CN116240232A - 木葡糖酸醋杆菌中Weimberg木糖代谢途径的构建方法 - Google Patents
木葡糖酸醋杆菌中Weimberg木糖代谢途径的构建方法 Download PDFInfo
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Abstract
本发明属于基因工程领域,具体涉及一种木葡糖酸醋杆菌木糖利用代谢的构建方法。本发明将木糖Weimberg代谢途径相关基因构建于一个重组质粒表达载体上,将重组质粒整合到宿主菌木葡糖酸醋杆菌中获得重组木葡糖酸醋杆菌工程菌株CGMCC 26045(其于2022年11月4日保藏于中国微生物菌种保藏管理委员会普通微生物中心,保藏编号为CGMCCNo.26045)的构建方法。并通过发酵初步确定其利用木糖产细菌纤维素(bacterial cellulose,BC)的能力高于木葡糖酸醋杆菌原始菌。通过发酵参数测定,工程菌比野生菌BC膜产量提高了100%以上,木糖利用率提高了40%以上。
Description
技术领域
本发明属于基因工程技术领域,具体涉及木葡糖酸醋杆菌中异源表达木糖代谢途径及其应用。
背景技术
细菌纤维素(bacterial cellulose,BC)是由β-1,4糖苷键连接组成的一种独特的纳米聚合物。与植物纤维素相比,其不含半纤维素和木质素,且具有极高的纯度与生物降解性。经过功能化的细菌纤维素在化学传感、生物成像、生物医用材料等众多领域具有良好的应用前景。
木葡糖酸醋杆菌(Komagataeibacter xylinus,K.xylinus)是BC的主要生产菌株之一。目前在工业生产中所使用的HS培养基成本较高。为降低生产成本,廉价培养基的使用具有较高的研究前景。其中,木质纤维素是最首选的底物之一。木质纤维素是一种丰富的可再生资源,可以转化为多种生物能源和化学产品。其主要由纤维素、半纤维素、木质素组成,水解后的中间产物纤维二糖及终产物葡萄糖、木糖能够做为碳源供K.xylinus生长并产生BC。然而,相对于以葡萄糖为碳源生长生产BC时,野生型K.xylinus CGMCC2955(简称CGMCC2955)由于缺乏部分关键的木糖代谢通路酶,无法很好的利用木糖。所以对野生型CGMCC2955进行改造,异源表达木糖利用途径所需要的基因,有利于菌株对木糖的吸收利用,从而有利于BC的生产。
木质纤维素中纤维素和半纤维素通过化学或酶水解(糖化)等方式可以转化为发酵可用的五碳糖和六碳糖,如D-木糖。D-木糖是第二丰富的碳水化合物,其含量在草和硬木中特别高,在木质纤维素水解过程中会产生5-35%的D-木糖。有效利用木质纤维素生物质中释放的五碳糖和六碳糖进行大规模发酵是工业化应用的关键。因此,快速、高效地利用木糖是利用木质纤维素生物质生产生物燃料的先决条件。
目前,木糖分解代谢主要有三种途径,包括Weimberg途径、Dahms途径和氧化还原途径。Weimberg木糖代谢途径中,首先D-木糖在xylB基因编码的D-木糖脱氢酶的作用下被氧化成D-木糖-γ-内酯,然后在xylC基因编码的D-木糖-γ-内酯酶的催化下转化为D木糖酸盐,D-木糖酸脱水酶(由xylD编码)催化D木糖酸盐生成2-酮基-3-脱氧木酸盐,3-酮基-2-脱氧木酸脱水酶(由xylX编码)催化2-酮基-3-脱氧木酸盐生成a-酮戊二酸半醛。最后,a-酮戊二酸半醛脱氢酶(由xylA编码)催化a-酮戊二酸半醛生成a-酮戊二酸进入三羧酸循环,参与代谢。
总的来说,相比于其他两种途径,Weimberg途径将D-木糖在五个酶促步骤后被直接氧化成三羧酸(TCA)循环中间产物α-酮戊二酸直接进入三羧酸循环,代谢流程相对较短,整个过程不产生CO2,没有碳损失。并且因为木葡糖酸醋杆菌自身可以将木糖转化为木糖酸,因此,本发明选择木糖Weimberg代谢途径作为重组木葡糖酸醋杆菌工程菌株木糖代谢利用模块的路径。
发明内容
针对上述存在问题,本发明提出构建一种异源表达木糖代谢途径所需基因的工程菌及其应用:
一种木葡糖酸醋杆菌中Weimberg木糖代谢途径的构建方法,首次将木糖Weimberg代谢途径引入木葡糖酸醋杆菌中,将木糖Weimberg代谢途径相关基因构建于一个重组质粒表达载体上,将重组质粒通过高压电穿孔的方式导入到宿主菌CGMCC2955中获得重组木葡糖酸醋杆菌工程菌株CGMCC 26045的构建方法。
所述重组工程菌株构建方法,木葡糖酸醋杆菌可以自身将木糖转化成木糖酸,只需异源表达来自新月丙杆菌的木糖Weimberg代谢途径相关基因中的三个基因xylA(SEQ IDNO.4)、xylD(SEQ ID NO.5)、xylX(SEQ ID NO.6)。
所述重组工程菌株构建方法,将来自新月丙杆菌的木糖Weimberg代谢途径相关基因xylA(SEQ ID NO.4)、xylD(SEQ ID NO.5)、xylX(SEQ ID NO.6),经过密码子优化,按照如下顺序:xylA-xylD-xylX逐个连接到基础质粒pBla(SEQ ID NO.1)上,然后通过pBla上bla启动子(SEQ ID NO.2)和rrnB T1终止子(SEQ ID NO.2)表达,得到重组质粒。
所述重组工程菌株构建方法,重组质粒导入扩增质粒菌株CGMCC2955的转化方法采用高压电穿孔法,最终得到目标菌株CGMCC26045。
本发明为了克服CGMCC2955以木糖为碳源产生BC量少的困难,通过基因工程等手段,将Weimberg代谢途径关键基因整合到CGMCC2955中构建木葡糖酸醋杆菌工程菌株,获得重组木葡糖酸醋杆菌工程菌株CGMCC 26045,能够利用木糖为碳源的HS液体培养基进行生长代谢并生产BC,开辟了木糖资源化利用的新途径。
本发明构建1种重组质粒(SEQ ID NO.7),以CGMCC2955为底盘宿主菌,将重组质粒导入CGMCC2955中,重构木葡糖酸醋杆菌的代谢通路,提升了木葡糖酸醋杆菌利用木糖生产BC的能力,提高木糖的资源化利用效率及应用范围。
以pBla(SEQ ID NO.1)为基础质粒构建1种重组质粒(SEQ ID NO.7),在基础质粒上包括bla启动子(SEQ ID NO.2)和rrnB T1终止子(SEQ ID NO.3),得到重组质粒pBla-xylA-xylD-xylX(SEQ ID NO.7),将重组质粒转入野生型木葡糖酸醋杆菌CGMCC2955中,获得工程菌株为:
CGMCC26045:pBla-xylA-xylD-xylX(in CGMCC2955)
Weimberg代谢途径关键基因:
所述α-酮戊二酸半醛脱氢酶基因xylA(GeneBank ID:MG681091.1)源自新月丙杆菌的,核酸序列如图SEQ ID N0.4所示。
所述D-木糖酸脱水酶基因xylD(GeneBank ID:MG681089.1)源自新月丙杆菌的,核酸序列如图SEQ ID N0.5所示。
所述2-酮-3-脱氧-d-木糖酸脱水酶基因xylX(GeneBank ID:MG681090.1)源自新月丙杆菌的,核酸序列如图SEQ ID N0.6所示。
具体说明如下:
步骤一:重组质粒的设计与合成:基础质粒为pBla(SEQ ID NO.1),其上包括bla启动子(SEQ ID NO.2)和rrnB T1终止子(SEQ ID NO.3),将本发明所述目的基因xylA、xylD、xylX经密码子优化后,通过bla启动子和rrnB T1终止子表达;
步骤二:重组大肠杆菌和重组木葡糖酸醋杆菌菌株的构建:选取Escherichiacoli DH5α菌株(简称E.coli DH5α)为重组质粒扩增的工程菌用于质粒复制连接;选取CGMCC2955为最终宿主菌,将重组质粒(SEQ ID NO.7)转化进入E.coli DH5α的转化方法采用本领域常规的热休克转化法;然后,利用高压电穿孔技术将重组质粒(SEQ ID NO.7)转移到CGMCC2955感受态中,得到构建的目的工程菌。野生型菌株CGMCC2955作为空白对照,导入重组质粒到CGMCC2955宿主菌的工程菌株命名为:CGMCC26045。
步骤三:进行菌落PCR验证实验:琼脂糖凝胶结果表明,阳性克隆存在,证明目的基因在宿主菌中成功扩增,工程菌株中重组质粒的成功导入和扩增;
步骤四:摇瓶静置发酵及残糖测定实验验证:两株菌CGMCC2955,CGMCC26045在含有浓度为5g/L的木糖为碳源的HS培养基中静置发酵,每隔48h进行取样,将产生的BC膜进行处理后称重。
本发明的有益效果是:上述木糖代谢途径首次在木葡糖酸醋杆菌中的进行功能表达;本发明构建成功的重组木葡糖酸醋杆菌CGMCC26045,所含木糖代谢途径短,不参与PPP途径,能够克服野生型CGMCC2955以木糖为碳源产生BC量低的限制,提高了木糖的资源化利用率并扩展了其应用范围,也可以应用于生产或生活过程中,以木质纤维素水解液中的木糖成分的利用和BC生产及利用相关领域。
附图说明
图1所示为工程菌菌落PCR验证图:M为MAKER,1、2均为CGMCC26045,重组质粒验证选择xylA和启动子的连接处(1183bp);
图2所示为检测木糖含量时所需的标准曲线;
图3所示为本发明工程菌株以浓度为5g/L的木糖为碳源的HS培养基中木糖含量;
图4所示为本发明工程菌株以浓度为5g/L的木糖为碳源的HS培养基中BC产量。
具体实施方式
下面通过具体的实施方案叙述本发明。除非特别说明,本发明中所用的技术手段均为本领域技术人员所公知的方法。另外,实施方案应理解为说明性的,而非限制本发明的范围,本发明的实质和范围仅由权利要求书所限定。对于本领域技术人员而言,在不背离本发明实质和范围的前提下,对这些实施方案中的物料成分和用量进行的各种改变或改动也属于本发明的保护范围。其中本发明使用的木葡糖酸醋杆菌CGMCC2955和CGMCC26045在中国微生物菌种保藏管理委员会普通微生物中心有保藏(保藏号为CGMCC No.2955和CGMCCNo.26045)。木葡糖酸醋杆菌CGMCC26045的保藏单位:中国微生物菌种保藏管理委员会普通微生物中心;保藏时间:2022年11月4日;保藏地址:北京市朝阳区北辰西路1号院3号中国科学院微生物研究所;分类命名:木糖驹氏杆菌 Komagataeibacter xylinus。
实施例1:重组质粒的构建(SEQ ID NO.7)
步骤一:合成并优化上述能够促进木葡糖酸醋杆菌摄取木糖代谢利用的基因序列xylA-xylD-xylX(均来源于新月丙杆菌的木糖Weimberg代谢途径)。
步骤二:将上述三个基因通过BamHⅠ和EcoRⅠ酶切后,连入添加有BamHⅠ酶切位点,EcoRⅠ酶切位点的pBla质粒中,利用DNA无缝克隆技术得到质粒pBla-xylA-xylD-xylX(SEQID NO.7)。
上述构建的质粒转化入大肠杆菌感受态E.coli DH5α中,菌落PCR筛选,提质粒进行单双酶切验证及测序验证,以保证目的片段连接正确且碱基序列未发生改变。
实施例2:重组大肠杆菌E.coli DH5α和木葡糖酸醋杆菌的构建
步骤一:转化:将上述得到的重组质粒通过热休克转化法导入E.coli DH5α感受态中,采用LB培养基5g/L酵母提取物、10g/L胰蛋白胨、10g/L NaCl、50μg/L卡那霉素)进行筛选,在固体培养平板上挑出单菌落后,接种到LB液体培养基(5g/L酵母提取物、10g/L胰蛋白胨、10g/L NaCl、50μg/L卡那霉素)中进行培养,甘油管保菌。
步骤二:将上述得到的重组质粒通过高压电穿孔法转入木葡糖酸醋杆菌感受态中,电转后采用HS固体培养平板(7.5g/L酵母提取物、10g/L胰蛋白胨、10g/L十二水磷酸氢二钠、25g/L葡萄糖、50μg/L卡那霉素)30℃培养箱培养,得到木葡糖酸醋杆菌工程菌。
步骤三:菌落PCR进行验证:转化子在含有50μg/L卡那霉素的HS固体培养平板中生长,待长出明显单菌落,进行菌落PCR,所需引物、反应体系和PCR条件如下:
引物设计并合成:
xylA和启动子的连接处引物:
上游引物:5’-GACGAAAGGGCCTCGTGATAC-3’
下游引物:5’-ATCTGGGTGTTCGGGTCCAG-3’
PCR反应体系配置(trans fast Taq):ddH2O 8μL;上、下游引物各1μL;Taq酶mix:10μL;一个体系共20μL。
PCR条件为:95℃预变性5min,95℃变性30s,57℃退火30s,72℃延伸X s(1kb需要30s,只能时间富裕不能不足),32cycles,最后72℃延伸10min,4℃保温。
SDS-PAGE电泳检测上述菌落PCR的情况,观察有无目的条带并记录对应编号(见图1)
将验证成功的重组木葡糖酸醋杆菌工程菌保菌备用。
向CGMCC2955宿主菌中导入重组质粒后的工程菌命名为CGMCC26045。
实施例3:野生型菌株CGMCC2955和工程菌株CGMCC26045在含有5g/L木糖为碳源的HS培养基中静置发酵。
将所述野生型菌株CGMCC2955和工程菌株CGMCC26045接种到种子培养基活化培养,然后在发酵瓶中进一步进行静止培养,每隔48h取出一批,将发酵液取样离心取上清,用木糖试剂盒检测木糖含量;将每批取出的BC膜进行处理后称重并记录。每株菌做三组平行实验(见图4)
木糖代谢残糖测定:
步骤一:菌种活化:取经过高压蒸汽灭菌的培养基(100mL的摇瓶加30mLHS液体培养基)在超净台中加入加卡那霉素,从长有目的菌株的固体培养基平板上挑取单菌落,接菌,30℃,180rpm/min,培养12h左右,加入纤维素酶将纤维素丝溶解。
步骤二:摇瓶发酵:清洗菌体,将纤维素酶清洗干净,重悬菌体,测定菌体OD600,并将各菌株调至同一生长状态,按初始OD为0.02接种至30mL含有5g/L的木糖为碳源的HS培养基中,加入kana,30℃培养箱进行静置发酵培养。
步骤三:48h,96h,144h进行取样,每组留1mL发酵液离心取上清,利用北京索莱宝科技有限公司D-木糖含量检测试剂盒进行测定,具体操作步骤可参见D-木糖含量检测试剂盒说明书。简要操作步骤如下:
(1)标准液的处理:将标准品用蒸馏水倍比稀释至0.4、0.25、0.125、0.0625、0.03125、0.015625mg/mL的标准溶液备用。
(2)标准曲线的绘制
(3)混匀后沸水浴8min,冰浴处理将温度降至常温后测定其在554nm下的吸光度,以空白管标零,测定样品管吸光度。标准曲线见(见图2)。重组菌株和原始菌株的木糖利用情况见(见图3)。
实施例4:野生型菌株CGMCC2955和工程菌株CGMCC26045在含有5g/L的木糖为单一碳源的HS培养基中静置发酵产BC能力测定。
步骤一:一级种子菌液:取经过高压蒸汽灭菌的培养基(100mL的摇瓶加30mLHS液体培养基)在超净台中加入加kana,从长有目的菌株的固体培养基平板上挑取单菌落,接菌,30℃,180rpm/min,培养12h左右,加入纤维素酶将纤维素丝溶解12h左右。
步骤二:二级种子菌液:分别取装有30mLHS液体培养基的100mL锥形瓶,将野生型菌株CGMCC2955和工程菌株CGMCC26045分别取出3mL菌液按10%接种至相同的锥形瓶中,每瓶加入15μLkana(1:2000)、300μL纤维素酶按1%加入,30℃,180rpm/min,培养48h左右。
步骤三:48h,96h,144h进行取样,将BC膜取出,用0.1mol/L的NaOH,中途需要多次换新鲜NaOH浸泡,最终将膜浸泡至乳白色半透明状态。
步骤四:将浸泡至乳白色半透明状态的BC膜,继续用蒸馏水进行浸泡,中途需要多次换新鲜蒸馏水进行浸泡,最终将BC膜浸泡至PH为中性状态。
步骤五:将处理后的膜95℃压片干燥,进行称重,重组菌株和原始菌株的BC生产情况(见图4)。
本发明的有益效果是:
利用异源表达技术,结合基因工程等手段,构建一种重组质粒(SEQ ID NO.7),将木糖利用代谢的关键基因:xylA(SEQ ID NO.4),xylD(SEQ ID NO.5),xylX(SEQ ID NO.6)引入CGMCC2955中,重构CGMCC2955的代谢途径,使工程木葡糖酸醋杆菌能够在以木糖为碳源的改良后HS液体培养基中生产BC的产量有极大提高。将改造菌株进行发酵,并测定其在以木糖为碳源的改良后HS液体培养基中的残糖量和BC膜的产量。数据显示,菌株CGMCC26045与CGMCC2955相比,木糖利用率和BC的产量均有较大提升(见图4)。
本发明利用异源表达技术,结合基因工程等手段,构建重组质粒(SEQ ID NO.7),将木糖代谢的关键基因引入CGMCC2955中,得到能够以木糖为碳源提高BC产量的工程菌株:
CGMCC26045:pBla-XylA-XylD-XylX(in CGMCC2955)
从而增强了木糖利用的途径,降低BC生产的成本。
本发明公开和提出的技术方案,本领域技术人员可通过借鉴本文内容,适当改变条件路线等环节实现,以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对专利范围的限制。特别需要指出的是,对于本领域的技术人员来说,在不脱离本专利构思的前提下,上述各实施方式还可以做出若干变形、组合和改进,这些都属于本专利的保护范围。因此,本专利的保护范围应以权利要求为准。
Claims (5)
1.一种木葡糖酸醋杆菌中Weimberg木糖代谢途径的构建方法,其特征在于:首次将Weimberg木糖代谢途径引入木葡糖酸醋杆菌中,将木糖Weimberg代谢途径相关基因构建于一个重组质粒表达载体上,将重组质粒整合到宿主菌木葡糖酸醋杆菌中获得重组木葡糖酸醋杆菌工程菌株CGMCC 26045的构建方法。
2.根据权利要求1所述重组工程菌株构建方法,其特征在于:木葡糖酸醋杆菌可以自身将木糖转化成木糖酸,只需异源表达来自新月丙杆菌的木糖Weimberg代谢途径相关基因中的三个基因xylA(SEQ ID NO.4)、xylD(SEQ ID NO.5)、xylX(SEQ ID NO.6)。
3.根据权利要求1所述重组工程菌株构建方法,其特征在于:将来自新月丙杆菌的木糖Weimberg代谢途径相关基因xylA、xylD、xylX,经过密码子优化,按照如下顺序:xylA-xylD-xylX逐个连接到基础质粒pBla(SEQ ID NO.1)上,然后通过pBla上bla启动子(SEQ IDNO.2)和rrnB T1终止子(SEQ ID NO.3)表达,得到重组质粒pBla-xylA-xylD-xylX(SEQ IDNO.7)。
4.根据权利要求1所述重组工程菌株构建方法,其特征在于:所述基因工程菌来源于木葡糖酸醋杆菌。
5.根据权利要求1所述菌株在发酵制备细菌纤维素中的应用。
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