDQNVGIKVALRAMEAPLRQIVLNCGEEPSVVANTVKGGDGNYGYNAATEEYGNMIDMGILDPTKVTRSALQYAASVAGLMITTECMVTDLPKNDAADLGAAGGMGGMGGMGGMM
DnaK:
MGKIIGIDLGTTNSCVAIMDGTTPRVLENAEGDRTTPSIIAYTQDGETLVGQPAKRQAVTNPQNTLFAIKRLIGRRFQDEEVQRDVSIMPFKIIAADNGDAWVEVKGQKMAPPQISAEVLKKMKKTAEDYLGEPVTEAVITVPAYFNDAQRQATKDAGRIAGLEVKRIINEPTAAALAYGLDKGTGNRTIAVYDLGGGTFDISIIEIDEVDGEKTFEVLATNGDTHLGGEDFDSRLINYLVEEFKKDQGIDLRNDPLAMQRLKEAAEKAKIELSSAQQTDVNLPYITADATGPKHMNIKVTRAKLESLVEDLVNRSIEPLKVALQDAGLSVSDIDDVILVGGQTRMPMVQKKVAEFFGKEPRKDVNPDEAVAIGAAVQGGVLTGDVKDVLLLDVTPLSLGIETMGGVMTTLIAKNTTIPTKHSQVFSTAEDNQSAVTIHVLQGERKRAADNKSLGQFNLDGINPAPRGMPQIEVTFDIDADGILHVSAKDKNSGKEQKITIKASSGLNEDEIQKMVRDAEANAEADRKFEELVQTRNQGDHLLHSTRKQVEEAGDKLPADDKTAIESALTALETALKGEDKAAIEAKMQELAQVSQKLMEIAQQQHAQQQTAGADASANNAKDDDVVDAFEEVKDKK
DnaJ:
MAKQDYYEILGVSKTAEEREIRKAYKRLAMKYHPDRNQGDKEAEAKFKEIKEAYEVLTDSQKRAAYDQYGHAAFEQGGMGGGGFGGGADFSDIFGDVFGDIFGGGRGRQRAARGADLRYNMELTLEEAVRGVTKEIRIPTLEECDVCHGSGAKPGTQPQTCPTCHGSGQVQMRQGFFAVQQTCPHCQGRGTLIKDPCNKCHGHGRVERSKTLSVKIPAGVDTGDRIRLAGEGEAGEHGAPAGDLYVQVQVKQHPIFEREGNNLYCEVPINFAMAALGGEIEVPTLDGRVKLKVPGETQTGKLFRMRGKGVKSVRGGAQGDLLCRVVVETPVGLNERQKQLLQELQESFGGPTGEHNSPRSKSFFDGVKKFFDDLTR
GrpE:
MSSKEQKTPEGQAPEEIIMDQHEEIEAVEPEASAEQVDPRDEKVANLEAQLAEAQTRERDGILRVKAEMENLRRRTELDIEKAHKFALEKFINELLPVIDSLDRALEVADKANPDMSAMVEGIELTLKSMLDVVRKFGVEVIAETNVPLDPNVHQAIAMVESDDVAPGNVLGIMQKGYTLNGRTIRAAMVTVAKAKA
Trigger factor:
MQVSVETTQGLGRRVTITIAADSIETAVKSELVNVAKKVRIDGFRKGKVPMNIVAQRYGASVRQDVLGDLMSRNFIDAIIKEKINPAGAPTYVPGEYKLGEDFTYSVEFEVYPEVELQGLEAIEVEKPIVEVTDADVDGMLDTLRKQQATWKEKDGAVEAEDRVTIDFTGSVDGEEFEGGKASDFVLAMGQGRMIPGFEDGIKGHKAGEEFTIDVTFPEEYHAENLKGKAAKFAINLKKVEERELPELTAEFIKRFGVEDGSVEGLRAEVRKNMERELKSAIRNRVKSQAIEGLVKANDIDVPAALIDSEIDVLRRQAAQRFGGNEKQALELPRELFEEQAKRRVVVGLLLGEVIRTNELKADEERVKGLIEEMASAYEDPKEVIEFYSKNKELMDNMRNVALEEQAVEAVLAKAKVTEKETTFNELMNQQA
本发明还提供了应用所述重组大肠杆菌发酵生产1,2,4-丁三醇的方法,将37℃、200rpm下培养12h的重组大肠杆菌以1%的接种量转入发酵培养基,同时根据需要加入2mg/mL阿拉伯糖,10ng/mL四环素,0.5mmol/L IPTG,在37℃、200rpm下培养50h。
重组大肠杆菌种子培养及发酵:
种子培养基(g/L):胰蛋白胨10,酵母粉5,NaCl 10。
发酵培养基(g/L):胰蛋白胨10,酵母粉5,NaCl 10,木糖20。
培养条件:将37℃、200rpm下培养12h的种子以1%的接种量转入发酵培养基,于37℃、200rpm条件下培养50h。
本发明是以重组大肠杆菌E.coli(pEtac-mdlC-tac-xdh)作为出发菌株,通过共表达分子伴侣蛋白提高关键代谢酶的折叠效率,进而提高关键酶催化活性,从而提高1,2,4-丁三醇的产量。在摇瓶发酵过程中,含有质粒pTf16的重组大肠杆菌1,2,4-丁三醇产量达到1.01g/L,提高1.4倍。本发明为进一步代谢工程改造大肠杆菌生产1,2,4-丁三醇奠定了基础。本发明提供的重组大肠杆菌构建方法简单,便于使用,具有很好地应用前景。
具体实施方式
实例1
将E.coli(pEtac-mdlC-tac-xdh)菌体培养到OD600等于0.4-0.6时,从摇床取出,冰浴30min后离心。用0.1mol/L的CaCl2洗涤菌体,培养1h后涂布相应抗性平板,待其长出后挑取正确转化子,得到含有相应质粒的重组大肠杆菌E.coli(pEtac-mdlC-tac-xdh)/pG-KJE8,E.coli(pEtac-mdlC-tac-xdh)/pGro7,E.coli(pEtac-mdlC-tac-xdh)/pTf16,E.coli(pEtac-mdlC-tac-xdh)/pKJE7,E.coli(pEtac-mdlC-tac-xdh)/pG-Tf2。
实例2
从平板上挑取不同重组菌的单菌落,过夜培养后作为种子液,以1%的接种量接种于45mL LB中,同时加入2mg/ml阿拉伯糖或10ng/ml四环素诱导分子伴侣蛋白表达。待培养至OD600=0.6时加入IPTG和木糖母液,至IPTG、木糖终浓度分别为0.5mmol/L和20g/L,在37℃、200rpm下培养50h,取发酵上清液进行高效液相色谱检测。
实例3
首先将发酵液12 000rpm离心除去细胞,上清液用0.22μm混合纤维素酯微孔膜过滤即可用于HPLC检测。检测条件:Agilent 1260,RID检测器,色谱柱为Bio-Rad AminexHPX-87 column(300mm×7.8mm),柱温60℃,流动相为5mmol/L H2SO4,流速0.6mL/min。结果如表1所示,其中E.coli(pEtac-mdlC-tac-xdh)/pTf16的1,2,4-丁三醇产量达到1.01g/l。
表1含有不同分子伴侣蛋白的重组大肠杆菌的1,2,4-丁三醇产量
虽然本发明已以较佳实例公开如上,但其并非用以限定本发明,任何熟悉此技术的人,在不脱离本发明的精神和范围内,都可做各种的改动与修饰,因此本发明的保护范围应该以权利要求书所界定的为准。

Claims (1)

1.一种高产1,2,4-丁三醇的重组大肠杆菌,其特征在于,以重组大肠杆菌E.coli(pEtac-mdlC-tac-xdh)为出发菌株,导入含有分子伴侣蛋白的质粒pTf16,其中重组大肠杆菌E.coli(pEtac-mdlC-tac-xdh)是以E.coli W3100为宿主,以启动子Ptac调控Xdh、MdlC表达。
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