WO2017186026A1 - 一种高产l-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法 - Google Patents

一种高产l-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法 Download PDF

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WO2017186026A1
WO2017186026A1 PCT/CN2017/080902 CN2017080902W WO2017186026A1 WO 2017186026 A1 WO2017186026 A1 WO 2017186026A1 CN 2017080902 W CN2017080902 W CN 2017080902W WO 2017186026 A1 WO2017186026 A1 WO 2017186026A1
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corynebacterium glutamicum
pcr
gene
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王瑞明
汪俊卿
王蕾
王腾飞
李桂华
王建彬
隋松森
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齐鲁工业大学
诸城东晓生物科技有限公司
山东省饲料质量检验所
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Priority to EP17788678.5A priority Critical patent/EP3401390B1/en
Publication of WO2017186026A1 publication Critical patent/WO2017186026A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
    • C07K14/34—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Corynebacterium (G)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/87—Introduction of foreign genetic material using processes not otherwise provided for, e.g. co-transformation
    • C12N15/90—Stable introduction of foreign DNA into chromosome
    • C12N15/902—Stable introduction of foreign DNA into chromosome using homologous recombination
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P13/00—Preparation of nitrogen-containing organic compounds
    • C12P13/04—Alpha- or beta- amino acids
    • C12P13/08—Lysine; Diaminopimelic acid; Threonine; Valine
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00—Microorganisms ; Processes using microorganisms
    • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/15—Corynebacterium

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  • the invention relates to a method for constructing a strain of Corynebacterium glutamicum with high production of L-lysine, belonging to the technical field of biotechnology.
  • L-lysine belongs to the aspartic acid family of amino acids and is one of the eight essential amino acids in humans and animals. L-lysine has a variety of physiological functions, such as having a balanced amino acid composition, regulating metabolic balance in the body, improving the body's absorption and utilization of cereal proteins, and promoting the growth and development of the body, thus being widely used in the feed, food and pharmaceutical industries. in. Due to strong market demand, L-lysine has become the second largest amino acid species after glutamate, with an annual output of about 3.5 million tons. There are three main methods for industrially producing L-lysine, namely, proteolysis, chemical synthesis, and microbial fermentation. Among them, the microbial fermentation method has become the mainstream method of L-lysine production due to its advantages of low cost, high yield and low pollution.
  • the microorganisms currently available for L-lysine production are mainly bacteria, including Corynebacterium, Brevibacterium, Candida, Pseudomonas, Bacillus, Escherichia, etc., among which are glutamic acid sticks belonging to the genus Corynebacterium. Bacillus is currently the most widely used. Although natural microorganisms can directly ferment L-lysine, the yield is usually low, so the microorganisms need to be modified.
  • the Chinese invention patent CN1539015 discloses a plurality of genetic improvement sites which can be used for the improvement of lysine production, including accBC, accDA, catA, cysD and cysE.
  • Chinese patents CN101600796 (application No. 200780048626.8), CN1974760 (application number 200610163142.5), CN103243042 (application number 201310092638.8) inactivated the genes NCg22534, NCgl1835, NCg21090, respectively, to obtain a series of glutamic acid rods with improved L-lysine yield.
  • Bacillus engineering bacteria inactivated the genes NCg22534, NCgl1835, NCg21090, respectively, to obtain a series of glutamic acid rods with improved L-lysine yield.
  • the present invention is directed to the deficiencies of the prior art, and provides a method for constructing a strain of Corynebacterium glutamicum that produces L-lysine with high yield.
  • the invention is obtained by transforming the strain Corynebacterium glutamicum, and the specific strategy is to inactivate the endogenous gene of the glutamic acid Corynebacterium NCgl1221 (encoding glutamate extracellular transporter) to reduce the extracellular secretion of glutamate during lysine fermentation.
  • inactivation can be induced by any inactivation method known in the art.
  • the effect of "inactivation” means that the expression of the endogenous gene NCgl1221 is reduced to a very low level, or a product which does not express a gene and which has no activity or decreased activity despite being expressed.
  • activation may be by genetic engineering means inserting one or more base pairs into the endogenous gene NCgl1221, or deleting one or more base pairs in the endogenous gene NCgl1221, or by internal sequence of the gene Converted or transposed.
  • a high-yield L-lysine-resistant strain of Corynebacterium glutamicum is constructed by inactivating the NCgl1221 gene of Corynebacterium glutamicum, and the nucleotide sequence of the NCgl1221 gene coding frame is SEQ ID NO. .1 is shown.
  • the Corynebacterium glutamicum is derived from the China Industrial Microbial Culture Collection Management Center, strain number CICC 23604.
  • the above construction method has the following steps:
  • a gene fragment of greater than 400 bp in length in the coding frame of NCg l1221 gene is amplified by PCR as a homologous arm sequence, and the nucleotide sequence of the coding block of NCgl1221 gene is shown in SEQ ID NO.
  • the homologous arm sequence obtained in the step (1) and the resistance tag gene fragment obtained in the step (2) are ligated by overlapping PCR, and the fusion fragment has the same restriction endonuclease at both ends.
  • the site is digested, and the cleavage site cannot be present in the knockout gene and the resistance tag gene;
  • the genomic DNA of Corynebacterium glutamicum is used as a template to obtain the homologous arm NCg1, and the nucleotide sequence of the PCR amplification primer is as follows: :
  • the reaction system for PCR amplification is as follows, the total system is 50 ⁇ l:
  • the PCR amplification procedure is as follows:
  • the PCR amplification template is the DNA of the shuttle plasmid pHT01 (purchased from Hangzhou Baosai Biotechnology Co., Ltd.), and the chloramphenicol resistance gene Cm r is obtained ; PCR amplification primers
  • the nucleotide sequence is as follows:
  • the reaction system for PCR amplification is as follows, the total system is 50 ⁇ l:
  • the PCR amplification procedure is as follows:
  • the first stage amplification system of the overlapping PCR is as follows, and the total system is 25 ⁇ l:
  • the first stage amplification procedure for overlapping PCR is as follows:
  • the second stage amplification system of overlapping PCR is based on the product after the first stage amplification, and the following components are added, the total system is 50 ⁇ l:
  • the second stage amplification procedure for overlapping PCR is as follows:
  • the specific steps of the step (4) are as follows:
  • the fusion gene obtained in the step (3) is subjected to single digestion, and digested at 28 to 32 ° C for 2 to 5 hours, and transformed into the competent cells prepared in the step (i) by high-voltage electric shock, and transferred to a liquid resuscitation medium. After culturing for 3 to 4 hours at 28 to 32 ° C, screening is obtained.
  • the single digestion system in the step (ii) is as follows, and the total system is 40 ⁇ l:
  • the seed culture medium has the following composition per liter:
  • Peptone 8 to 12 g yeast powder 4 to 6 g, sodium chloride 8 to 12 g, and sorbitol 85 to 96 g.
  • the electro-transfer buffer has the following composition per liter:
  • the condition of the high voltage electric shock conversion is: 2100V electric shock for 5 ms.
  • the liquid resuscitation medium in the step (ii) has the following composition per liter:
  • Peptone 8 to 12 g yeast powder 4 to 6 g, sodium chloride 8 to 12 g, sorbitol 85 to 96 g, and mannitol 65 to 73 g.
  • the invention provides a method for constructing a strain of Corynebacterium glutamicum with high L-lysine production, and the strain is obviously reduced in the extracellular secretion of glutamic acid due to inactivation of the endogenous gene NCgl1221, compared with the wild type.
  • the strain can produce high concentration of L-lysine and can effectively reduce the content of glutamic acid as a by-product of the fermentation broth. As an L-lysine producing strain, the production and purification costs can be further reduced.
  • PCR primer sequences are as follows:
  • the PCR amplification system is:
  • the PCR amplification procedure is as follows:
  • the PCR product was examined by agarose gel electrophoresis and the length was 528 bp.
  • the gel was recovered by using SanPrep column DNA gel recovery kit (Shanghai Shenggong), and the recovered product was stored at -20 ° C for use.
  • PCR primer sequences are as follows:
  • the PCR amplification system is:
  • the PCR amplification procedure is as follows:
  • the PCR product was tested by agarose gel electrophoresis and the length was 1274 bp.
  • the gel was recovered by using SanPrep column DNA gel recovery kit (Shanghai Shenggong), and the recovered product was stored at -20 ° C for use.
  • the amplification system of the overlapping PCR is:
  • the first stage amplification procedure of the overlapping PCR is as follows:
  • the second stage amplification procedure of the overlapping PCR is as follows:
  • the PCR product was tested by agarose gel electrophoresis and the length was 1777 bp.
  • the gel was recovered by using SanPrep column DNA gel recovery kit (Shanghai Shenggong), and the recovered product was stored at -20 ° C for use.
  • Seed medium the components are as follows:
  • Electroporation buffer the composition per liter is as follows:
  • NCg1-Cm r fragment was digested with restriction endonuclease BamH I at 30 ° C for 3 h;
  • the digestion system (40 ⁇ L) is as follows:
  • the concentration of NCg1-Cm r fragment was measured by nucleic acid ultra-micro spectrophotometer, and the electroporation was performed after 2100V electric shock for 5ms after reaching 300 ⁇ g/mL concentration.
  • the obtained cells were cultured in resuscitation medium at 30°C for 1h, and then coated with 100 ⁇ L.
  • Transformants having chloramphenicol resistance were selected by culturing on a LB solid medium of 200 ⁇ g/mL chloramphenicol at 37 ° C for 2 days.
  • Liquid resuscitation medium the composition per liter is as follows:
  • Example 4 Culture and identification of positive recombinant bacteria
  • the above positive recombinant colonies were picked, inoculated into liquid LB medium containing 200 ⁇ g/mL chloramphenicol resistance, and cultured at 37 ° C overnight. After the completion of the culture, the recombinant DNA was extracted using a kit provided by Shanghai Bioengineering Co., Ltd., and The obtained genome is a template, and F 1 and R 2 are primers for PCR amplification, and the amplified products are verified by agarose gel electrophoresis;
  • PCR primer sequences are as follows:
  • the PCR amplification system is 20 ⁇ l:
  • the PCR amplification procedure is as follows:
  • the PCR product was examined by agarose gel electrophoresis. The results showed that a specific gene band could be amplified using primers F 1 and R 2 with a size of about 1800 b, which is close to the theoretical value of 1777 bp, indicating that the target gene has been successfully integrated into glutamine.
  • primers F 1 and R 2 with a size of about 1800 b, which is close to the theoretical value of 1777 bp, indicating that the target gene has been successfully integrated into glutamine.
  • a strain of Corynebacterium glutamicum with high production of L-lysine was prepared.
  • the prepared L-lysine-producing bacteria of Corynebacterium glutamicum was inoculated into 100 mL of LBG medium (glucose 5 g/L, peptone 10 g/L, yeast extract 5 g/L, NaCl 10 g/L) at 220 rpm 30 ° C.
  • the seeds were cultured for 20 h, and then inoculated to 100 mL of fermentation medium (glucose 100 g/L, peptone 20 g/L, corn syrup 30 mL, urea 5 g/L, (NH4) 2 SO 4 25 g/L, according to 2% by volume.

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Abstract

提供了一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法，该工程菌是将谷氨酸棒状杆菌(Corynebacterium glutamicum)的NCgl1221基因失活后构建获得，NCgl1221基因编码框的核苷酸序列如SEQ ID NO.1所示。

Description

一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法 技术领域
本发明涉及一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法，属于生物技术技术领域。
背景技术
L-赖氨酸属于天冬氨酸家族氨基酸，是人和动物体八大必须氨基酸之一。L-赖氨酸具有多种生理功能，如具备平衡氨基酸组成、调节体内代谢平衡、提高机体对谷类蛋白质的吸收及利用率和促进机体生长发育等，因而被广泛应用于饲料、食品及医药行业中。由于市场需求旺盛，L-赖氨酸目前已成为仅次于谷氨酸的第二大氨基酸品种，年产量约350万吨。工业上生产L-赖氨酸的方法主要有三种，即蛋白水解法、化学合成法和微生物发酵法。其中微生物发酵法由于具有低成本、高产率、低污染等优势成为目前L-赖氨酸生产的主流方法。
目前可用于L-赖氨酸生产的微生物主要为细菌，包括棒状杆菌、短杆菌、念球菌、假单胞菌、芽孢杆菌、埃希氏菌等，其中以属于棒状杆菌属的谷氨酸棒状杆菌目前应用最为广泛。虽然自然界微生物能够直接发酵产生L-赖氨酸，但产量通常较低，因此需要对微生物进行改造。如中国发明专利CN1539015公开了包括accBC、accDA、catA、cysD、cysE在内的多个可用于赖氨酸产量提高的基因改进位点。中国专利文献CN101600796(申请号200780048626.8)、CN1974760(申请号200610163142.5)、CN103243042(申请号201310092638.8)分别对基因NCg22534、NCgl1835、NCg21090进行失活获得一系列L-赖氨酸产率提高的谷氨酸棒状杆菌工程菌。
发明内容
本发明针对现有技术的不足，提供一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌的构建方法。本发明通过改造菌株谷氨酸棒状杆菌获得，具体策略为失活谷氨酸棒状杆菌内源基因NCgl1221(编码谷氨酸胞外转运蛋白)以降低赖氨酸发酵过程中谷氨酸的胞外分泌，减少L-赖氨酸发酵时发酵液中副产物谷氨酸的含量，使更多的碳流量流向L-赖氨酸合成方向，提高L-赖氨酸发酵底物利用率，便于纯化。
术语说明
本发明中，“失活”可以通过本领域已知的任何失活方法来诱导。“失活”产生的效果是指内源基因NCgl1221的表达被降低到很低的水平，或者产生不表达基因以及尽管被表达但表达不具有活性或活性降低的产物。
本发明中，“失活”可以通过基因工程手段在内源基因NCgl1221中插入一个或多个碱基对，或者缺失该内源基因NCgl1221中的一个或多个碱基对，或者由基因内部序列转换或颠换获得。
本发明技术方案如下：
一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌，是将谷氨酸棒状杆菌(Corynebacterium glutamicum)的NCgl1221基因失活后构建获得，NCgl1221基因编码框的核苷酸序列如SEQ ID NO.1所示。
根据本发明优选的，所述谷氨酸棒状杆菌(Corynebacterium glutamicum)来源于中国工业微生物菌种保藏管理中心，菌种编号CICC 23604。
根据本发明优选的，上述构建方法，步骤如下：
(1)通过PCR扩增NCg l1221基因编码框内一段长度大于400bp的基因片段作为同源臂序列，NCgl1221基因编码框的核苷酸序列如SEQ ID NO.1所示；
(2)通过PCR扩增抗性标签基因片段；
(3)将步骤(1)制得的同源臂序列与步骤(2)制得的抗性标签基因片段进行重叠PCR进行连接，制得融合片段的两末端均含有相同的限制性内切酶酶切位点，并且该酶切位点不能出现在拟敲除基因和抗性标签基因中；
(4)制备谷氨酸棒状杆菌感受态细胞，将步骤(3)制得的融合基因经酶切后转化谷氨酸棒状杆菌感受态细胞，即得。
根据本发明进一步优选的，所述步骤(1)中，PCR扩增以谷氨酸棒状杆菌(Corynebacterium glutamicum)的基因组DNA为模板，获得同源臂NCg1，PCR扩增引物的核苷酸序列如下：
Figure PCTCN2017080902-appb-000001
PCR扩增的反应体系如下，总体系为50μl：
Figure PCTCN2017080902-appb-000002
PCR扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸30sec，30个循环；72℃延伸10min，4℃保存。
根据本发明优选的，所述步骤(2)中，PCR扩增模板为穿梭质粒pHT01(购自杭州宝赛生物科技有限公司)的DNA，获得氯霉素抗性基因Cmr；PCR扩增引物的核苷酸序列如下：
Figure PCTCN2017080902-appb-000003
PCR扩增的反应体系如下，总体系为50μl：
Figure PCTCN2017080902-appb-000004
所述的PCR扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸3min，30个循环；72℃延伸10min，4℃保存。
根据本发明优选的，所述步骤(3)中，重叠PCR的第一阶段扩增体系如下，总体系为25μl：
Figure PCTCN2017080902-appb-000005
重叠PCR的第一阶段扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸2min，5个循环；72℃延伸10min；
重叠PCR的第二阶段扩增体系为在第一阶段扩增后的产物基础上加入如下成分，总体系为50μl：
Figure PCTCN2017080902-appb-000006
重叠PCR的第二阶段扩增程序如下：
95℃预变性5min；94℃变性30sec，58℃退火30sec，72℃延伸4min，30个循环；72℃延伸10min，4℃保存。
根据本发明优选的，所述步骤(4)的具体步骤如下：
(i)挑取谷氨酸棒状杆菌(Corynebacterium glutamicum)单菌落，在种子培养基中培养至菌体浓度OD600为0.7～0.9，置于冰上冷却，冷却后离心，用预冷的电转缓冲液洗涤菌体3～5次，电转缓冲液重悬菌体，制得感受态细胞；
(ii)对步骤(3)制得的融合基因进行单酶切，28～32℃酶切2～5h，高压电击转化至步骤(i)制得的感受态细胞中，移入液体复苏培养基，在28～32℃培养3～4h后，筛选，即得。
根据本发明进一步优选的，所述步骤(ii)中单酶切体系如下，总体系为40μl：
Figure PCTCN2017080902-appb-000007
Figure PCTCN2017080902-appb-000008
根据本发明进一步优选的，所述步骤(i)中，种子培养基，每升组分如下：
蛋白胨8～12g、酵母粉4～6g、氯化钠8～12g、山梨醇85～96g。
根据本发明进一步优选的，所述步骤(i)中，电转缓冲液，每升组分如下：
山梨醇85～96g、甘露醇85～96g、甘油95～105mL。
根据本发明进一步优选的，所述步骤(i)中，高压电击转化的条件为：2100V电击5ms。
根据本发明进一步优选的，所述步骤(ii)中液体复苏培养基，每升组分如下：
蛋白胨8～12g、酵母粉4～6g、氯化钠8～12g、山梨醇85～96g、甘露醇65～73g。
上述构建方法制得的高产L-赖氨酸的谷氨酸棒状杆菌工程菌在生产L-赖氨酸中的应用。
构建原理
谷氨酸胞外转运蛋白，负责谷氨酸的胞外分泌，但在高产L-赖氨酸菌种中，发明人通过研究发现该基因的表达则会造成L-赖氨酸发酵时发酵液中副产物谷氨酸的含量的增加，导致碳流量流向L-赖氨酸合成方向减少，进而影响包括赖氨酸的合成在内的细胞其它代谢过程。因此，通过构建NCgl1221基因失活，从而达到获得L-赖氨酸高产的重组菌。
有益效果
本发明提供一种高产L-赖氨酸的谷氨酸棒状杆菌菌株的构建方法，构建的该菌株由于内源基因NCgl1221失活引起谷氨酸胞外分泌量明显降低，与野生型相比，该菌株可生产高浓度的L-赖氨酸，并能有效降低发酵液副产物谷氨酸的含量，作为L-赖氨酸生产菌株能够进一步降低生产和纯化成本。
具体实施方式
下面结合实施例对本发明的技术方案做进一步阐述，但本发明所保护范围不限于此。
实施例1：基因敲除片段构建
1)(i)提取谷氨酸棒状杆菌(Corynebacterium glutamicum)23604基因组DNA，以该基因组DNA为模板，进行PCR扩增，得到同源臂NCg1；
所述的PCR引物序列如下：
Figure PCTCN2017080902-appb-000009
所述的PCR扩增体系为：
Figure PCTCN2017080902-appb-000010
Figure PCTCN2017080902-appb-000011
所述的PCR扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸30sec，30个循环；72℃延伸10min，4℃保存；
琼脂糖凝胶电泳检验PCR产物，长度为528bp，使用SanPrep柱式DNA胶回收试剂盒(上海生工)进行胶回收，回收产物-20℃保存，备用；
(ii)提取穿梭质粒pHT01(购自杭州宝赛生物科技有限公司)的DNA，以DNA为模板，进行PCR扩增，得到Cmr片段；
所述的PCR引物序列如下:
Figure PCTCN2017080902-appb-000012
所述的PCR扩增体系为：
Figure PCTCN2017080902-appb-000013
所述的PCR扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸3min，30个循环；72℃延伸10min，4℃保存；
琼脂糖凝胶电泳检验PCR产物，长度为1274bp，使用SanPrep柱式DNA胶回收试剂盒(上海生工)进行胶回收，回收产物-20℃保存，备用；
(iii)将步骤(i)制得的NCg1片段与步骤(ii)制得的Cmr片段进行重叠PCR，制得NCg1-Cmr片段；
所述的重叠PCR的扩增体系为：
Figure PCTCN2017080902-appb-000014
Figure PCTCN2017080902-appb-000015
所述的重叠PCR的第一阶段扩增程序如下：
95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸2min，5个循环；72℃延伸10min；
所述的重叠PCR的第二阶段扩增程序如下：
95℃预变性5min；94℃变性30sec，58℃退火30sec，72℃延伸4min，30个循环；72℃延伸10min，4℃保存；
琼脂糖凝胶电泳检验PCR产物，长度为1777bp，使用SanPrep柱式DNA胶回收试剂盒(上海生工)进行胶回收，回收产物-20℃保存，备用；
实施例2：制备地衣芽孢杆菌感受态
(i)挑取谷氨酸棒状杆菌(Corynebacterium glutamicum)23604单菌落，接种于10mL种子培养基中，37℃、220r/min，过夜培养；
种子培养基，组分如下：
蛋白胨10g、酵母粉5g、氯化钠10g、山梨醇91g。
(ii)取1mL上述菌液转接到100mL种子培养基中，37℃、220r/min培养至OD600＝0.9；
(iii)将菌液转移至100mL离心管，冰浴15-20min，使菌体停止生长；
(iv)冰浴后4℃、5000g、5min离心，收集菌体；
(v)离心后的菌体用预冷的电转缓冲液(ETM)洗涤3次；
电转缓冲液，每升组分如下：
山梨醇91g、甘露醇91g、甘油100mL。
(vi)洗涤结束后，使用1000μL电转缓冲液重悬菌体；
(vii)将制备好的感受态细胞分装100μL每管，-80℃保存，备用。
实施例3：NCg1-Cmr片段电转化谷氨酸棒状杆菌(Corynebacterium glutamicum)23604
(i)将NCg1-Cmr片段用限制性内切酶BamH I，30℃酶切3h；
酶切体系(40μL)如下：
Figure PCTCN2017080902-appb-000016
(ii)浓缩纯化酶切产物
(1)加入1/10体积3M醋酸钠和2.5倍体积无水乙醇，置于-20℃冰箱20min；
(2)12000r/min，离心5min得沉淀；
(3)300μL体积百分比为75％的乙醇重悬沉淀；
(4)12000r/min，离心5min，除去乙醇，37℃风干30min，
(5)加入15～18μL ddH2O重悬DNA，并置于-20℃保存。
(iii)电转化
首先利用核酸超微量分光光度计测定NCg1-Cmr片段浓度，达到300μg/mL浓度后2100V电击5ms，进行电转化，得到的细胞使用复苏培养基30℃复苏培养1h后，取100μL涂布在含200μg/mL氯霉素的LB固体培养基上，在37℃培养2天，筛选具有氯霉素抗性的转化子。
液体复苏培养基，每升组分如下：
蛋白胨10g、酵母粉5g、氯化钠10g、山梨醇91g、甘露醇69.4g。
实施例4：阳性重组菌的培养及鉴定
挑取上述阳性重组菌落，接种到含200μg/mL氯霉素抗性的液体LB培养基中37℃培养过夜，培养完成后，使用上海生物工程有限公司提供的试剂盒提取重组菌DNA，并以获得的基因组为模板，F1和R2为引物进行PCR扩增，扩增产物利用琼脂糖凝胶电泳进行验证；
所述的PCR引物序列如下：
Figure PCTCN2017080902-appb-000017
其中，下划线标识的为酶切位点
所述的PCR扩增体系为20μl：
Figure PCTCN2017080902-appb-000018
所述的PCR扩增程序如下：
95℃预变性5min；94℃变性30sec，57℃退火30sec，72℃延伸4min，30个循环；72℃延伸10min，4℃保存；
琼脂糖凝胶电泳检验PCR产物，结果显示，使用引物F1和R2能够扩增出一条特异性基因条带，大小约为1800b，与理论值1777bp接近，表明目的基因已成功整合到谷氨酸棒状杆菌基因组上，制得高产L-赖氨酸的谷氨酸棒状杆菌工程菌。
实施例4：L-赖氨酸发酵测试
将制备的高产L-赖氨酸的谷氨酸棒状杆菌工程菌接种至100mL LBG培养基(葡萄糖5g/L，蛋白胨10g/L，酵母膏5g/L，NaCl 10g/L)中220rpm 30℃下进行种子培养20h，其后按体积百分比2％接种量接种至100mL发酵培养基(葡萄糖100g/L，蛋白胨20g/L，玉米浆30mL，尿素5g/L，(NH4)2SO4 25g/L，L-亮氨酸0.34g/L，KH2PO4 2g/L，MgSO4·7H2O1.5g/L，生物素0.001g/L)发酵培养36h，并通过日立L-8900型高速氨基酸自动分析仪测定发酵液中氨基酸的含量。
结果显示与原始菌相比，高产L-赖氨酸的谷氨酸棒状杆菌工程菌发酵液中谷氨酸的含量由3.8g/L降低至仪器未检出水平，赖氨酸的产量由40.0g/L提升至43.2g/L。

Claims (10)

  1. 一种高产L-赖氨酸的谷氨酸棒状杆菌工程菌，其特征在于，将谷氨酸棒状杆菌(Corynebacterium glutamicum)的NCgl1221基因失活后构建获得，NCgl1221基因编码框的核苷酸序列如SEQ ID NO.1所示。
  2. 如权利要求1所述的构建方法，其特征在于，所述谷氨酸棒状杆菌(Corynebacterium glutamicum)来源于中国工业微生物菌种保藏管理中心，菌种编号CICC 23604。
  3. 如权利要求1或2所述的构建方法，其特征在于，步骤如下：
    (1)通过PCR扩增NCg l1221基因编码框内一段长度大于400bp的基因片段作为同源臂序列，NCgl1221基因编码框的核苷酸序列如SEQ ID NO.1所示；
    (2)通过PCR扩增抗性标签基因片段；
    (3)将步骤(1)制得的同源臂序列与步骤(2)制得的抗性标签基因片段进行重叠PCR进行连接，制得融合片段的两末端均含有相同的限制性内切酶酶切位点，并且该酶切位点不能出现在拟敲除基因和抗性标签基因中；
    (4)制备谷氨酸棒状杆菌感受态细胞，将步骤(3)制得的融合基因经酶切后转化谷氨酸棒状杆菌感受态细胞，即得。
  4. 如权利要求3所述的构建方法，其特征在于，所述步骤(1)中，PCR扩增以谷氨酸棒状杆菌(Corynebacterium glutamicum)的基因组DNA为模板，PCR扩增引物的核苷酸序列如下：
    F1:CGGGATCCCGTTTTTCATGCTTGCCGTCT；
    R1:AAGGCCAGCAAAA GCTAAAGCCCAAGAATGCAAC；
    PCR扩增的反应体系如下，总体系为50μl：
    Figure PCTCN2017080902-appb-100001
    PCR扩增程序如下：
    95℃预变性5min；94℃变性30sec，54℃退火30sec，72℃延伸30sec，30个循环；72℃延伸10min，4℃保存。
  5. 如权利要求3所述的构建方法，其特征在于，所述步骤(2)中，PCR扩增模板为穿梭质粒pHT01的DNA；PCR扩增引物的核苷酸序列如下：
    F2:GGTGGTCGGCATTTTTGCTGGCCTTTTGCTCA；
    R2:CATAATCGGCTGGATCCTAGTGACTGGCGATGCT；
    PCR扩增的反应体系如下，总体系为50μl：
    Figure PCTCN2017080902-appb-100002
    所述的PCR扩增程序如下：
    95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸3min，30个循环；72℃延伸10min，4℃保存。
  6. 如权利要求3所述的构建方法，其特征在于，所述步骤(3)中，重叠PCR的第一阶段扩增体系如下，总体系为25μl：
    Figure PCTCN2017080902-appb-100003
    重叠PCR的第一阶段扩增程序如下：
    95℃预变性5min；94℃变性30sec，55℃退火30sec，72℃延伸2min，5个循环；72℃延伸10min；
    重叠PCR的第二阶段扩增体系为在第一阶段扩增后的产物基础上加入如下成分，总体系为50μl：
    Figure PCTCN2017080902-appb-100004
    重叠PCR的第二阶段扩增程序如下：
    95℃预变性5min；94℃变性30sec，58℃退火30sec，72℃延伸4min，30个循环；72℃延伸10min，4℃保存。
  7. 如权利要求3所述的构建方法，其特征在于，所述步骤(4)的具体步骤如下：
    (i)挑取谷氨酸棒状杆菌(Corynebacterium glutamicum)单菌落，在种子培养基中培养至菌体浓度OD600为0.7～0.9，置于冰上冷却，冷却后离心，用预冷的电转缓冲液洗涤菌体3～5次，电转缓冲液重悬菌体，制得感受态细胞；
    (ii)对步骤(3)制得的融合基因进行单酶切，28～32℃酶切2～5h，高压电击转化至步骤(i)制得的感受态细胞中，移入液体复苏培养基，在28～32℃培养3～4h后，筛选，即得。
  8. 如权利要求7所述的构建方法，其特征在于，所述步骤(ii)中单酶切体系如下，总体系为40μl：
    Figure PCTCN2017080902-appb-100005
  9. 如权利要求7所述的构建方法，其特征在于，所述步骤(i)中，种子培养基，每升组分如下：
    蛋白胨8～12g、酵母粉4～6g、氯化钠8～12g、山梨醇85～96g；
    优选的，所述步骤(i)中，电转缓冲液，每升组分如下：
    山梨醇85～96g、甘露醇85～96g、甘油95～105mL；
    优选的，所述步骤(i)中，高压电击转化的条件为：2100V电击5ms；
    优选的，所述步骤(ii)中液体复苏培养基，每升组分如下：
    蛋白胨8～12g、酵母粉4～6g、氯化钠8～12g、山梨醇85～96g、甘露醇65～73g。
  10. 权利要求1所述构建方法制得的高产L-赖氨酸的谷氨酸棒状杆菌工程菌在生产L-赖氨酸中的应用。
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