CN117343950A - 一种提高里氏木霉表达外源蛋白表达水平的方法 - Google Patents
一种提高里氏木霉表达外源蛋白表达水平的方法 Download PDFInfo
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Abstract
本发明涉及生物技术领域,具体涉及一种提高里氏木霉表达外源蛋白表达水平的方法。本发明通过在里氏木霉中将AnMan5A的信号肽分别替换为里氏木霉的hfb2(Tr119989)信号肽、cel74A(Tr49081)信号肽以及构巢曲霉来源的果胶裂解酶A前体(An2331)信号肽,获得了AnMan5A活性显著提高的转化子。转化子在MM‑2%Avicel‑1%麸皮中培养7天后,与SUS7‑P1菌株相比较,SUS7‑S1、SUS7‑S2、SUS7‑S3菌株的AnMan5A活性分别是出发菌株SUS7‑P1的2.76倍、3.06倍和2.81倍。
Description
技术领域
本发明涉及生物技术领域,具体涉及一种提高里氏木霉表达外源蛋白表达水平的方法。
背景技术
里氏木霉作为主要的丝状真菌之一,具有强大的分泌纤维素酶的能力。工业上,经改造后的里氏木霉,其产纤维素酶的产量可达到100 g/L以上,在分泌的蛋白中,CBH1占到了总蛋白含量的60%,随着丝状真菌基因组学领域的快速发展,利用里氏木霉表达异源蛋白也越来越受到重视,目前,已成功表达和生产了多种酶制剂。
丝状真菌表达系统作为细胞工厂,具有高表达量、高分泌率,发酵成本低等优势,同时蛋白质分子折叠和修饰系统接近高等真核细胞等特点,为其投入工业化生产奠定了良好基础,另外米曲霉、黑曲霉和里氏木霉都是FDA认证的食品安全菌株,并已长期应用于食品及食品加工业。
虽然里氏木霉已作为细胞工厂广泛用于重组蛋白的生产,但与内源蛋白相比,外源蛋白的生产水平往往很低。影响外源蛋白生产的因素包括宿主的防御系统,外源基因在宿主中转录、翻译及翻译后修饰及分泌途径等多个方面。
信号肽是广泛存在于真核和原核生物中的一条长度为3到30个氨基酸的短肽,一般位于蛋白质的N端,其中包括疏水区、信号肽的C端和N端等3部分,具有负责引导蛋白跨膜运输的功能。目前在里氏木霉中广泛使用的信号肽有外切葡聚糖酶Ⅰ基因cbh1信号肽、外切葡聚糖酶Ⅱ基因cbh2信号肽、内切葡聚糖酶Ⅱ基因eg2信号肽。使用这些基因的信号肽是因为这些基因在里氏木霉分泌的蛋白中表达水平比较高,但是,目前没有对信号肽序列进行过系统化、规模化的筛选研究。因此,里氏木霉中广泛使用的信号肽可能并非是外源蛋白的最适分泌信号。
发明内容
本发明的目的是提供一种提高里氏木霉表达外源蛋白表达水平的方法。
根据本发明的提高里氏木霉表达外源蛋白表达水平的方法,所述方法包括使用里氏木霉的hfb2信号肽、cel74A信号肽以及构巢曲霉来源的果胶裂解酶A前体信号肽作为在里氏木霉中表达外源蛋白的信号肽的步骤,其中,所述hfb2信号肽的氨基酸序列如SEQ IDNO:2所示,所述cel74A信号肽的氨基酸序列如SEQ ID NO:3所示,果胶裂解酶A前体信号肽的氨基酸序列如SEQ ID NO:4所示。
根据本申请的提高里氏木霉表达外源蛋白表达水平的方法,其中,所述外源蛋白为黑曲霉来源的甘露聚糖酶AnMan5A。
本发明通过在里氏木霉中将AnMan5A的信号肽分别替换为里氏木霉的hfb2(Tr119989)信号肽、cel74A(Tr49081)信号肽以及构巢曲霉来源的果胶裂解酶A前体(An2331)信号肽,获得了AnMan5A活性显著提高的转化子。转化子在MM-2%Avicel-1%麸皮中培养7天后,与SUS7-P1菌株相比较,SUS7-S1、SUS7-S2、SUS7-S3菌株的AnMan5A活性分别是出发菌株SUS7-P1的2.76倍、3.06倍和2.81倍。
附图说明
图1-1、图1-2、图1-3、图1-4、图1-5分别为pAnMan5A-S1、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5重组表达质粒图谱;
图2显示PCR鉴定cel3c(LA)-AnMan5A-G418-cel3c(RA)片段定点整合至里氏木霉基因组中cel3c位点;
图3为 SUS7-P1和SUS7-S1、SUS7-S2、SUS7-S3、SUS7-S4、SUS7-S5的甘露聚糖酶活性汇总图。
具体实施方式
根据本发明的具体实施方式,以黑曲霉来源的甘露聚糖酶AnMan5A(SEQ ID No:1)为例,将里氏木霉表达异源蛋白常用的cbh1(Tr123989)信号肽替换为里氏木霉的hfb2(Tr119989)信号肽、cel74A(Tr49081)信号肽、构巢曲霉来源的果胶裂解酶A前体(An2331)信号肽、黑曲霉来源的葡糖淀粉酶(A.niger 134058219)、构巢曲霉来源的二乙酰基二肽酶(A.nidulans 2572),从而提高里氏木霉表达外源基因的能力。
pAnMan5A-S1、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5质粒构建是通过无缝拼接的方法,将线性化的pAnMan5A-S1、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5片段重组连接。pAnMan5A-S1 、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5的质粒构建示意图如图1-1、图1-2、图1-3、图1-4、图1-5所示。其中,对于pAnMan5A-S1,AnMan5A信号肽序列为hfb2(Tr119989)(SEQ ID No:2),对于pAnMan5A-S2,AnMan5A信号肽序列为cel74A(Tr49081)(SEQ ID No:3),对于pAnMan5A-S3,AnMan5A信号肽序列为果胶裂解酶A前体(An2331)(SEQ ID No:4),对于pAnMan5A-S4(SEQ ID No:5),AnMan5A信号肽序列来源于A.niger 134058219(msfrsllalsglvctgla),对于pAnMan5A-S5,AnMan5A信号肽序列来源于A.nidulans 2572(mgalrwlslaaaassala)(SEQ ID No:6)。
所述构建方法为:设计引物,以质粒pAnMan5A-P1为模板扩增线性化的载体片段pAnMan5A-S1、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5。PCR结束后,通过琼脂糖凝胶电泳粗略鉴定PCR扩增的片段是否正确,回收该片段,再参照无缝拼接试剂盒的说明方法,分别将线性化的载体片段进行重组连接。挑取筛选平板上的阳性克隆,通过PCR及质粒测序的方法验证质粒pAnMan5A-S1 、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5是否构建成功。
所述发酵重组转化子以生产AnMan5A的方法是,将重组转化子接种于土豆培养基(PDA)平板上产孢,将1×107孢子接种到30 mL以葡萄糖作为唯一碳源的MM-2%glucose培养基中,并于28℃,200 rpm培养36h。取5mL菌丝转移至50 mL MM-2%Avicel-1%麸皮培养基中,继续于28℃, 200 rpm培养7天。
所述MM培养基的成分包括:(NH4)2SO4,5.0 g/L;KH2PO4,15.0 g/L;MgSO4·7H2O,0.6 g/L;CaCl2·2H2O,0.6 g/L;CoCl2·6H2O,0.0037 g/L;FeSO4·7H2O,0.005 g/L;ZnSO4·7H2O,0.0014 g/L;MnSO4·H2O,0.0016 g/L。
实施例1.重组质粒pAnMan5A-S1 、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5的构建
以质粒pAnMan5A-P1为模板,该质粒中AnMan5A的信号肽序列为cbh1信号肽,序列以引物对man5A-F( SEQ ID No:7)和S1-R(SEQ ID No:8)扩增线性化载体pAnMan5A-S1,得到AnMan5A 信号肽序列为hfb2(Tr119989)的线性化载体pAnMan5A-S1。
以质粒pAnMan5A-P1为模板,以引物对man5A-F和S2-R(SEQ ID No:9)扩增线性化载体pAnMan5A-S2,得到 AnMan5A信号肽序列为cel74A(Tr49081)的线性化载体pAnMan5A-S2。
以质粒pAnMan5A-P1为模板,以引物对man5A-F和S3-R(SEQ ID No:10)扩增线性化载体pAnMan5A-S3,得到AnMan5A信号肽序列为果胶裂解酶A前体(An2331)的线性化载体pAnMan5A-S3。
以质粒pAnMan5A-P1为模板,以引物对man5A-F和S4-R(SEQ ID No:11)扩增线性化载体pAnMan5A-S4,得到 AnMan5A信号肽序列为A.niger 134058219的线性化载体pAnMan5A-S4。
以质粒pAnMan5A-P1为模板,以引物对man5A-F和S5-R(SEQ ID No:12)扩增线性化载体pAnMan5A-S5,得到 AnMan5A信号肽序列为A.nidulans 2572的线性化载体pAnMan5A-S5。
在1 %琼脂糖胶上电泳,切下PCR产物中的目的条带,纯化DNA。纯化片段后,并按照无缝拼接试剂盒说明书将线性化的载体片段自我连接。连接片段转化至Trans1-T1感受态细胞 ,在含有100 μg/ml氨苄青霉素的固体LB培养基平板上筛选获得阳性转化子。挑克隆至5 ml含有100 μg/ml的氨苄青霉素的液体LB培养基上过夜培养,提取质粒,测序验证获得pAnMan5A-S1 、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5质粒。
分别以pAnMan5A-S1 、pAnMan5A-S2、pAnMan5A-S3、pAnMan5A-S4、pAnMan5A-S5质粒为模板,用LA(cel3c)-F(SEQ ID No:13)/RA(cel3c)-R(SEQ ID No:14)扩增cel3c(LA)-AnMan5A(S1)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S2)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S3)-G418-cel3c(RA)片段、cel3c(LA)-AnMan5A(S4)-G418-cel3c(RA)片段、cel3c(LA)-AnMan5A(S5)-G418-cel3c(RA)片段。
其中cel3c(LA)-AnMan5A(S1/S2/S3/S4/S5)-G418-cel3c(RA)片段包括cel3c位点的左侧同源臂、cbh1px启动子、AnMan5A(S1/S2/S3/S4/S5)、cbh1终止子(600bp)、G418表达框和cel3c位点的右侧同源臂,其中AnMan5A(S1)的信号肽序列为hfb2(Tr119989)、AnMan5A(S2)的信号肽序列为cel74A (Tr49081)、AnMan5A(S3)的信号肽序列为果胶裂解酶A前体(An2331)、AnMan5A(S4)的信号肽序列来源于A.niger 134058219、AnMan5A(S5)的信号肽序列来源于A.nidulans 2572。
在1 %琼脂糖胶上电泳,切下PCR产物中的目的条带,纯化DNA片段备用于转化。
实施例2. 将片段cel3c(LA)-AnMan5A(S1/S2/S3/S4/S5)-G418-cel3c(RA)转化入里氏木霉及筛选
里氏木霉SUS7的转化
将里氏木霉SUS7接种于土豆培养基(PDA)平板上,28 ℃培养箱培养5 d待其产孢,将孢子刮下并接种于铺有玻璃纸的PDA平板上,28 ℃培养16h。刮取萌发的菌丝,加入10mg/ml的Lysing enzymes,30 ℃消化2小时。收集原生质体后,将片段cel3c(LA)-AnMan5A(S1)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S2)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S3)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S4)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S5)-G418-cel3c(RA)分别转入里氏木霉SUS7菌株。
转化子在含100 μg/mL G418、0.44M蔗糖的MM-2%glucose琼脂培养基上生长、选择。挑取单个克隆,接种到含100 μg/mL G418的PDA培养基上,28 ℃、培养2 d。提取基因组DNA,通过PCR验证cel3c(LA)-AnMan5A(S1)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S2)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S3)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S4)-G418-cel3c(RA)、cel3c(LA)-AnMan5A(S5)-G418-cel3c(RA)片段已经成功定点整合至里氏木霉基因组cel3c位点。转化子SUS7-S1、SUS7-S2、SUS7-S3、SUS7-S4、SUS7-S5的验证引物如下:VF(SEQ ID No:15) 和VR( SEQ ID No:16),其中VF引物是cel3c(LA)-AnMan5A(S1/S2/S3/S4/S5)-G418-cel3c(RA)片段G418表达框上的一段序列,VR引物是里氏木霉cel3c位点右侧同源臂侧翼上的一段序列。
在1 %琼脂糖胶上电泳,有多个转化子出现和预期一致大小的DNA条带(如图2所示)。因此,这些转化子是将AnMan5A定点整合到cel3c位点的阳性转化子。将这些转化子接种于PDA培养基上,28℃培养5 d产孢,收集孢子备用。
实施例3. 转化子的诱导培养和甘露聚糖酶活性测定
将对照菌株SUS7-P1(该菌株中AnMan5A的信号肽序列为cbh1信号肽序列)的孢子和各转化子的孢子接种于30 mL MM-2%glucose培养基中。28℃、200 rpm振荡培养36h。取5mL菌丝接种于50 mL MM-2%Avicel-1%麸皮液体培养基中,出发菌株和每个转化子均做3个平行。28℃、200 rpm振荡培养7 d以诱导甘露聚糖酶的生产。发酵7 d后收集发酵液,离心,测甘露聚糖酶活性。
甘露聚糖酶酶活的测定:用角豆胶 (MUL, Sigma)作底物进行甘露聚糖酶酶活的测定。称量0.5g角豆胶,用0.1M柠檬酸-0.2M磷酸氢二钠缓冲液(pH 5.0)定容至100 mL,配制0.5 %角豆胶底物。取酶液100 µL,加入到900 µL底物中,振荡混合均匀,50℃水浴保温15min后,向各试管中加入1.5 mL DNS试剂,再向空白中加酶液0.1 mL,混合均匀。在沸水中煮5 min,迅速冷却,测定540 nm的吸光度。1 mL液体酶,在50 ℃、pH 5.0的条件下,每分钟水解角豆胶底物,产生1 μmol还原糖(以甘露糖计)所需要的酶量定义为一个酶活力单位(U)。
由图3可知,在里氏木霉中异源表达AnMan5A时,将里氏木霉广泛使用的cbh1信号肽替换成里氏木霉的hfb2(Tr119989)信号肽、cel74A(Tr49081)信号肽以及构巢曲霉来源的果胶裂解酶A前体(An2331)信号肽后,与出发菌株SUS7-P1相比较,SUS7-S1、SUS7-S2、SUS7-S3菌株的AnMan5A活性分别是出发菌株SUS7-P1的2.76倍、3.06倍和2.81倍。
而将AnMan5A信号肽替换成来源于A.niger 134058219和A.nidulans 2572的信号肽时,与出发菌株SUS7-P1相比较,AnMan5A活性没有显著变化。
以上实施例仅用于解释本申请的技术方案,不限定本申请的保护范围。
Claims (3)
1.一种提高里氏木霉表达外源蛋白表达水平的方法,其特征在于,所述方法包括使用里氏木霉的hfb2信号肽、cel74A信号肽以及构巢曲霉来源的果胶裂解酶A前体信号肽作为在里氏木霉中表达外源蛋白的信号肽的步骤,其中,所述hfb2信号肽的氨基酸序列如SEQID NO:2所示,所述cel74A信号肽的氨基酸序列如SEQ ID NO:3所示,果胶裂解酶A前体信号肽的氨基酸序列如SEQ ID NO:4所示。
2.根据权利要求1所述的提高里氏木霉表达外源蛋白表达水平的方法,其特征在于,所述外源蛋白为黑曲霉来源的甘露聚糖酶。
3.根据权利要求2所述的提高里氏木霉表达外源蛋白表达水平的方法,其特征在于,所述外源蛋白为黑曲霉来源的甘露聚糖酶的氨基酸序列如SEQ ID NO:1所示。
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