CN106754845B - 一种panD突变基因、编码蛋白、载体、工程菌及其应用 - Google Patents
一种panD突变基因、编码蛋白、载体、工程菌及其应用 Download PDFInfo
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Abstract
本发明涉及一种panD突变基因、编码蛋白、载体、工程菌及其应用,高产L‑天冬氨酸‑α‑脱羧酶(PanD)的系列重组大肠杆菌是通过易错PCR的随机突变改变panD基因的密码子碱基而获得。利用高产PanD的基因工程菌可以高效转化L‑天冬氨酸来生物法制备β‑丙氨酸,其中,编号为6‑85的重组大肠杆菌的PanD酶活达到250U/L、β‑Ala的产量达8.5g/L左右,比亲株分别提高了近4倍和3倍。
Description
(一)技术领域
本发明涉及一种β-丙氨酸的制备,特别涉及一种利用随机突变获得系列panD突变基因、编码蛋白、载体、工程菌及其应用。
(二)背景技术
β-丙氨酸,又称β-氨基丙酸,由Ross和Monroe于1972年首次发现,是自然界中唯一的β型氨基酸。β-丙氨酸是一种重要的化工原料和医药中间体,用于泛酸钙、肌肽、甜味剂等的合成,还被用作水的净化絮凝剂、电镀缓蚀剂等。目前,β-丙氨酸的工业化生产主要通过化学法合成,根据合成原料的不同可分为丙烯腈法、丙烯酸法、琥珀酰亚胺降解法、β-氨基丙腈法等。化学合成成本高、工艺要求严苛、产生大量腈类等有毒副产物,既不利于产品的分离纯化,又会导致严重的环境污染。
L-天冬氨酸α-脱羧酶(L-aspartate-α-decarboxylase,简称PanD)能催化脱去L-天冬氨酸的α-羧基,产生β-丙氨酸和二氧化碳,因此,PanD能被用来生物法制备β-丙氨酸。上世纪七八十年代,Nakano、Williamson、Cronan等研究团队先后发现大肠杆菌能利用细胞内PanD合成β-丙氨酸,并对该酶的晶体结构和作用机理进行了研究。鉴于天然PanD的活性比较低,直接从自然界中获得产酶活力高的菌株比较困难,美国NSC技术有限公司在1996年首次通过基因重组技术,对大肠杆菌来源的panD基因进行了克隆表达,用于拆分DL-天冬氨酸。1999年,德国Dusch等人首次将谷氨酸棒杆菌来源的panD基因分别克隆到大肠杆菌和谷氨酸棒杆菌中表达。发明专利(裘娟萍、高丽娟;一种产β-丙氨酸的基因工程菌及其制备与应用;申请号:200610155551.0;申请日:2006-12-28)也公开了一株大肠杆菌panD基因在大肠杆菌中重组表达的菌株(保藏于中国典型培养物保藏中心,保藏号CCTCC NO:M206114),并用于生物法制备β-丙氨酸。
尽管panD基因的重组表达在一定程度上提高了其在生物法制备β-丙氨酸中的能力,但天然序列和结构的PanD的重组表达量和活力目前还不够高,这限制了PanD在生物法制备β-丙氨酸中的应用。针对这个问题,国内外研究人员对panD基因进行了定点突变,以期研究PanD序列与功能的关系,为提高PanD的活力提供理论基础。定点突变是一种基于理性设计的分子改造。理性设计改善酶蛋白的酶学性质需要基于对蛋白的结构、功能和催化机制的掌握,根据蛋白的空间结构知识确定关键氨基酸位点进行取代、插入和缺失突变。因此,有效的理性设计需要大量的酶蛋白的信息、丰富的生物、物理和化学等学科知识储备及开阔的思维方式,往往难度较大;而且定点突变每次只有少数位点发生突变,对酶学性质的改造有限。相对而言,基于易错PCR的随机突变可在特定编码序列的多个位点产生随机突变,事先不需要对所改造蛋白的结构、功能和催化机制有深入了解,故其是一种较为理想的蛋白质定向进化方法。到目前为止,还未见用易错PCR的随机突变对PanD进行分子改造获得高活力PanD酶应用于β-丙氨酸的制备。
(三)发明内容
本发明目的是用易错PCR的随机突变改变panD基因的密码子碱基,从而提高重组大肠杆菌PanD的表达量,提供一系列panD突变基因和编码蛋白及提供一种高产PanD、制备β-丙氨酸的方法。
为了达到本发明的目的采用的技术方案是:
本发明提供一种panD突变基因,所述panD突变基因的核苷酸序列为SEQ ID NO.1、SEQ ID NO.2、SEQ ID NO.3、SEQ ID NO.4、SEQ ID NO.5和SEQ ID NO.6之一所示,对应的panD突变基因所编码蛋白的氨基酸序列分别为SEQ ID NO.7、SEQ ID NO.8、SEQ ID NO.9、SEQ ID NO.10、SEQ ID NO.11和SEQ ID NO.12所示。
本发明还涉及一种所述panD突变基因构建的重组载体及重组载体转化制备的重组基因工程菌。
此外,本发明还提供一种所述panD突变基因编码蛋白在生物法制备β-丙氨酸中的应用,所述应用以含panD突变基因的重组基因工程菌经发酵培养获得的湿菌体为酶源,以L-天冬氨酸为底物,以pH值为6~8(优选为7.0)的水为反应介质构成反应体系,于25~80℃,50~250rpm摇床转化12~72h(优选37℃、200rpm摇床转化48h),使L-天冬氨酸脱羧,产生β-丙氨酸,转化结束,转化液分离纯化,获得β-丙氨酸。
进一步,所述湿菌体用量以反应体系体积计为2~50g/L,优选2g/L;所述底物终浓度以反应体系体积计为0.01~5mol/L,优选0.2mol/L。
进一步,所述酶源按如下步骤制备:(1)斜面培养:将含panD突变基因的重组大肠杆菌接种于斜面培养基,20~37℃培养12~24h(优选37℃培养12h),获得斜面菌体,所述斜面培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,琼脂15~25g/L,pH6~8,溶剂为水;优选所述斜面培养基终浓度组成为:酵母膏3g/L,蛋白胨5g/L,琼脂20g/L,pH7,溶剂为水;(2)种子培养:从斜面菌体挑取一接种环菌株接种至种子培养基,20~37℃、100~250rpm摇床培养12~36h(优选37℃、200rpm摇床培养16h),获得种子液,所述种子培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,pH6~8,溶剂为水;优选所述种子培养基终浓度组成为:酵母膏5g/L,蛋白胨10g/L,pH 7,溶剂为水;(3)发酵培养:将种子液以体积浓度1~10%(优选2%)的接种量接种至发酵培养基,20~37℃、100~250rpm摇床培养至OD600为0.2~1.0(优选37℃、200rpm摇床培养至OD600为0.6),加乳糖至终浓度2~5g/L(优选3.5g/L),继续培养4~48h(优选12h),获得发酵液,将发酵液在5000~12000rpm离心2~10min(优选8000rpm离心5min)后,弃去上清,收集细胞,获得所述酶源;所述发酵培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,pH6~8,溶剂为水;优选所述发酵培养基终浓度组成为:酵母膏6g/L,蛋白胨12g/L,pH7,溶剂为水。
本发明所述panD突变基因是以大肠杆菌BL21(DE3)/pET28b(+)-panD中panD基因为亲株A进行易错PCR反应,随机突变改变L-天冬氨酸-α-脱羧酶(PanD)基因的密码子碱基,筛选出PanD酶活和β-Ala产量与亲株A相比明显提高的突变株。易错PCR随机突变改变panD基因的密码子碱基的位置包含但不限于第10、90、114、212、253、286、306和321位。最终筛选获得突变株1-20、2-30、2-36、3-48、4-133、6-83和6-85,抽提质粒,并送上海生工生物工程技术服务有限公司测序确定突变的panD基因序列,分别发现突变株1-20第10位碱基A变成G(SEQ ID NO.1),相应的氨基酸由苏氨酸变成丙氨酸(SEQ ID NO.7);突变株2-30第212位碱基T变成C(SEQ ID NO.2),相应的氨基酸由缬氨酸变成丙氨酸(SEQ ID NO.8);突变株2-36第306位碱基A变成T(SEQ ID NO.3),尽管氨基酸没变(SEQ ID NO.9),但密码子稀有度发生了变化;突变株3-48第254位碱基T变成了C及第286位碱基G变成了A(SEQ ID NO.4),相应的氨基酸分别由缬氨酸变成了丙氨酸、谷氨酸变成了赖氨酸(SEQ ID NO.10);突变株4-133第90位碱基G变成了A及第321碱基T变成了C,尽管相应的氨基酸没变,但密码子稀有度发生了变化,另外,第253位碱基G还变成了T(SEQ ID NO.5),相应的氨基酸由缬氨酸变成了异亮氨酸(SEQ ID NO.11);突变株6-83和6-85都是第114位碱基T变成了A(SEQ ID NO.6),尽管氨基酸没变(SEQ ID NO.12),但通过RNA结构预测网站RNA Structure Webservers分别对亲株A和PanD表达最高突变株6-85的panD基因的mRNA进行二级结构预测,发现亲株A的panD基因的mRNA在114位碱基未形成发卡结构,而突变株6-85的panD基因mRNA的114位碱基形成了发卡结构。发夹结构会引起mRNA自由能的增加,从而提高mRNA的稳定性,由此提高目的蛋白的表达量。
本发明的有益效果主要体现在:本发明提供了一系列新的高产PanD的panD突变基因、编码蛋白及工程菌,利用所获工程菌高效转化L-Asp来制备β-Ala;初步的研究发现,其中活力最高的重组大肠杆菌6-85所产PanD的酶活近250U/L、β-Ala的产量达8.5g/L左右,而亲株A所产PanD的酶活仅为50U/L、β-Ala的产量为2.5g/L左右,分别提高了4倍和3倍。应用易错PCR技术对panD基因进行随机突变改造,获得了一系列PanD酶活明显提高的重组大肠杆菌,育种目标明确、效率高。
(四)附图说明
图1为亲株A(A)和代表性高产株大肠杆菌6-85(B)的panD基因在114位碱基附近mRNA二级结构预测结果;
图2为亲株A和PanD高产株所产PanD酶活和L-Asp转化率的比较。
(五)具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此:
实施例1:大肠杆菌panD基因突变体库的构建
(1)含大肠杆菌panD基因的pET28b(+)-panD质粒的获得:将大肠杆菌BL21(DE3)/pET28b(+)-panD即亲株A(保藏号CCTCC NO:M206114,已在专利申请CN101210230A中公开)接种于LB液体培养基中,于37℃、200rpm转速下摇床培养12h,8000rpm离心5min,收集菌体细胞,用质粒抽提试剂盒(购自上海生工生物工程技术服务有限公司)抽提质粒pET28b(+)-panD;取2μL质粒DNA用ND5000超微量紫外可见分光光度计(美国Bioteke公司)测定样品的浓度和纯度;LB液体培养基组成为:蛋白胨10g/L,酵母粉5g/L,氯化钠5g/L,pH7.0,卡那霉素50μg/mL,以水为溶剂。
(2)易错PCR反应的建立:(a)设计含有限制性酶切位点的正向引物(YCpanD-F:5’GACAGCAAATGGGTCGGGATCCTATGAT3’,下划线为BamH I酶切位点)和反向引物(YCpanD-R:5’GCTCGAGTGCGGCCGCAAGCTTAGCAAC3’,下划线为Hind III酶切位点);(b)配制50μL的PCR反应混合液,内含(终浓度):1×Taq DNA聚合酶缓冲液,1.0mmol/L Mn2+,0.12mmol/L dGTP,0.12mmol/L dATP,1.0mmol/L dCTP,1.0mmol/L dTTP,0.2μmol/L上游引物YCpanD-F,0.2μmol/L下游引物YCpanD-R,2ng/μL模板pET28b(+)-panD和0.1U/μL Taq DNA聚合酶,其余为无菌水;(c)将PCR反应混合液置于PCR仪上进行易错PCR扩增panD基因,扩增程序为:95℃变性10min,然后是35个循环,每个循环包括95℃变性60s,62℃退火45s,72℃延伸60s,循环结束后,72℃再延伸5min,然后保存在4℃下。扩增结束后,用浓度为1.5%琼脂糖凝胶电泳确证PCR产物大小;
(3)panD基因突变体库的构建:(a)用DNA纯化试剂盒纯化PCR扩增产物;取2μL纯化后PCR产物用ND5000超微量紫外可见分光光度计测定样品的浓度和纯度;(b)配制100μL的酶切反应混合液,用限制性内切酶BamH I和Hind III对步骤(a)的易错PCR产物和pET28b(+)载体分别进行双酶切,内含(终浓度):1×Buffer K,50ng/μL易错PCR产物DNA或pET28b(+),1U/μL BamH I和1U/μL Hind III,其余为无菌水;于37℃水浴中酶切4h;(c)将酶切产物在浓度为1.5%琼脂糖凝胶上电泳,验证酶切效果,并将目的片段切胶,分别用DNA凝胶回收试剂盒回收;取2μL回收产物用ND5000超微量紫外可见分光光度计测定样品的浓度和纯度;(d)用牛小肠碱性磷酸酶(CIAP)对酶切后线性化pET28b(+)载体进行去磷酸化处理,防止载体自连。配置50μL线性化pET28b(+)载体去磷酸化反应混合液,内含(终浓度):1×Alkalin Phosphatase Buffer,0.05pmol/μL pET28b(+)双酶切纯化产物,1U/μL CIAP,其余为无菌水;于37℃水浴中反应4h。用DNA纯化试剂盒纯化去磷酸化的产物,并取2μL纯化后产物用ND5000超微量紫外可见分光光度计测定样品的浓度和纯度;(e)配置10μL的连接反应混合液,内含(终浓度):1×T4Ligation Buffer,2ng/μL步骤(d)获得的双酶切后pET28b(+),6ng/μL步骤(c)获得的双酶切易错PCR产物,10U/μL T4 DNA Ligase,其余为无菌水;于16℃水浴中反应12h。按TaKaRa公司高效感受态细胞制备试剂盒说明书手册制备感受态大肠杆菌BL21(DE3);按《分子克隆实验指南》将连接产物转化至100μL大肠杆菌BL21(DE3)感受态细胞,涂布至LB固体培养基平板(蛋白胨10g/L,酵母粉5g/L,氯化钠5g/L,pH7.0,卡那霉素50μg/mL,以水为溶剂),在37℃下正向放置1h以吸收过多的液体,然后倒置培养过夜;(f)将转化平板上长出的所有转化子单菌落挑至含50μg/mL卡那霉素的LB固体培养基平板上并划线,于37℃恒温培养箱倒置培养过夜。将长出的所有转化子用引物对YCpanD-F和YCpanD-R进行普通菌落PCR(《分子克隆实验指南》)鉴定,获得panD基因突变体库。
实施例2:高产PanD的基因工程菌的获得
将实施例1构建的突变体库中的转化子和亲株A分别接入3mL LB液体培养基中,加乳糖至终浓度3g/L,于37℃、200rpm转速下摇床培养1d。培养结束后,取1.5mL培养液至EP管中,8000r/min、4℃离心10min,收集细胞。加入300μL L-Asp使其终浓度为0.2mol/L,混匀后,于37℃,200rpm摇床转化12h。取50μL转化液按专利申请CN101210230A中所述的HPLC方法检测β-Ala和L-Asp含量,计算转化率,筛选出PanD酶活和β-Ala产量与亲株A相比明显提高的突变株。PanD酶活定义为在pH7.0、37℃的条件下,每升发酵液所得菌体每1h转化生成1μmol产物β-Ala所需酶量定义为一个酶活力单位(μmol·L-1·h-1),简称为U。
式中,N为转化液β-Ala浓度(g/L);V为转化液体积(L);T为转化时间(h),V’为发酵液体积(L);M为β-Ala分子量(g/mol)。
结果如表1所示,共有7株突变株(1-20、2-30、2-36、3-48、4-133、6-83和6-85)的β-Ala产量和PanD酶活相较于亲株A有明显提高(提高30%以上),其中,突变株6-85提高的最多。
表1突变株HPLC检测结果
注:菌株编号亲株A-1~亲株A-6表示不同批次发酵结果;加粗为筛选得到的高产菌
实施例3:PanD高产突变株panD基因序列的分析
将实施例2筛选的突变株1-20、2-30、2-36、3-48、4-133、6-83和6-85所含质粒按实施例1所述抽提方法获得,并送上海生工生物工程技术服务有限公司测序确定突变的panD基因序列,并用DNAman软件进行序列比对;突变位点密码子对应tRNA丰度通过Codon UsageDatabase查询获得,结果见表2。突变株1-20panD基因的核苷酸序列为SEQ ID NO.1所示,编码蛋白氨基酸序列为SEQ ID NO.7所示;突变株2-30panD基因的核苷酸序列为SEQ ID NO.2所示,编码蛋白氨基酸序列为SEQ ID NO.8所示;突变株2-36panD基因的核苷酸序列为SEQID NO.3所示,编码蛋白氨基酸序列为SEQ ID NO.9所示;突变株3-48panD基因的核苷酸序列为SEQ ID NO.4所示,编码蛋白氨基酸序列为SEQ ID NO.10所示;突变株4-133panD基因的核苷酸序列为SEQ ID NO.5所示,编码蛋白氨基酸序列为SEQ ID NO.11所示;突变株6-83和突变株6-85panD基因的核苷酸一样,序列为SEQ ID NO.6所示,编码蛋白氨基酸序列为SEQ ID NO.12所示。
表2突变株panD突变位点分析
由表可见,突变株1-20第10位碱基A变成G,相应的氨基酸由苏氨酸变成丙氨酸;突变株2-30第212位碱基T变成C,相应的氨基酸由缬氨酸变成丙氨酸;突变株2-36第306位碱基A变成T,尽管氨基酸没变,但密码子稀有度发生了明显变化;突变株3-48第254位碱基T变成了C及第286位碱基G变成了A,相应的氨基酸分别由缬氨酸变成了丙氨酸、谷氨酸变成了赖氨酸;突变株4-133第90位碱基G变成了A及第321碱基T变成了C,尽管相应的氨基酸没变,但密码子稀有度发生了变化,另外,第253位碱基G还变成了T,相应的氨基酸由缬氨酸变成了异亮氨酸;突变株6-83和6-85都是第114位碱基T变成了A,尽管氨基酸没变,但通过RNA结构预测网站RNA Structure Webservers分别对亲株A和PanD表达最高突变株6-85的panD基因的mRNA进行二级结构预测,结果(图1)发现,亲株A的panD基因的mRNA在114位碱基未形成发卡结构,而突变株6-85的panD基因mRNA的114位碱基形成了发卡结构。发夹结构会引起mRNA自由能的增加,从而提高mRNA的稳定性,由此提高突变株6-83和6-85中PanD蛋白的表达量。
实施例4:PanD重组大肠杆菌在制备β-Ala中的应用
(1)酶源的制备:(a)斜面培养:将实施例2构建的重组大肠杆菌6-85接种于斜面培养基,37℃培养12h,获得斜面菌体,所述斜面培养基终浓度组成为:酵母膏3g/L,蛋白胨5g/L,琼脂20g/L,pH7,溶剂为水;(b)种子培养:从斜面菌体挑取一接种环菌株接种至种子培养基,37℃、200rpm摇床培养16h,获得种子液,所述种子培养基终浓度组成为:酵母膏5g/L,蛋白胨10g/L,pH 7,溶剂为水;(c)发酵培养:将种子液以体积浓度2%的接种量接种至发酵培养基,37℃、200rpm摇床培养至OD600为0.6,加乳糖至终浓度3.5g/L,继续培养12h,获得PanD重组大肠杆菌发酵液;将1.5mL发酵液在8000rpm离心5min后,弃去上清,收集湿菌体细胞;所述发酵培养基终浓度组成为:酵母膏6g/L,蛋白胨12g/L,pH7,溶剂为水。同样条件下,接种亲株A、重组大肠杆菌1-20、重组大肠杆菌2-30、重组大肠杆菌2-36、重组大肠杆菌3-48、重组大肠杆菌4-133和重组大肠杆菌6-83,分别获得发酵液。
(2)L-Asp的转化:6mg湿菌体中加入300μL L-Asp(用水配置,NaOH调pH至7.0)重悬细胞,并使L-Asp终浓度为0.2mol/L,混匀后,于37℃,200rpm摇床转化12h。取50μL转化液用HPLC方法检测β-Ala和L-Asp含量,计算PanD酶活和L-Asp的转化率,结果如图2所示。
由图2可知,亲株A的PanD酶活和L-Asp的转化率分别为27U/L和5.3%,而重组大肠杆菌1-20、2-30、2-36、3-48、4-133、6-83和6-85的PanD酶活和L-Asp的转化率都比亲株A高,尤其是重组大肠杆菌6-85,其PanD酶活和L-Asp的转化率分别为120U/L和20.6%,比亲株A提高了近4倍和3倍。
SEQUENCE LISTING
<110> 浙江工业大学
<120> 一种panD突变基因、编码蛋白、载体、工程菌及其应用
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atgattcgcg cgatgctgca gggcaaactc caccgcgtga aagtgactca tgcggacctg 60
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gtcggcgata ttgtcatcat cgccagcttc gttaccatgc cagatgaaga agctcgcacc 300
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atgattcgca cgatgctgca gggcaaactc caccgcgtga aagtgactca tgcggacctg 60
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gcggcagaac gcggttcgag aattatttct gttaacggtg cggcggccca ctgcgccagt 240
gtcggcgata ttgccatcat cgccagcttc gttaccatgc cagataaaga agctcgcacc 300
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atgattcgca cgatgctgca gggcaaactc caccgcgtga aagtgactca tgcggacctg 60
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aacgaagcca ttgatatctg gaatgtcacc aacggcaagc gtttctccac ttatgccatc 180
gcggcagaac gcggttcgag aattatttct gttaacggtg cggcggccca ctgcgccagt 240
gtcggcgata ttttcatcat cgccagcttc gttaccatgc cagatgaaga agctcgcacc 300
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<400> 6
atgattcgca cgatgctgca gggcaaactc caccgcgtga aagtgactca tgcggacctg 60
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gcggcagaac gcggttcgag aattatttct gttaacggtg cggcggccca ctgcgccagt 240
gtcggcgata ttgtcatcat cgccagcttc gttaccatgc cagatgaaga agctcgcacc 300
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Met Ile Arg Ala Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
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Glu Met Lys Arg Thr Ala Lys Ala Ile Pro Val Gln Val Ala
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<210> 8
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<212> PRT
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<223> 人工序列
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Met Ile Arg Thr Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
1 5 10 15
His Ala Asp Leu His Tyr Glu Gly Ser Cys Ala Ile Asp Gln Asp Phe
20 25 30
Leu Asp Ala Ala Gly Ile Leu Glu Asn Glu Ala Ile Asp Ile Trp Asn
35 40 45
Val Thr Asn Gly Lys Arg Phe Ser Thr Tyr Ala Ile Ala Ala Glu Arg
50 55 60
Gly Ser Arg Ile Ile Ser Ala Asn Gly Ala Ala Ala His Cys Ala Ser
65 70 75 80
Val Gly Asp Ile Val Ile Ile Ala Ser Phe Val Thr Met Pro Asp Glu
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<210> 9
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<220>
<223> 人工序列
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Met Ile Arg Thr Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
1 5 10 15
His Ala Asp Leu His Tyr Glu Gly Ser Cys Ala Ile Asp Gln Asp Phe
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Val Thr Asn Gly Lys Arg Phe Ser Thr Tyr Ala Ile Ala Ala Glu Arg
50 55 60
Gly Ser Arg Ile Ile Ser Val Asn Gly Ala Ala Ala His Cys Ala Ser
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<210> 10
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<212> PRT
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<223> 人工序列
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Met Ile Arg Thr Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
1 5 10 15
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35 40 45
Val Thr Asn Gly Lys Arg Phe Ser Thr Tyr Ala Ile Ala Ala Glu Arg
50 55 60
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65 70 75 80
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<210> 11
<211> 126
<212> PRT
<213> unknown
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<223> 人工序列
<400> 11
Met Ile Arg Thr Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
1 5 10 15
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20 25 30
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35 40 45
Val Thr Asn Gly Lys Arg Phe Ser Thr Tyr Ala Ile Ala Ala Glu Arg
50 55 60
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65 70 75 80
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115 120 125
<210> 12
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<212> PRT
<213> unknown
<220>
<223> 人工序列
<400> 12
Met Ile Arg Thr Met Leu Gln Gly Lys Leu His Arg Val Lys Val Thr
1 5 10 15
His Ala Asp Leu His Tyr Glu Gly Ser Cys Ala Ile Asp Gln Asp Phe
20 25 30
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35 40 45
Val Thr Asn Gly Lys Arg Phe Ser Thr Tyr Ala Ile Ala Ala Glu Arg
50 55 60
Gly Ser Arg Ile Ile Ser Val Asn Gly Ala Ala Ala His Cys Ala Ser
65 70 75 80
Val Gly Asp Ile Val Ile Ile Ala Ser Phe Val Thr Met Pro Asp Glu
85 90 95
Glu Ala Arg Thr Trp Arg Pro Asn Val Ala Tyr Phe Glu Gly Asp Asn
100 105 110
Glu Met Lys Arg Thr Ala Lys Ala Ile Pro Val Gln Val Ala
115 120 125
Claims (7)
1.一种panD突变基因,其特征在于所述panD突变基因的核苷酸序列为SEQ ID NO.1、SEQ ID NO.2、SEQ ID NO.3、SEQ ID NO.4、SEQ ID NO.5和SEQ ID NO.6之一所示。
2.一种权利要求1所述panD突变基因构建的重组载体。
3.一种权利要求2所述重组载体转化制备的重组基因工程菌。
4.一种权利要求1所述panD突变基因在生物法制备β-丙氨酸中的应用。
5.如权利要求4所述的应用,其特征在于所述应用以含panD突变基因的重组基因工程菌经发酵培养获得的湿菌体为酶源,以L-天冬氨酸为底物,以pH值为6~8的水为反应介质构成反应体系,于25~80℃,50~250rpm摇床转化12~72h,转化液分离纯化,获得β-丙氨酸。
6.如权利要求5所述应用,其特征在于所述湿菌体用量以反应体系体积计为2~50g/L,所述底物终浓度以反应体系体积计为0.01~5mol/L。
7.如权利要求5所述应用,其特征在于所述酶源按如下步骤制备:(1)斜面培养:将含panD突变基因的重组基因工程菌接种于斜面培养基,20~37℃培养12~24h,获得斜面菌体;所述斜面培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,琼脂15~25g/L,pH6~8,溶剂为水;(2)种子培养:从斜面菌体挑取一接种环菌株接种至种子培养基,20~37℃、100~250rpm摇床培养12~36h,获得种子液;所述种子培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,pH6~8,溶剂为水;(3)发酵培养:将种子液以体积浓度1~10%的接种量接种至发酵培养基,20~37℃、100~250rpm摇床培养至OD600为0.2~1.0,加乳糖至终浓度2~5g/L,继续培养4~48h,获得发酵液,将发酵液在5000~12000rpm离心2~10min后,弃去上清,收集湿菌体,获得所述酶源;所述发酵培养基终浓度组成为:酵母膏1~10g/L,蛋白胨2~15g/L,pH6~8,溶剂为水。
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