CN116555062B - 基于乙醇代谢流调控提升酿酒酵母生产l-乳酸的方法 - Google Patents
基于乙醇代谢流调控提升酿酒酵母生产l-乳酸的方法 Download PDFInfo
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Abstract
本发明公开了基于乙醇代谢流调控提升酿酒酵母生产L‑乳酸的方法,属于微生物技术领域。本发明以耐酸酿酒酵母TJG16作为生产菌株,在发酵有机酸过程具有酿酒酵母的耐酸性,大幅度提升了L‑乳酸的产量。对酿酒酵母TJG16做了改进,引入了枯草芽孢杆菌来源的乙醇脱氢酶基因adhA促使乙醇转化成乙醛,及引入布鲁氏菌来源的乳酸醛缩酶基因BAL促使乙醛合成乳酸。并敲除乙醛脱氢酶基因ALD6阻止乙醛合成乙酸,敲除调控半乳糖的转录调节因子编码基因GAL80并整合乳酸脱氢酶LDH,最终实现L‑LA的提升,产量从最初的47.7g/L提升到50.5~192.3g/L。本发明提供的重组酿酒酵母进一步提升L‑乳酸的生产性能,有利于提高生产效率的同时降低生产成本。
Description
技术领域
本发明涉及基于乙醇代谢流调控提升酿酒酵母生产L-乳酸的方法,属于微生物发酵技术领域。
背景技术
L -乳酸(L-LA, CH3CHCOOH)是一种天然有机酸,广泛应用于食品、医药、化妆品、烟草和化工等行业。微生物发酵由于可以利用广泛的原料,生产成本低,提供高光学纯度的产量,并确保产品安全,已成为生产L-LA的主流方法。目前,酿酒酵母Saccharomyces cerevisiae因其耐酸性和明确的遗传背景,已被广泛应用于多种有机酸的生物合成,如L -苹果酸、L-乳酸和粘康酸。将L-乳酸脱氢酶(L-lactate dehydrogenase, L-LDH)引入酿酒酵母中可以实现L-LA的生物合成。在此基础上,一些代谢调控策略被应用于酿酒酵母生产L-LA的细胞工厂的构建,包括增强关键酶L-LDH的表达,减弱副产物合成途径,加速细胞外运输。例如,利用整合表达策略,用来自瑞士乳杆菌Helveticus的LDH替代PDC1,构建了携带LDH和PDC1缺失的突变株,其L-乳酸滴度高达52.2 g/L。然而,酿酒酵母异源基因表达效率低,产量不高这个问题一直没有得到很大的突破。
近年来,多项研究聚焦于耐酸酿酒酵母菌株的选择和分离。例如,Jang等通过适应性实验室进化(Adaptive Laboratory Evolution, ALE)获得了一株耐酸(pH 4.2)的菌株(酿酒酵母BK01),该菌株使L- la滴度从102 g/L提高到119 g/L,提高了17% 。在我们之前的研究中,我们使用ALE分离了一个耐受低pH(pH 2.4)的酿酒酵母突变体突变体MTPfo-4(申请号为202010631510.4)。并进行了一系列代谢通路改造,获得重组菌株TJG16(记载于公开号为CN 114854612 A 的专利文献中),使L-LA产量达到47.7 g/L。在改造酿酒酵母生L-乳酸方面已实现L-乳酸的积累,产率的提高,同时副产物明显降低。但酿酒酵母自身具有生产乙醇的特性,产出乙醇的累积对于细胞的生长具有一定的影响。同时氧气的控制对于L-乳酸的生产也具有一定的影响,乳酸生产菌株还有待进一步的开发和改造以提升L-乳酸的生产。
发明内容
为解决上述酿酒酵母产乙醇影响L-乳酸产量、氧气量调控等问题,本发明提供一种利用Cre-loxp技术引入枯草芽孢杆菌(Bacillus Subtilis)来源的乙醇脱氢酶基因adhA促使乙醇转化成乙醛,及引入布鲁氏菌(Brucellasp.)来源的乳酸醛缩酶基因BAL促使乙醛合成乳酸。并敲除乙醛脱氢酶基因ALD6阻止乙醛合成乙酸,以进一步提高酿酒酵母菌中L-乳酸产量的方法(图1)。
本发明的第一个目的是提供一种重组酿酒酵母,所述重组酿酒酵母的基因组上整合一个或多个乙醇脱氢酶编码基因adhA和乳酸醛缩酶编码基因BAL。
在一种实施方式中,敲除乙醛脱氢酶编码基因ALD6后,在ALD6位点整合adhA基因和BAL基因。
在一种实施方式中,敲除ALD6基因后,在ALD6位点整合adhA基因和BAL基因,在1622b位点整合adhA基因。
在一种实施方式中,敲除ALD6基因后,在ALD6位点整合adhA基因和BAL基因,在1622b位点整合adhA基因,在1309a位点整合BAL基因。
在一种实施方式中,所述重组酿酒酵母还敲除调控半乳糖的转录调节因子GAL80基因。
在一种实施方式中,敲除GAL80基因后,在GAL80位点整合乳酸脱氢酶编码基因LDH。
在一种实施方式中,在ALD6基因位点,所述adhA和BAL基因是通过双向半乳糖诱导启动子GAL1,10起始表达。
在一种实施方式,在1622b位点,所述adhA基因通过TEF1启动子起始表达。
在一种实施方式,在1309a位点,所述BAL基因通过BLA启动子起始表达。
在一种实施方式中,以酿酒酵母TJG16为宿主细胞,所述酿酒酵母TJG16记载于公开号为CN114854612A的专利文献中。
在一种实施方式中,所述乙醇脱氢酶adhA来源于枯草芽孢杆菌,Gene ID为938739,所述基因adhA的核苷酸序列如SEQ ID NO.1所示。
在一种实施方式中,所述乳酸醛缩酶BAL来源于布鲁氏菌,蛋白ID为EC 4.1.2.36,所述基因BAL的核酸序列如SEQ ID NO.2所示。
在一种实施方式中,所述乙醛脱氢酶编码基因ALD6的Gene ID为: 856044。
在一种实施方式中,所述调控半乳糖的转录调节因子编码基因GAL80的Gene ID为:854954。
在一种实施方式中,所述双向半乳糖诱导启动子GAL1,10的核苷酸序列如SEQ IDNO.3所示。
在一种实施方式中,乳酸脱氢酶编码基因LDH的核苷酸序列如SEQ ID NO.4所示。
在一种实施方式中,所述1309a位点的上游同源臂的核苷酸序列如SEQ ID NO.5所示,下游同源臂的核苷酸序列如SEQ ID NO.6所示;所述1622b位点的上游同源臂的核苷酸序列如SEQ ID NO.7所示,下游同源臂的核苷酸序列如SEQ ID NO.8所示。
本发明的第二个目的是提供一种生产L-乳酸的方法,利用所述重组酿酒酵母发酵生产L-乳酸。
在一种实施方式中,将所述重组酿酒酵母接种于发酵体系中,在28~35 ℃,200~220 rpm下培养80~120 h。
在一种实施方式中,将所述重组酿酒酵母培养至OD600=6±0.5,按照体积比8%~10%的量接种至15 L YPD培养基中,在28~35 ℃,200~220 rpm下培养,培养至体系中葡萄糖含量低于5 g/L时,补加葡萄糖维持体系中葡萄糖的含量20~25 g/L。
在一种实施方式中,在发酵前24 h通氧发酵,之后在葡萄糖接近耗尽时关闭氧气,厌氧发酵。
在一种实施方式中,在补加葡萄糖的同时补加CaCO3,维持发酵液的pH在4.5-5之间。
本发明的第三个目的是提供所述的重组酿酒酵母在制备L-乳酸、L-乳酸衍生物、含有L-乳酸的产品及含有L-乳酸衍生物的产品中的应用。
本发明的有益效果:
本发明以耐酸酿酒酵母TJG16作为生产菌株,在发酵有机酸过程具有酿酒酵母的耐酸性,大幅度提升了L-乳酸的产量。对酿酒酵母TJG16做了改进,具体为引入枯草芽孢杆菌来源的乙醇脱氢酶基因adhA促使乙醇转化成乙醛,及引入布鲁氏菌来源的乳酸醛缩酶基因BAL促使乙醛合成乳酸。并敲除乙醛脱氢酶基因ALD6阻止乙醛合成乙酸,敲除调控半乳糖的转录调节因子编码基因GAL80并整合乳酸脱氢酶LDH,最终实现L-LA产量的显著提升,产量从最初的47.7 g/L提升到50.5~192.3 g/L。
附图说明
图1为乙醇到乳酸代谢调控;
图2为L-LA标品高效液相图;
图3为酿酒酵母菌株TJG20发酵L-LA高效液相结果图。
具体实施方式
下面结合具体实施例对本发明作进一步说明,以使本领域的技术人员可以更好地理解本发明并能予以实施,但所举实施例不作为对本发明的限定。
(一)培养基
LEU-平板:在无氨基酸酵母氮源(YNB)培养基基础上,添加葡萄糖搭配组氨酸(HIS)、尿嘧啶和色氨酸。用于筛选带有LEU标签的基因改造菌。
HIS-平板:在无氨基酸酵母氮源(YNB)培养基基础上,添加葡萄糖搭配亮氨酸(LEU)、尿嘧啶和色氨酸,用于筛选带有HIS标签的基因改造菌。
YPD液体培养基:蛋白胨 20 g/L,酵母粉 10 g/L,葡萄糖 20 g/L。
(二)酿酒酵母的感受态制备:
(1)从YPD平板上挑取一个新鲜的重组酿酒酵母单克隆至10 ml YPD液体培养基,30℃,250 rpm培养过夜。
(2)测定过夜培养物的OD600值为3.0~5.0之间。
(3)将10 ml YPD过夜培养物稀释至OD600值为0.2~0.4。
(4)在28~30℃摇床中继续培养3~6 hr,使其OD600值达到0.6~1.0。
(5)于室温1500 g离心5 min收集酵母细胞,弃上清。
(6)用10 ml洗液洗酵母细胞,随后于室温1500 g离心5 min离心收集细胞,弃上清。
(7)用1 ml TE/LiAc重悬酵母细胞,以每管50 μl分装。
(三)酿酒酵母的转化:
(1)取50 μl感受态细胞,再加入待转质粒各2 μl,混匀。
(2)加入500 μl转化用溶液(PEG/LiAc,二甲亚砜),弹击管壁混匀。
(3)30℃水浴1 h,隔15 min弹击管壁混匀。
(4)加入1毫升YPD培养液,30℃摇床培养1小时。
(5)3500 g离心5 min,留沉淀,弃上清。
(6)沉淀用150 μl TE重悬,涂相应的SD平板;将平板倒置于30℃培养。
(四)L-乳酸的检测:
通过高效液相色谱对酿酒酵母中的L-LA进行检测,将发酵112 h的酿酒酵母菌液,取1ml加入0.5mm的玻璃珠,使用高速匀浆破碎仪破碎20 min,取出破碎后的混合液离心取上清,稀释10倍后通过0.55 μm水相膜过滤,进行高效液相色谱分析。流动相使用0.5 mM稀硫酸,流速0.6 mL/min。检测器使用紫外检测器,检测波长为210 nm,检测温度50 ℃。L-LA标准品的高效液相图如图2所示。
(五)本申请中使用的菌株酿酒酵母TJG16公开于公开号为CN114854612A的专利文献中。
实施例中所使用的引物如表1所示:
表1
实施例1:重组酿酒酵母菌TJG17的构建
将枯草芽孢杆菌来源的adhA基因(核苷酸序列如SEQ ID NO.1所示)和布鲁氏菌来源的BAL基因(核苷酸序列如SEQ ID NO.2所示)整合在酿酒酵母TJG16的ALD6位点,以实现adhA和BAL的过表达。
将酿酒酵母TJG16菌株制成酵母感受态细胞;
以酿酒酵母S288C基因组为模板,分别利用引物ALD6-U-F/R、LEU-A-F/R、TDH3-A-F/R、
ADHA-A-F/R、GAL-A-F/R、BAL-A-F/R、CYC1-A-F/R、ALD6-D-F/R(表1),扩增得到8个重组片段:ALD6-U、标签LEU、终止子TDH3、adhA、GAL1,10、BAL、终止子CYC1和ALD6-D。将得到的8个重组片段共转化至酿酒酵母TJG16感受态细胞中,涂布在LEU-平板上,在30℃下培养2~3 d至长出单菌落。利用引物A-Y-F/R、A-Y1-F/R、以及A-Y2-F/R进行验证,验证正确的菌株即为双表达adhA和BAL两个基因的阳性转化子,并命名为菌株TJG17。
实施例2:重组酿酒酵母菌TJG18~ TJG20的构建
(a)重组酿酒酵母菌TJG18的构建
将枯草芽孢杆菌来源的adhA基因(核苷酸序列如SEQ ID NO.1所示)整合在酿酒酵母TJG17的1622b位点,以实现adhA基因的多拷贝表达,促进乙醇合成乙醛。
将实施例1构建的TJG17菌株制成酵母感受态细胞;
以酿酒酵母工程菌S288C基因组为模板,采用引物1622b-U-F、1622b-U-R扩增得到基因片段1622b-U。采用引物LEU-A1-F、LEU-A1-R扩增得到标签基因片段LEU,采用TEF1-A-F、TEF1-A-R引物扩增得到TEF1启动子。采用ADHA-F、ADHA-R引物扩增得到adhA。采用引物CYC1-A1-F、CYC1-A1-R扩增基因片段得到终止子CYC1。采用引物1622b-D-F、1622b-D-R扩增得到基因片段1622b-D。将基因片段1622b-U、LEU、TEF1、adhA、CYC1、1622b-D通过化学转化方式共同转入酿酒酵母感受态细胞TJG17中,涂布在LEU-平板上,在30℃下培养2~3 d至长出单菌落。使用引物Y1-1622-U/D、Y2-1622-U/D进行菌落PCR验证,并把验证正确的菌株命名为TJG18。
(b)重组酿酒酵母菌TJG19的构建
将布鲁氏菌来源的BAL基因(核苷酸序列如SEQ ID NO.2所示)整合在酿酒酵母TJG18的1309a位点,以实现BAL基因的多拷贝表达,促进乙醛合成乳酸。
将步骤(a)构建的TJG18菌株制成酵母感受态细胞;
以酿酒酵母工程菌S288C基因组为模板,采用引物1309-U-F、1309-U-R扩增得到基因片段1309a-U。采用引物HIS-B-F、HIS-B-R扩增得到标签基因片段HIS,采用BLA-B-F、BLA-B-R引物扩增得到BLA启动子。采用BAL-F、BAL-R引物扩增得到BAL。采用引物TDH3-B-F、TDH3-B-R扩增基因片段得到终止子TDH3。采用引物1309-D-F、1309-D-R扩增得到基因片段1309-D。将基因片段1309a-U、HIS、BLA、BAL、TDH3、1309-D通过化学转化方式共同转入酿酒酵母感受态细胞TJG18中,涂布在HIS-平板上,在30℃下培养2~3 d至长出单菌落。使用引物Y1-BAL-F/R、Y2-BAL-F/R进行菌落PCR验证,最终得到菌株TJG19。
(c)重组酿酒酵母菌TJG20的构建
将乳酸脱氢酶LDH,整合至酿酒酵母TJG19的GAL80处,实现GAL80的敲除,不需要添加半乳糖启动L-乳酸的合成途径。
按照(b)相似步骤,以酿酒酵母工程菌S288C基因组为模板,采用引物GAL80-U-F、GAL80-U-R扩增得到基因片段GAL80-U,采用引物GAL80-D-F、GAL80-D-R扩增得到基因片段GAL80-D,采用引物G-HIS-F、G-HIS-R扩增得到标签基因片段HIS,采用引物G-LLDH-F、G-LLDH-R扩增得到基因片段LLDH(TEF1启动子+乳酸脱氢酶LDH+终止子CYC1),将基因片段GAL80-U、LLDH和HIS通过化学转化方式共同转入酿酒酵母感受态细胞TJG19中,涂布在HIS-平板上,在30℃下培养2~3 d至长出单菌落。并用引物Y1-G80-FR、Y2-G80-F/R进行菌落PCR验证,最终得到菌株TJG20。
实施例3:重组酿酒酵母发酵生产L-乳酸
在2 mL YPD液体培养基中分别接入从固体YPD平板上挑取的实施例1和2构建得到的酿酒酵母菌TJG17~ TJG20单菌落,在30℃,220 rpm培养18~24 h后,发酵菌株OD600值达到6左右后按10%体积比接入含有15 L YPD液体培养基的30 L发酵罐内,在30℃,220 rpm培养,在发酵前24 h通氧发酵,之后在葡萄糖接近耗尽时关闭氧气,厌氧发酵。发酵至葡萄糖<5 g/L时,加入葡萄糖进行碳源的补充,保持葡萄糖含量在20~25 g/L。在补加葡萄糖的同时补加CaCO3,维持发酵液的pH在4.5-5之间。
总共发酵112 h,发酵结束后,离心取沉淀,除去上清,使用10 mL无菌水重悬,加入0.5 mm的玻璃珠,使用高速匀浆破碎仪破碎20 min,取出破碎后的混合液,0.55 μm过滤后进行高效液相色谱分析。流动相使用稀硫酸,检测器使用紫外检测器,检测波长为210 nm,检测温度50 ℃。
经过液相分析,在TJG16基础上,构建成功的高产乳酸菌株TJG17~TJG20的L-LA产量分别为50.5 g/L,72.7 g/L,119.0 g/L,192.3 g/L(图3)。
将菌株TJG16按照上述方法发酵生产L-乳酸,经检测,L-乳酸的产量为47.7 g/L。
虽然本发明已以较佳实施例公开如上,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 (6)
1.一种重组酿酒酵母,其特征在于,以酿酒酵母TJG16为宿主细胞,敲除乙醛脱氢酶ALD6基因后,在ALD6位点整合adhA基因和BAL基因;
或,敲除ALD6基因后,在ALD6位点整合adhA基因和BAL基因,在1622b位点整合adhA基因;
或,敲除ALD6基因后,在ALD6位点整合adhA基因和BAL基因,在1622b位点整合adhA基因,在1309a位点整合BAL基因;
所述adhA基因的核苷酸序列如SEQ ID NO.1所示;所述BAL基因的核酸序列如SEQ IDNO.2所示;所述ALD6基因的Gene ID为: 856044。
2.根据权利要求1所述的重组酿酒酵母,其特征在于,所述重组酿酒酵母还敲除调控半乳糖的转录调节因子GAL80基因,所述GAL80基因的Gene ID为:854954。
3.根据权利要求2所述的重组酿酒酵母,其特征在于,敲除GAL80基因后,在GAL80位点整合乳酸脱氢酶编码基因LDH,所述乳酸脱氢酶编码基因LDH的核苷酸序列如SEQ ID NO.4所示。
4.一种生产L-乳酸的方法,其特征在于,利用权利要求1~3任一所述重组酿酒酵母发酵生产L-乳酸。
5.根据权利要求4所述的方法,其特征在于,将权利要求1~3任一所述重组酿酒酵母接种于发酵体系中,培养至OD600=6±0.5,按照体积比8%~10%的量接种至YPD培养基中,在28~35 ℃,200~220 rpm下培养,培养至体系中葡萄糖含量低于5 g/L时,补加葡萄糖维持体系中葡萄糖的含量20~25 g/L。
6.权利要求1~3任一所述重组酿酒酵母在制备L-乳酸或含有L-乳酸的产品中的应用。
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