CN113249285A - 一种高产n-乙酰神经氨酸的重组枯草芽孢杆菌及其构建方法、应用 - Google Patents
一种高产n-乙酰神经氨酸的重组枯草芽孢杆菌及其构建方法、应用 Download PDFInfo
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Abstract
本发明涉及生物工程技术领域,尤其涉及一种高产N‑乙酰神经氨酸的重组枯草芽孢杆菌及其构建方法、应用。所述高产N‑乙酰神经氨酸的重组枯草芽孢杆菌以枯草芽孢杆菌为表达宿主,将N‑乙酰神经氨酸合成酶基因neuB和N‑乙酰葡萄糖胺2‑差向异构酶基因neuC整合到枯草芽孢杆菌基因组上稳定表达,然后通过在质粒上过表达磷酸葡萄糖胺变位酶基因glmM和果糖6‑磷酸转氨酶基因glmS。本发明通过基因工程技术对B.subtilis进行改造,使其可以以甘油为底物直接合成N‑乙酰神经氨酸,生产工艺简单、环境友好、无内毒素,可用于食品领域,具有工业化生产价值。
Description
技术领域
本发明涉及生物工程技术领域,尤其涉及一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌及其构建方法、应用。
背景技术
唾液酸(sialic acid,SA)是一类含有9个碳原子并具有吡喃糖结构的酸性氨基糖,又称神经氨酸,广泛存在于植物、动物和微生物中,且种类繁多,目前已发现的有50多种,包括N-乙酰神经氨酸(Neu5Ac)、N-甘酰神经氨酸(Neu5Gc)和去氨基神经氨酸(KDN)等;而N-乙酰神经氨酸(Neu5Ac)是其中最重要的一种唾液酸,它的含量占唾液酸家族的99%以上,是其他唾液酸合成的前体物质,通常位于细胞膜表面糖链的末端,参与多种生理功能。
目前,唾液酸以及其各类衍生产品已经在食品、药品和疾病诊断等多个领域得到了广泛的应用,主要具有提高婴儿的智力和记忆力、抗老年痴呆、抗识别、抗病毒、抗炎和抗肿瘤以及提高肠道对矿物质和维生素的吸收等功能。
目前,N-乙酰神经氨酸的生产途径有从禽蛋、牛奶和燕窝等含量丰富的天然材料中提取,该方法获得的产物易引起过敏反应;或者是通过化学法合成,但该方法存在底物成本高、产物产率低、污染严重;或者是全细胞催化法生产,该法存在转化率低、底物成本高、分离步骤复杂、产物存在内毒素等问题。再或者通过构建高产N-乙酰神经氨酸的基因工程菌,通过发酵法直接生产。但目前主要采用的是大肠杆菌为宿主,大肠杆菌本身属于条件致病菌,其产品在用于食品领域,尤其是婴幼儿食品中,可能存在安全性问题。
发明内容
本发明为了克服上述现有技术中存在的问题,提供了一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌。
本发明还提供了一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌的构建方法。
本发明还提供了一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌在发酵生产N-乙酰神经氨酸中的应用。
为了实现上述目的,本发明采用以下技术方案:
一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,以枯草芽孢杆菌为表达宿主,将N-乙酰神经氨酸合成酶基因neuB和N-乙酰葡萄糖胺2-差向异构酶基因neuC整合到枯草芽孢杆菌基因组上稳定表达,然后通过在质粒上过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS。
本发明的重组枯草芽孢杆菌是通过外源表达N-乙酰神经氨酸合成酶neuB和N-乙酰葡萄糖胺2-差向异构酶neuC两个酶,结合枯草杆菌本身就有的从甘油或葡萄糖到UDP-N-乙酰氨基葡萄糖的合成途径,搭建出完整的N-乙酰神经氨酸合成途径,然后将neuBC的表达元件通过CRISPR系统整合到染色体上,再过表达的N-乙酰神经氨酸合成的两个限速酶(磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS),最终实现高产N-乙酰神经氨酸的目的。
所述枯草芽孢杆菌优选为枯草芽孢杆菌168(Bacillus subtilis 168;简称B.subtilis 168)。所述重组枯草芽孢杆菌是以B.subtilis-Pgrac-neuBC为宿主菌株构建得到的。
作为优选,以质粒pHT01为表达载体,以诱导型启动子Pgrac过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS。
作为优选,所述诱导型启动子Pgrac的核苷酸序列为SEQ ID NO.1。
作为优选,所述磷酸葡萄糖胺变位酶基因glmM的核苷酸序列为SEQ ID NO.2;所述果糖6-磷酸转氨酶基因glmS的核苷酸序列为SEQ ID NO.3。
作为优选,所述B.subtilis-Pgrac-neuBC是通过全基因合成C.jejuni来源的N-乙酰神经氨酸合成酶基因neuB和N-乙酰葡萄糖胺2-差向异构酶基因neuC,克隆到整合质粒pJOE8999上,重组于B.subtilis 168基因组上,neuBC的核苷酸序列为SEQ ID NO.4。
作为优选,所述磷酸葡萄糖胺变位酶基因glmM来源于枯草芽孢杆菌或能表达相同功能酶的微生物。
作为优选,所述果糖6-磷酸转氨酶基因glmS来源于大肠杆菌或能表达相同功能酶的微生物。
一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌的构建方法,包括以下步骤:
(1)将N-乙酰神经氨酸合成酶基因neuB、N-乙酰葡萄糖胺2-差向异构酶基因neuC重组于枯草芽孢杆菌基因组;具体位置是淀粉酶amyE基因上;
(2)在质粒上过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS,即得高产N-乙酰神经氨酸的重组枯草芽孢杆菌。
作为优选,步骤(1)的具体步骤为:
克隆N-乙酰神经氨酸合成酶基因neuB和N-乙酰葡萄糖胺2-差向异构酶基因neuBC,克隆Pgrac启动子基因序列和淀粉酶amyE两侧同源臂基因序列,4段基因通过Overlap PCR组装。
作为优选,步骤(2)的具体步骤为:
(a)以枯草芽孢杆菌基因组DNA为模板PCR扩增获得glmM基因片段;
(b)以大肠杆菌菌株基因组DNA为模板PCR扩增获得glmS基因片段;
(c)以glmM片段和glmS片段为模板PCR扩增获得glmM-glmS基因片段;
(d)通过酶切连接克隆至表达载体pHT01上。
一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌的应用,以甘油为底物,采用所述重组枯草芽孢杆菌发酵生产N-乙酰神经氨酸。
作为优选,发酵生产N-乙酰神经氨酸具体包括以下步骤:
1)活化培养菌种,发酵培养基(g/L):甘油20,胰蛋白胨3,酵母粉1,MgSO4·7H20,补料培养基(g/L):甘油800,酵母浸膏100,胰蛋白胨30;在发酵培养基中接种重组枯草芽孢杆菌;
2)将培养好的种子逐级放大,并在相应的发酵罐中进行好气培养,温度控制在37℃,pH通过氨水调控至6.8,溶氧保持在30%,同时补充合适的碳氮源;
3)加入异丙基-β-D-硫代吡喃半乳糖苷(IPTG),诱导相关蛋白的表达。
因此,本发明具有如下有益效果:本发明通过基因工程技术对B.subtilis进行改造,使其可以以甘油为底物直接合成N-乙酰神经氨酸,生产工艺简单、环境友好、无内毒素,可用于食品领域,具有工业化生产价值。
附图说明
图1是B.subtilis中甘油到N-乙酰神经氨酸的合成途径。
图2是BsBC、BsBCpM、BsBCpS和BsBCpMS的发酵数据图。
具体实施方式
下面通过具体实施例,并结合附图,对本发明的技术方案作进一步具体的说明。
在本发明中,若非特指,所有设备和原料均可从市场购得或是本行业常用的,下述实施例中的方法,如无特别说明,均为本领域常规方法。
实施例1:基因组上表达neuBC基因的重组菌株Bs-neuBC构建
一、neuBC基因整合质粒pJOE8999-gRNA-L-Pgrac-neuBC-R的构建
1)根据neuBC的基因序列(GenBank No.AF100048)全基因合成neuBC基因,两端添加BamHⅠ和XbaⅠ位点;
2)将合成的基因片段用BamHⅠ和XbaⅠ双酶切,回收备用;
3)抽提表达质粒pHT01,用BamHⅠ和XbaⅠ双酶切,回收备用;
4)连接上述酶切纯化好的载体和片段,用T4DNA连接酶连接,并转入大肠杆菌DH5α感受态细胞中,得到表达载体pHT01-neuBC;
5)将amyE淀粉酶基因序列输入网站http://chopchop.cbu.uib.no/中,计算最佳的gRNA序列,为TGAAGATCAGGCTATCACTG(SEQ ID NO.5);
6)以B.subtilis总DNA为模板,根据最佳的gRNA序列设计引物,正向引物F-BsaⅠ-gRNA:GAGACCTGAAGATCAGGCTATCAC(SEQ ID NO.6)和反向引物R-BsaⅠ-gRNA:GAGACCCAGTGATAGCCTGATC(SEQ ID NO.7),引物两端添加了BsaⅠ酶切位点,以便后续的基因操作;
7)以B.subtilis总DNA为模板,以上述引物(SEQ ID NO.6-7所示)PCR扩增得到gRNA片段;
8)将质粒pJOE8999和gRNA片段用BsaⅠ酶切,回收并用T4DNA连接酶连接,转入E.coli DH5α感受态细胞中,得到整合载体pJOE8999-gRNA;
9)根据amyE基因序列和gRNA基因序列设计上下游片段L、R的引物,L正向引物F-L-Sfi Ⅰ:GGCCAACGAGGCCGGAAGGGAATCAAGGAGA TAAAAGCAT(SEQ ID NO.8)和反向引物R-L-LacI:GTGAGTTAAGGCCTACTAGTTGTCGACTCTTCATCAT CAT TGG(SEQ ID NO.9),正向引物前添加SfiⅠ酶切位点,反向引物添加Pgrac-neuBC同源序列;R正向引物F-neuBC-R:GTTTTTAAGGATATAAAATGATGGAAACAACCAGATA TTTATG(SEQ ID NO.10)和反向引物R-SfiⅠ-R:GGCCTTATTGGCCGGCGCTGCCATTA TTAAA AATCACTTTTGC(SEQ ID NO.11),正向引物添加Pgrac-neuBC同源序列,反向引物添加SfiⅠ酶切位点;
10)以B.subtilis总DNA为模板,以上述引物(SEQ ID NO.8-11所示)PCR扩增得到L臂(SEQ ID NO.12)和R臂(SEQ ID NO.13);
11)根据pHT01-neuBC质粒基因序列和amyE淀粉酶基因序列,设计Pgrac-neuBC的引物,正向引物F-L-LacI:CCAATGATGATGAAGAGTCGACAACTAGTAGGCCTTAACTCACATTAATTGCGTTGCGC(SEQ ID NO.14)和反向引物R-R-neuBC:TGATTCA TAAATATCTGGTTGTTTCCATCATTTTATATCCTTAAAAACTTTTTG(SEQ ID NO.15),正向引物添加L臂同源片段,反向引物添加R臂同源序列,以便Overlap PCR的操作;
12)以pHT01-neuBC质粒为模板,以上述引物(SEQ ID NO.14-15所示)PCR扩增得到Pgrac-neuBC片段;
13)以L臂、R臂和Pgrac-neuBC片段为模板,以上述引物(SEQ ID NO.8、15、11所示)通过Overlap PCR扩增得到L-Pgrac-neuBC-R片段(SEQ ID NO.16);
14)将质粒pJOE8999-gRNA和L-Pgrac-neuBC-R片段用SfiⅠ酶切,回收并用T4DNA连接酶连接,转入E.coli DH5α感受态细胞中,得到整合载体pJOE8999-gRNA-L-Pgrac-neuBC-R。
二、基因组上表达neuBC基因的重组菌株筛选
1)将整合载体pJOE8999-gRNA-L-Pgrac-neuBC-R电转入B.subtilis感受态中,通过抗性筛选和和引物验证得到单交换菌株;
2)挑点至无抗LB试管中,加入木糖诱导Cas9蛋白表达,后转入50℃摇床使质粒脱落;
3)涂布无抗平板上,将平板上的菌落分别挑至无抗和Kan抗性平板上,对于无抗菌进行双交换验证,得到基因组上表达neuBC的重组菌株Bs-neuBC。
实施例2:glmS基因表达载体的构建
1)根据E.coli总DNA基因序列中的glmS基因及其上下游的序列设计引物,正向引物为F-BamHⅠ-glmS:GGATCCATGTGTGGAATTGTTGGCGCG(SEQ ID NO.17)和反向引物R-XbaⅠ-glmS:TCTAGATTACTCAACCGTAACCGATTTTGCCAGGT(SEQ ID NO.18),正向引物前添加BamHⅠ酶切位点,反向引物前添加XbaⅠ酶切位点;
2)以E.coli总DNA为模板,以上述引物(SEQ ID NO.17-18所示)通过PCR扩增获得glmS片段(SEQ ID NO.19);
3)将质粒pHT01和glmS片段用BamHⅠ和XbaⅠ双酶切,回收并用T4DNA连接酶连接,转入E.coli DH5α感受态细胞中,得到表达载体pHT01-glmS。
实施例3:glmM基因表达载体的构建
1)根据B.subtilis总DNA基因序列中的glmS基因及其上下游的序列设计引物,正向引物为F-BamHⅠ-glmM:GGATCCATGGGCAAGTATTTTGGAACAGACGGTGTA A(SEQ ID NO.20)和反向引物R-XbaⅠ-glmM:TCTAGATTACTCTAATCCCATTTCTGAC CGGA(SEQ ID NO.21),正向引物前添加BamHⅠ酶切位点,反向引物前添加XbaⅠ酶切位点;
2)以B.subtilis总DNA为模板,以上述引物(SEQ ID NO.20-21所示)通过PCR扩增获得glmM(SEQ ID NO.22)片段;
3)将质粒pHT01和glmM片段用BamHⅠ和XbaⅠ双酶切,回收并用T4DNA连接酶连接,转入E.coli DH5α感受态细胞中,得到表达载体pHT01-glmM。
实施例4:glmM-glmS基因表达载体的构建
1)根据glmM和glmS基因序列设计引物,反向引物R-glmS-glmM:ATCGCGC CAACAATTCCACACATTTACTCTAATCCCATTTCT(SEQ ID NO.23),在反向引物上添加glmS同源序列;
2)以glmM和glmS片段为模板,以上述引物(SEQ ID NO.20、23、21所示)通过Overlap PCR扩增获得glmM-glmS片段(SEQ ID NO.24);
3)将质粒pHT01和glmM-glmS片段用BamHⅠ和XbaⅠ双酶切,回收并用T4DNA连接酶连接,转入E.coli DH5α感受态细胞中,得到表达载体pHT01-glmM-glmS。
实施例5:过表达基因产N-乙酰神经氨酸的重组B.subtilis菌株构建
1)将用液体LB培养基培养含有载体pHT01-glmM、pHT01-glmS和pHT01-glmM-glmS的E.coli DH5α菌株,抽提质粒pHT01-glmM、pHT01-glmS和pHT01-glmM-glmS;
2)培养重组B.subtilis菌株Bs-neuBC,制备感受态细胞,并分别电击转化质粒pHT01-glmM、pHT01-glmS和pHT01-glmM-glmS进入,获得基因工程菌株Bs-neuBC-pHT01-glmM、Bs-neuBC-pHT01-glmS和Bs-neuBC-pHT01-glmM-glmS,分别命名为BsBCpM、BsBCpS和BsBCpMS,重组枯草芽孢杆菌菌株Bs-neuBC命名为BsBC。
实施例6:甘油为碳源发酵生产N-乙酰神经氨酸
1、种子和发酵培养基
发酵培养基(g/L):甘油20,胰蛋白胨3,酵母粉1,MgSO4·7H20;
补料培养基(g/L):甘油800,酵母浸膏100,胰蛋白胨30。
2、发酵过程:
1)挑取BsBC、BsBCpM、BsBCpS和BsBCpMS单菌落于装液量5mL LB试管中,37℃培养12小时;
2)2mL一级种子液接种于200mL种子培养基中,37℃,220rpm培养12h;
3)二级种子液接种于装液量3.8L的发酵罐中,37℃,搅拌速度300-700转/分钟,溶氧保持在30%以上,用氨水控制pH在6.8;
4)甘油耗完后,开始以1g/(L·h)的速度补加甘油,后根据溶氧变化调整补料速度;
5)发酵液菌体OD600=20左右时加入IPTG(IPTG终浓度为0.2mM),37℃培养96h;
6)经检测,96h发酵结束时,BsBC产物N-乙酰神经氨酸的浓度可达8.99g/L,BsBCpM产物N-乙酰神经氨酸的浓度可达10.35g/L,BsBCpS产物N-乙酰神经氨酸的浓度可达12.84g/L,BsBCpMS产物N-乙酰神经氨酸的浓度可达14.64g/L。
发酵结果如表1所示,分别过表达过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS能有效提高N-乙酰神经氨酸的产量,而同时过表达双基因大大提高了N-乙酰神经氨酸的产量,较原菌株相比,提高了62.8%。
表1.各个菌株发酵产N-乙酰神经氨酸的结果
以上所述仅为本发明的较佳实施例,并非对本发明作任何形式上的限制,在不超出权利要求所记载的技术方案的前提下还有其它的变体及改型。
序列表
<110> 浙江工业大学
<120> 一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌及其构建方法、应用
<160> 24
<170> SIPOSequenceListing 1.0
<210> 2
<211> 1506
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 2
tcactgcccg ctttccagtc gggaaacctg tcgtgccagc tgcattaatg aatcggccaa 60
cgcgcgggga gaggcggttt gcgtattggg cgccagggtg gtttttcttt tcaccagtga 120
gacgggcaac agctgattgc ccttcaccgc ctggccctga gagagttgca gcaagcggtc 180
cacgctggtt tgccccagca ggcgaaaatc ctgtttgatg gtggttaacg gcgggatata 240
acatgagctg tcttcggtat cgtcgtatcc cactaccgag atatccgcac caacgcgcag 300
cccggactcg gtaatggcgc gcattgcgcc cagcgccatc tgatcgttgg caaccagcat 360
cgcagtggga acgatgccct cattcagcat ttgcatggtt tgttgaaaac cggacatggc 420
actccagtcg ccttcccgtt ccgctatcgg ctgaatttga ttgcgagtga gatatttatg 480
ccagccagcc agacgcagac gcgccgagac agaacttaat gggcccgcta acagcgcgat 540
ttgctggtga cccaatgcga ccagatgctc cacgcccagt cgcgtaccgt cttcatggga 600
gaaaataata ctgttgatgg gtgtctggtc agagacatca agaaataacg ccggaacatt 660
agtgcaggca gcttccacag caatggcatc ctggtcatcc agcggatagt taatgatcag 720
cccactgacg cgttgcgcga gaagattgtg caccgccgtt ttacaggctt cgacgccgct 780
tcgttctacc atcgacacca ccacgctggc acccagttga tcggcgcgag atttaatcgc 840
cgcgacaatt tgcgacggcg cgtgcagggc cagactggag gtggcaacgc caatcagcaa 900
cgactgtttg cccgccagtt gttgtgccac gcggttggga atgtaattca gctccgccat 960
cgccgcttcc actttttccc gcgttttcgc agaaacgtgg ctggcctggt tcaccacgcg 1020
ggaaacggtc tgataagaga caccggcata ctctgcgaca tcgtataacg ttactggttt 1080
catcaaaatc gtctccctcc gtttgaatat ttgattgatc gtaaccagat gaagcactct 1140
ttccactatc cctacagtgt tatggcttga acaatcacga aacaataatt ggtacgtacg 1200
atctttcagc cgactcaaac atcaaatctt acaaatgtag tctttgaaag tattacatat 1260
gtaagattta aatgcaaccg ttttttcgga aggaaatgat gacctcgttt ccaccggaat 1320
tagcttggta ccagctattg taacataatc ggtacggggg tgaaaaagct aacggaaaag 1380
ggagcggaaa agaatgatgt aagcgtgaaa aattttttat cttatcactt gaaattggaa 1440
gggagattct ttattataag aattgtggaa ttgtgagcgg ataacaattc ccaattaaag 1500
gaggaa 1506
<210> 2
<211> 1347
<212> DNA
<213> 磷酸葡萄糖胺变位酶(Artificial Sequence)
<400> 2
atgggcaagt attttggaac agacggtgta agaggtgtcg ccaatagtga gcttacacct 60
gagctggcct ttaaagtcgg acgtttcggc ggttatgtgc tgacaaaaga caaacaacgt 120
ccaaaagtgc tgataggccg cgatacacgc atctccggcc atatgctgga gggagccctt 180
gtcgccggac ttttatccat tggcgcagaa gtcatgcgcc tgggtgtcat ttctacacca 240
ggtgtatctt atttgacaaa agcgatggat gcagaggcgg gcgtcatgat ttccgcttct 300
cataacccag tgcaggataa cggcatcaaa ttctttgggg gagatggatt taagctttct 360
gatgaacagg aggctgaaat tgagcgcctg atggacgaac ctgaggataa gctgccaaga 420
cctgtcggag cagaccttgg acttgtaaac gattattttg aaggcggaca aaaatatctg 480
caattcttaa aacagacagc tgatgaagat ttcacaggca ttcatgtggc attggactgt 540
gccaatggcg caacgtcatc cttggcgaca cacctgtttg ctgatttaga tgcagatgtt 600
tctacaatgg ggacttcccc gaacggatta aacattaatg acggcgtcgg ttcgactcat 660
cccgaagcgc tcagcgcgtt tgtcaaagag aaaaacgcgg atctcggtct tgcgttcgac 720
ggtgacggcg accgcctgat tgctgtcgat gaaaaaggaa atattgtaga cggcgaccaa 780
atcatgtaca tatgctcaaa acatctgaaa tcagagggcc gtttaaagga tgatacagtg 840
gtttcaaccg tgatgagcaa cctcggcttc tataaggcgc tcgaaaaaga aggcatcaaa 900
agcgtgcaga cagctgtcgg cgaccgctac gtagtagaag caatgaaaaa agacggctac 960
aacgtcggcg gagagcagtc aggacatctt attttccttg attacaacac gacaggggac 1020
ggattattgt ctgctattat gctgatgaac actttaaaag caacaggcaa gccgctgtca 1080
gagcttgcag ctgaaatgca gaagttcccg cagctgttag tcaatgtgag agtgactgat 1140
aaatataaag ttgaagaaaa tgaaaaagta aaagcagtta tttctgaagt tgaaaaagaa 1200
atgaacggcg acggccggat tttggtgcgc ccttcaggaa ctgaaccgct cgtccgtgtc 1260
atggctgaag cgaagacgaa agagctgtgc gatgagtatg tcaatcgcat tgttgaagtc 1320
gtccggtcag aaatgggatt agagtaa 1347
<210> 3
<211> 1830
<212> DNA
<213> 果糖6-磷酸转氨酶(Artificial Sequence)
<400> 3
atgtgtggaa ttgttggcgc gatcgcgcaa cgtgatgtag cagaaatcct tcttgaaggt 60
ttacgtcgtc tggaataccg cggatatgac tctgccggtc tggccgttgt tgatacagaa 120
ggtcatatga cccgcctgcg tcgcctcggt aaagtccaga tgctggcaca ggcagcggaa 180
gaacatcctc tgcatggcgg cactggtatt gctcacactc gctgggcgac ccacggtgaa 240
ccttcagaag tgaatgcgca tccgcatgtt tctgaacaca ttgtggtggt gcataacggc 300
atcatcgaaa accatgaacc gctgcgtgaa gagctaaaag cgcgtggcta taccttcgtt 360
tctgaaaccg acaccgaagt gattgcccat ctggtgaact gggagctgaa acaaggcggg 420
actctgcgtg aggccgttct gcgtgctatc ccgcagctgc gtggtgcgta cggtacagtg 480
atcatggact cccgtcaccc ggataccctg ctggcggcac gttctggtag tccgctggtg 540
attggcctgg ggatgggcga aaactttatc gcttctgacc agctggcgct gttgccggtg 600
acccgtcgct ttatcttcct tgaagagggc gatattgcgg aaatcactcg ccgttcggta 660
aacatcttcg ataaaactgg cgcggaagta aaacgtcagg atatcgaatc caatctgcaa 720
tatgacgcgg gcgataaagg catttactgt cactacatgc agaaagagat ctacgaacag 780
ccgaacgcga tcaaaaacac ccttaccgga cgcatcagcc acggtcaggt tgatttaagc 840
gagctgggac cgaacgccga cgaactgctg tcgaaggttg agcatattca gatcctcgcc 900
tgtggtactt cttataactc cggtatggtt tcccgctact ggtttgaatc gctagcaggt 960
attccgtgcg acgtcgaaat cgcctctgaa ttccgctatc gcaaatctgc cgtgcgtcgt 1020
aacagcctga tgatcacctt gtcacagtct ggcgaaaccg cggataccct ggctggcctg 1080
cgtctgtcga aagagctggg ttaccttggt tcactggcaa tctgtaacgt tccgggttct 1140
tctctggtgc gcgaatccga tctggcgcta atgaccaacg cgggtacaga aatcggcgtg 1200
gcatccacta aagcattcac cactcagtta actgtgctgt tgatgctggt ggcgaagctg 1260
tctcgcctga aaggtctgga tgcctccatt gaacatgaca tcgtgcatgg tctgcaggcg 1320
ctgccgagcc gtattgagca gatgctgtct caggacaaac gcattgaagc gctggcagaa 1380
gatttctctg acaaacatca cgcgctgttc ctgagccgtg gcgatcagta cccaatcgcg 1440
ctggaaggcg cattgaagtt gaaagagatc tcttacattc acgctgaagc ctacgctgct 1500
ggcgaactga aacacggtcc gctggcgcta attgatgccg atatgccggt tattgttgtt 1560
gcaccgaaca acgaattgct ggaaaaactg aaatccaaca ttgaagaagt tcgcgcgcgt 1620
ggcggtcagt tgtatgtctt cgccgatcag gatgcgggtt ttgtaagtag cgataacatg 1680
cacatcatcg agatgccgca tgtggaagag gtgattgcac cgatcttcta caccgttccg 1740
ctgcagctgc tggcttacca tgtcgcgctg atcaaaggca ccgacgttga ccagccgcgt 1800
aacctggcaa aatcggttac ggttgagtaa 1830
<210> 4
<211> 1554
<212> DNA
<213> 枯草芽孢杆菌(Artificial Sequence)
<400> 4
attttcttgt atggtaggct taagcgacca cacaacagat aatcttgcgt gtttaggtgc 60
agttgtactt ggagcttgtg tgcttgaaag acattttact gatagtatgc atagaagtgg 120
ccctgatata gtttgttcta tggatacaaa ggctttaaaa gagctaatta tacaaagtga 180
gcaaatggct ataataagag gaaataatga aagtaaaaaa gcggctaaac aagaacaagt 240
tacaattgat tttgcctttg caagtgtagt tagcattaaa gatattaaaa aaggcgaagt 300
tttatctatg gataatattt gggttaaaag acctggactt ggtggaatta gtgcggctga 360
atttgaaaat attttaggca aaaaagcatt aagagatata gaaaatgatg ctcagttaag 420
ctatgaggat tttgcgtgaa aaaaatcctt tttataacag gctctagggc tgattattct 480
aagattaaat ctttaatgta cagggtgcaa aactcaagcg aatttgaact ttacatcttt 540
gcaacaggaa tgcacttaag taaaaatttt ggctatacag ttaaagaact ttataaaaat 600
ggctttaaaa atatttatga atttataaat tatgataaat attatcaaac tgataaggct 660
ttagctacta caattgatgg attttcaagg tatgcaaatg agctaaaacc tgatttaatc 720
gtagtacatg gagatagaat tgagccttta gcagcagcta ttgttggagc attaaataat 780
atcttagtag cgcatattga aggcggagag atttcaggaa ctattgacga tagcttacgc 840
cacgctatat caaaactagc tcatattcat ttagtaaatg atgagtttgc aaaaaggcgt 900
ttaatgcagc ttggagaaga tgaaaaatct atttttatca taggttcgcc tgatttagaa 960
cttttaaacg ataataaaat ttcacttagc gaagcaaaaa aatattatga tataaattat 1020
gaaaactacg ctttgcttat gtttcatcct gttacaactg aaattactag cattaaaaat 1080
caagcagaca atttagtaaa agcactgata caaagtaata aaaattatat tgttatttat 1140
ccaaataatg atttaggttt tgaattaatc ttgcaaagct atgaagagtt taaaaataac 1200
cctagattta agctttttcc atcgcttaga tttgagtatt ttataacttt gttaaaaaat 1260
gctgatttta taataggtaa ttcaagttgt attttaaaag aggccttata cttaaaaaca 1320
gcagggattt tagttggctc aagacaaaat ggaagacttg gcaatgaaaa tacactaaaa 1380
gttaatgcaa atagtgatga aatactaaaa gctattaaca ctattcataa aaaacaagat 1440
ttatttagcg ctaagttaga gattttagat agctcaaaat tattttttga atatttacaa 1500
agcggagatt tttttaaact cagcacacaa aaagttttta aggatataaa atga 1554
<210> 6
<211> 20
<212> DNA
<213> amyE淀粉酶(Artificial Sequence)
<400> 6
tgaagatcag gctatcactg 20
<210> 6
<211> 24
<212> DNA
<213> 正向引物(Artificial Sequence)
<400> 6
gagacctgaa gatcaggcta tcac 24
<210> 7
<211> 24
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 7
gagacctgaa gatcaggcta tcac 24
<210> 8
<211> 40
<212> DNA
<213> L正向引物(Artificial Sequence)
<400> 8
ggccaacgag gccggaaggg aatcaaggag ataaaagcat 40
<210> 9
<211> 43
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 9
gtgagttaag gcctactagt tgtcgactct tcatcatcat tgg 43
<210> 10
<211> 43
<212> DNA
<213> R正向引物(Artificial Sequence)
<400> 10
gtttttaagg atataaaatg atggaaacaa ccagatattt atg 43
<210> 11
<211> 43
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 11
ggccttattg gccggcgctg ccattattaa aaatcacttt tgc 43
<210> 12
<211> 700
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 12
ggaagggaat caaggagata aaagcatgtc gaactggtac tggctgtatc agccgacatc 60
gtatcaaatt ggcaaccgtt acttaggtac tgaacaagaa tttaaagaaa tgtgtgcagc 120
cgctgaagaa tatggcataa aggtcattgt tgacgcggtc atcaatcata ccaccagtga 180
ttatgccgcg atttccaatg aggttaagag tattccaaac tggacacatg gaaacacaca 240
aattaaaaac tggtctgatc gatgggatgt cacgcagaat tcattgctcg ggctgtatga 300
ctggaataca caaaatacac aagtacagtc ctatctgaaa cggttcttag acagggcatt 360
gaatgacggg gcagacggtt ttcgatttga tgccgccaaa catatagagc ttccagatga 420
tggcagttac ggcagtcaat tttggccgaa tatcacaaat acatctgcag agttccaata 480
cggagaaatc ctgcaggata gtgcctccag agatgctgca tatgcgaatt atatggatgt 540
gacagcgtct aactatgggc attccataag gtccgcttta aagaatcgta atctgggcgt 600
gtcgaatatc tcccactatg catctgatgt gtctgcggac aagctagtga catgggtaga 660
gtcgcatgat acgtatgcca atgatgatga agagtcgaca 700
<210> 13
<211> 700
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 13
tggaaacaac cagatattta tgaatcagcg cggctcacat ggcgttgtgc tggcaaatgc 60
aggttcatcc tctgtctcta tcaatacggc aacaaaattg cctgatggca ggtatgacaa 120
taaagctgga gcgggttcat ttcaagtgaa cgatggtaaa ctgacaggca cgatcaatgc 180
caggtctgta gctgtgcttt atcctgatga tattgcaaaa gcgcctcatg ttttccttga 240
gaattacaaa acaggtgtaa cacattcttt caatgatcaa ctgacgatta ccttgcgtgc 300
agatgcgaat acaacaaaag ccgtttatca aatcaataat ggaccagaga cggcgtttaa 360
ggatggagat caattcacaa tcggaaaagg agatccattt ggcaaaacat acaccatcat 420
gttaaaagga acgaacagtg atggtgtaac gaggaccgag aaatacagtt ttgttaaaag 480
agatccagcg tcggccaaaa ccatcggcta tcaaaatccg aatcattgga gccaggtaaa 540
tgcttatatc tataaacatg atgggagccg agtaattgaa ttgaccggat cttggcctgg 600
aaaaccaatg actaaaaatg cagacggaat ttacacgctg acgctgcctg cggacacgga 660
tacaaccaac gcaaaagtga tttttaataa tggcagcgcc 700
<210> 14
<211> 59
<212> DNA
<213> 正向引物(Artificial Sequence)
<400> 14
ccaatgatga tgaagagtcg acaactagta ggccttaact cacattaatt gcgttgcgc 59
<210> 15
<211> 54
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 15
tgattcataa atatctggtt gtttccatca ttttatatcc ttaaaaactt tttg 54
<210> 16
<211> 5117
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 16
ggaagggaat caaggagata aaagcatgtc gaactggtac tggctgtatc agccgacatc 60
gtatcaaatt ggcaaccgtt acttaggtac tgaacaagaa tttaaagaaa tgtgtgcagc 120
cgctgaagaa tatggcataa aggtcattgt tgacgcggtc atcaatcata ccaccagtga 180
ttatgccgcg atttccaatg aggttaagag tattccaaac tggacacatg gaaacacaca 240
aattaaaaac tggtctgatc gatgggatgt cacgcagaat tcattgctcg ggctgtatga 300
ctggaataca caaaatacac aagtacagtc ctatctgaaa cggttcttag acagggcatt 360
gaatgacggg gcagacggtt ttcgatttga tgccgccaaa catatagagc ttccagatga 420
tggcagttac ggcagtcaat tttggccgaa tatcacaaat acatctgcag agttccaata 480
cggagaaatc ctgcaggata gtgcctccag agatgctgca tatgcgaatt atatggatgt 540
gacagcgtct aactatgggc attccataag gtccgcttta aagaatcgta atctgggcgt 600
gtcgaatatc tcccactatg catctgatgt gtctgcggac aagctagtga catgggtaga 660
gtcgcatgat acgtatgcca atgatgatga agagtcgaca actagtaggc cttaactcac 720
attaattgcg ttgcgctcac tgcccgcttt ccagtcggga aacctgtcgt gccagctgca 780
ttaatgaatc ggccaacgcg cggggagagg cggtttgcgt attgggcgcc agggtggttt 840
ttcttttcac cagtgagacg ggcaacagct gattgccctt caccgcctgg ccctgagaga 900
gttgcagcaa gcggtccacg ctggtttgcc ccagcaggcg aaaatcctgt ttgatggtgg 960
ttaacggcgg gatataacat gagctgtctt cggtatcgtc gtatcccact accgagatat 1020
ccgcaccaac gcgcagcccg gactcggtaa tggcgcgcat tgcgcccagc gccatctgat 1080
cgttggcaac cagcatcgca gtgggaacga tgccctcatt cagcatttgc atggtttgtt 1140
gaaaaccgga catggcactc cagtcgcctt cccgttccgc tatcggctga atttgattgc 1200
gagtgagata tttatgccag ccagccagac gcagacgcgc cgagacagaa cttaatgggc 1260
ccgctaacag cgcgatttgc tggtgaccca atgcgaccag atgctccacg cccagtcgcg 1320
taccgtcttc atgggagaaa ataatactgt tgatgggtgt ctggtcagag acatcaagaa 1380
ataacgccgg aacattagtg caggcagctt ccacagcaat ggcatcctgg tcatccagcg 1440
gatagttaat gatcagccca ctgacgcgtt gcgcgagaag attgtgcacc gccgttttac 1500
aggcttcgac gccgcttcgt tctaccatcg acaccaccac gctggcaccc agttgatcgg 1560
cgcgagattt aatcgccgcg acaatttgcg acggcgcgtg cagggccaga ctggaggtgg 1620
caacgccaat cagcaacgac tgtttgcccg ccagttgttg tgccacgcgg ttgggaatgt 1680
aattcagctc cgccatcgcc gcttccactt tttcccgcgt tttcgcagaa acgtggctgg 1740
cctggttcac cacgcgggaa acggtctgat aagagacacc ggcatactct gcgacatcgt 1800
ataacgttac tggtttcatc aaaatcgtct ccctccgttt gaatatttga ttgatcgtaa 1860
ccagatgaag cactctttcc actatcccta cagtgttatg gcttgaacaa tcacgaaaca 1920
ataattggta cgtacgatct ttcagccgac tcaaacatca aatcttacaa atgtagtctt 1980
tgaaagtatt acatatgtaa gatttaaatg caaccgtttt ttcggaagga aatgatgacc 2040
tcgtttccac cggaattagc ttggtaccag ctattgtaac ataatcggta cgggggtgaa 2100
aaagctaacg gaaaagggag cggaaaagaa tgatgtaagc gtgaaaaatt ttttatctta 2160
tcacttgaaa ttggaaggga gattctttat tataagaatt gtggaattgt gagcggataa 2220
caattcccaa ttaaaggagg aaggatccat gaaagaaata aaaatacaaa atataatcat 2280
aagtgaagaa aaagcaccct tagtcgtacc tgaaataggc attaatcata atggcagttt 2340
agaactagct aaaattatgg tagatgcagc ctttagcgca ggtgctaaga ttataaagca 2400
tcaaactcat attgttgaag atgagatgag taaggccgct aaaaaagtaa ttcctggtaa 2460
tgcaaaaata agcatttatg agattatgca aaaatgtgct ttggattata aagatgagct 2520
agcacttaaa gaatacacag aaaaattagg tcttgtttat cttagcacac ctttttctcg 2580
tgcaggtgcg aaccgcttag aagatatggg agttagtgct tttaagattg gttcaggtga 2640
gtgtaataat tatccgctta ttaaacacat agcagccttt aaaaagccta tgatagttag 2700
cacaggaatg aatagtattg aaagtataaa accaactgta aaaatcttat tagacaatga 2760
aattcctttt gttttaatgc acacgaccaa tctttaccca accccgcata atcttgtaag 2820
attaaacgct atgcttgagt taaaaaaaga attttcttgt atggtaggct taagcgacca 2880
cacaacagat aatcttgcgt gtttaggtgc agttgtactt ggagcttgtg tgcttgaaag 2940
acattttact gatagtatgc atagaagtgg ccctgatata gtttgttcta tggatacaaa 3000
ggctttaaaa gagctaatta tacaaagtga gcaaatggct ataataagag gaaataatga 3060
aagtaaaaaa gcggctaaac aagaacaagt tacaattgat tttgcctttg caagtgtagt 3120
tagcattaaa gatattaaaa aaggcgaagt tttatctatg gataatattt gggttaaaag 3180
acctggactt ggtggaatta gtgcggctga atttgaaaat attttaggca aaaaagcatt 3240
aagagatata gaaaatgatg ctcagttaag ctatgaggat tttgcgtgaa aaaaatcctt 3300
tttataacag gctctagggc tgattattct aagattaaat ctttaatgta cagggtgcaa 3360
aactcaagcg aatttgaact ttacatcttt gcaacaggaa tgcacttaag taaaaatttt 3420
ggctatacag ttaaagaact ttataaaaat ggctttaaaa atatttatga atttataaat 3480
tatgataaat attatcaaac tgataaggct ttagctacta caattgatgg attttcaagg 3540
tatgcaaatg agctaaaacc tgatttaatc gtagtacatg gagatagaat tgagccttta 3600
gcagcagcta ttgttggagc attaaataat atcttagtag cgcatattga aggcggagag 3660
atttcaggaa ctattgacga tagcttacgc cacgctatat caaaactagc tcatattcat 3720
ttagtaaatg atgagtttgc aaaaaggcgt ttaatgcagc ttggagaaga tgaaaaatct 3780
atttttatca taggttcgcc tgatttagaa cttttaaacg ataataaaat ttcacttagc 3840
gaagcaaaaa aatattatga tataaattat gaaaactacg ctttgcttat gtttcatcct 3900
gttacaactg aaattactag cattaaaaat caagcagaca atttagtaaa agcactgata 3960
caaagtaata aaaattatat tgttatttat ccaaataatg atttaggttt tgaattaatc 4020
ttgcaaagct atgaagagtt taaaaataac cctagattta agctttttcc atcgcttaga 4080
tttgagtatt ttataacttt gttaaaaaat gctgatttta taataggtaa ttcaagttgt 4140
attttaaaag aggccttata cttaaaaaca gcagggattt tagttggctc aagacaaaat 4200
ggaagacttg gcaatgaaaa tacactaaaa gttaatgcaa atagtgatga aatactaaaa 4260
gctattaaca ctattcataa aaaacaagat ttatttagcg ctaagttaga gattttagat 4320
agctcaaaat tattttttga atatttacaa agcggagatt tttttaaact cagcacacaa 4380
aaagttttta aggatataaa atgatggaaa caaccagata tttatgaatc agcgcggctc 4440
acatggcgtt gtgctggcaa atgcaggttc atcctctgtc tctatcaata cggcaacaaa 4500
attgcctgat ggcaggtatg acaataaagc tggagcgggt tcatttcaag tgaacgatgg 4560
taaactgaca ggcacgatca atgccaggtc tgtagctgtg ctttatcctg atgatattgc 4620
aaaagcgcct catgttttcc ttgagaatta caaaacaggt gtaacacatt ctttcaatga 4680
tcaactgacg attaccttgc gtgcagatgc gaatacaaca aaagccgttt atcaaatcaa 4740
taatggacca gagacggcgt ttaaggatgg agatcaattc acaatcggaa aaggagatcc 4800
atttggcaaa acatacacca tcatgttaaa aggaacgaac agtgatggtg taacgaggac 4860
cgagaaatac agttttgtta aaagagatcc agcgtcggcc aaaaccatcg gctatcaaaa 4920
tccgaatcat tggagccagg taaatgctta tatctataaa catgatggga gccgagtaat 4980
tgaattgacc ggatcttggc ctggaaaacc aatgactaaa aatgcagacg gaatttacac 5040
gctgacgctg cctgcggaca cggatacaac caacgcaaaa gtgattttta ataatggcag 5100
cgccggccaa taaggcc 5117
<210> 17
<211> 27
<212> DNA
<213> 正向引物(Artificial Sequence)
<400> 17
ggatccatgt gtggaattgt tggcgcg 27
<210> 18
<211> 35
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 18
tctagattac tcaaccgtaa ccgattttgc caggt 35
<210> 19
<211> 1842
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 19
ggatccatgt gtggaattgt tggcgcgatc gcgcaacgtg atgtagcaga aatccttctt 60
gaaggtttac gtcgtctgga ataccgcgga tatgactctg ccggtctggc cgttgttgat 120
acagaaggtc atatgacccg cctgcgtcgc ctcggtaaag tccagatgct ggcacaggca 180
gcggaagaac atcctctgca tggcggcact ggtattgctc acactcgctg ggcgacccac 240
ggtgaacctt cagaagtgaa tgcgcatccg catgtttctg aacacattgt ggtggtgcat 300
aacggcatca tcgaaaacca tgaaccgctg cgtgaagagc taaaagcgcg tggctatacc 360
ttcgtttctg aaaccgacac cgaagtgatt gcccatctgg tgaactggga gctgaaacaa 420
ggcgggactc tgcgtgaggc cgttctgcgt gctatcccgc agctgcgtgg tgcgtacggt 480
acagtgatca tggactcccg tcacccggat accctgctgg cggcacgttc tggtagtccg 540
ctggtgattg gcctggggat gggcgaaaac tttatcgctt ctgaccagct ggcgctgttg 600
ccggtgaccc gtcgctttat cttccttgaa gagggcgata ttgcggaaat cactcgccgt 660
tcggtaaaca tcttcgataa aactggcgcg gaagtaaaac gtcaggatat cgaatccaat 720
ctgcaatatg acgcgggcga taaaggcatt tactgtcact acatgcagaa agagatctac 780
gaacagccga acgcgatcaa aaacaccctt accggacgca tcagccacgg tcaggttgat 840
ttaagcgagc tgggaccgaa cgccgacgaa ctgctgtcga aggttgagca tattcagatc 900
ctcgcctgtg gtacttctta taactccggt atggtttccc gctactggtt tgaatcgcta 960
gcaggtattc cgtgcgacgt cgaaatcgcc tctgaattcc gctatcgcaa atctgccgtg 1020
cgtcgtaaca gcctgatgat caccttgtca cagtctggcg aaaccgcgga taccctggct 1080
ggcctgcgtc tgtcgaaaga gctgggttac cttggttcac tggcaatctg taacgttccg 1140
ggttcttctc tggtgcgcga atccgatctg gcgctaatga ccaacgcggg tacagaaatc 1200
ggcgtggcat ccactaaagc attcaccact cagttaactg tgctgttgat gctggtggcg 1260
aagctgtctc gcctgaaagg tctggatgcc tccattgaac atgacatcgt gcatggtctg 1320
caggcgctgc cgagccgtat tgagcagatg ctgtctcagg acaaacgcat tgaagcgctg 1380
gcagaagatt tctctgacaa acatcacgcg ctgttcctga gccgtggcga tcagtaccca 1440
atcgcgctgg aaggcgcatt gaagttgaaa gagatctctt acattcacgc tgaagcctac 1500
gctgctggcg aactgaaaca cggtccgctg gcgctaattg atgccgatat gccggttatt 1560
gttgttgcac cgaacaacga attgctggaa aaactgaaat ccaacattga agaagttcgc 1620
gcgcgtggcg gtcagttgta tgtcttcgcc gatcaggatg cgggttttgt aagtagcgat 1680
aacatgcaca tcatcgagat gccgcatgtg gaagaggtga ttgcaccgat cttctacacc 1740
gttccgctgc agctgctggc ttaccatgtc gcgctgatca aaggcaccga cgttgaccag 1800
ccgcgtaacc tggcaaaatc ggttacggtt gagtaatcta ga 1842
<210> 20
<211> 37
<212> DNA
<213> 正向引物(Artificial Sequence)
<400> 20
ggatccatgg gcaagtattt tggaacagac ggtgtaa 37
<210> 21
<211> 32
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 21
tctagattac tctaatccca tttctgaccg ga 32
<210> 22
<211> 1358
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 22
ggatccatgg gcaagtattt tggaacagac ggtgtaagag gtgtcgccaa tagtgagctt 60
acacctgagc tggcctttaa agtcggacgt ttcggcggtt atgtgctgac aaaagacaaa 120
caacgtccaa aagtgctgat aggccgcgat acacgcatct ccggccatat gctggaggga 180
gcccttgtcg ccggactttt atccattggc gcagaagtca tgcgcctggg tgtcatttct 240
acaccaggtg tatcttattt gacaaaagcg atggatgcag aggcgggcgt catgatttcc 300
gcttctcata acccagtgca ggataacggc atcaaattct ttgggggaga tggatttaag 360
ctttctgatg aacaggaggc tgaaattgag cgcctgatgg acgaacctga ggataagctg 420
ccaagacctg tcggagcaga ccttggactt gtaaacgatt attttgaagg cggacaaaaa 480
tatctgcaat tcttaaaaca gacagctgat gaagatttca caggcattca tgtggcattg 540
gactgtgcca atggcgcaac gtcatccttg gcgacacacc tgtttgctga tttagatgca 600
gatgtttcta caatggggac ttccccgaac ggattaaaca ttaatgacgg cgtcggttcg 660
actcatcccg aagcgctcag cgcgtttgtc aaagagaaaa acgcggatct cggtcttgcg 720
ttcgacggtg acggcgaccg cctgattgct gtcgatgaaa aaggaaatat tgtagacggc 780
gaccaaatca tgtacatatg ctcaaaacat ctgaaatcag agggccgttt aaaggatgat 840
acagtggttt caaccgtgat gagcaacctc ggcttctata aggcgctcga aaaagaaggc 900
atcaaaagcg tgcagacagc tgtcggcgac cgctacgtag tagaagcaat gaaaaaagac 960
ggctacaacg tcggcggaga gcagtcagga catcttattt tccttgatta caacacgaca 1020
ggggacggat tattgtctgc tattatgctg atgaacactt taaaagcaac aggcaagccg 1080
ctgtcagagc ttgcagctga aatgcagaag ttcccgcagc tgttagtcaa tgtgagagtg 1140
actgataaat ataaagttga agaaaatgaa aaagtaaaag cagttatttc tgaagttgaa 1200
aaagaaatga acggcgacgg ccggattttg gtgcgccctt caggaactga accgctcgtc 1260
cgtgtcatgg ctgaagcgaa gacgaaagag ctgtgcgatg agtatgtcaa tcgcattgtt 1320
gaagtcgtcc ggtcagaaat gggattagag tatctaga 1358
<210> 23
<211> 42
<212> DNA
<213> 反向引物(Artificial Sequence)
<400> 23
atcgcgccaa caattccaca catttactct aatcccattt ct 42
<210> 24
<211> 3188
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 24
ggatccatgg gcaagtattt tggaacagac ggtgtaagag gtgtcgccaa tagtgagctt 60
acacctgagc tggcctttaa agtcggacgt ttcggcggtt atgtgctgac aaaagacaaa 120
caacgtccaa aagtgctgat aggccgcgat acacgcatct ccggccatat gctggaggga 180
gcccttgtcg ccggactttt atccattggc gcagaagtca tgcgcctggg tgtcatttct 240
acaccaggtg tatcttattt gacaaaagcg atggatgcag aggcgggcgt catgatttcc 300
gcttctcata acccagtgca ggataacggc atcaaattct ttgggggaga tggatttaag 360
ctttctgatg aacaggaggc tgaaattgag cgcctgatgg acgaacctga ggataagctg 420
ccaagacctg tcggagcaga ccttggactt gtaaacgatt attttgaagg cggacaaaaa 480
tatctgcaat tcttaaaaca gacagctgat gaagatttca caggcattca tgtggcattg 540
gactgtgcca atggcgcaac gtcatccttg gcgacacacc tgtttgctga tttagatgca 600
gatgtttcta caatggggac ttccccgaac ggattaaaca ttaatgacgg cgtcggttcg 660
actcatcccg aagcgctcag cgcgtttgtc aaagagaaaa acgcggatct cggtcttgcg 720
ttcgacggtg acggcgaccg cctgattgct gtcgatgaaa aaggaaatat tgtagacggc 780
gaccaaatca tgtacatatg ctcaaaacat ctgaaatcag agggccgttt aaaggatgat 840
acagtggttt caaccgtgat gagcaacctc ggcttctata aggcgctcga aaaagaaggc 900
atcaaaagcg tgcagacagc tgtcggcgac cgctacgtag tagaagcaat gaaaaaagac 960
ggctacaacg tcggcggaga gcagtcagga catcttattt tccttgatta caacacgaca 1020
ggggacggat tattgtctgc tattatgctg atgaacactt taaaagcaac aggcaagccg 1080
ctgtcagagc ttgcagctga aatgcagaag ttcccgcagc tgttagtcaa tgtgagagtg 1140
actgataaat ataaagttga agaaaatgaa aaagtaaaag cagttatttc tgaagttgaa 1200
aaagaaatga acggcgacgg ccggattttg gtgcgccctt caggaactga accgctcgtc 1260
cgtgtcatgg ctgaagcgaa gacgaaagag ctgtgcgatg agtatgtcaa tcgcattgtt 1320
gaagtcgtcc ggtcagaaat gggattagag taatgtgtgg aattgttggc gcgatcgcgc 1380
aacgtgatgt agcagaaatc cttcttgaag gtttacgtcg tctggaatac cgcggatatg 1440
actctgccgg tctggccgtt gttgatacag aaggtcatat gacccgcctg cgtcgcctcg 1500
gtaaagtcca gatgctggca caggcagcgg aagaacatcc tctgcatggc ggcactggta 1560
ttgctcacac tcgctgggcg acccacggtg aaccttcaga agtgaatgcg catccgcatg 1620
tttctgaaca cattgtggtg gtgcataacg gcatcatcga aaaccatgaa ccgctgcgtg 1680
aagagctaaa agcgcgtggc tataccttcg tttctgaaac cgacaccgaa gtgattgccc 1740
atctggtgaa ctgggagctg aaacaaggcg ggactctgcg tgaggccgtt ctgcgtgcta 1800
tcccgcagct gcgtggtgcg tacggtacag tgatcatgga ctcccgtcac ccggataccc 1860
tgctggcggc acgttctggt agtccgctgg tgattggcct ggggatgggc gaaaacttta 1920
tcgcttctga ccagctggcg ctgttgccgg tgacccgtcg ctttatcttc cttgaagagg 1980
gcgatattgc ggaaatcact cgccgttcgg taaacatctt cgataaaact ggcgcggaag 2040
taaaacgtca ggatatcgaa tccaatctgc aatatgacgc gggcgataaa ggcatttact 2100
gtcactacat gcagaaagag atctacgaac agccgaacgc gatcaaaaac acccttaccg 2160
gacgcatcag ccacggtcag gttgatttaa gcgagctggg accgaacgcc gacgaactgc 2220
tgtcgaaggt tgagcatatt cagatcctcg cctgtggtac ttcttataac tccggtatgg 2280
tttcccgcta ctggtttgaa tcgctagcag gtattccgtg cgacgtcgaa atcgcctctg 2340
aattccgcta tcgcaaatct gccgtgcgtc gtaacagcct gatgatcacc ttgtcacagt 2400
ctggcgaaac cgcggatacc ctggctggcc tgcgtctgtc gaaagagctg ggttaccttg 2460
gttcactggc aatctgtaac gttccgggtt cttctctggt gcgcgaatcc gatctggcgc 2520
taatgaccaa cgcgggtaca gaaatcggcg tggcatccac taaagcattc accactcagt 2580
taactgtgct gttgatgctg gtggcgaagc tgtctcgcct gaaaggtctg gatgcctcca 2640
ttgaacatga catcgtgcat ggtctgcagg cgctgccgag ccgtattgag cagatgctgt 2700
ctcaggacaa acgcattgaa gcgctggcag aagatttctc tgacaaacat cacgcgctgt 2760
tcctgagccg tggcgatcag tacccaatcg cgctggaagg cgcattgaag ttgaaagaga 2820
tctcttacat tcacgctgaa gcctacgctg ctggcgaact gaaacacggt ccgctggcgc 2880
taattgatgc cgatatgccg gttattgttg ttgcaccgaa caacgaattg ctggaaaaac 2940
tgaaatccaa cattgaagaa gttcgcgcgc gtggcggtca gttgtatgtc ttcgccgatc 3000
aggatgcggg ttttgtaagt agcgataaca tgcacatcat cgagatgccg catgtggaag 3060
aggtgattgc accgatcttc tacaccgttc cgctgcagct gctggcttac catgtcgcgc 3120
tgatcaaagg caccgacgtt gaccagccgc gtaacctggc aaaatcggtt acggttgagt 3180
aatctaga 3188
Claims (10)
1.一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,以枯草芽孢杆菌为表达宿主,将N-乙酰神经氨酸合成酶基因neuB和N-乙酰葡萄糖胺2-差向异构酶基因neuC整合到枯草芽孢杆菌基因组上稳定表达,然后通过在质粒上过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS。
2.根据权利要求1所述的一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,以质粒pHT01为表达载体,以诱导型启动子Pgrac过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS。
3.根据权利要求2所述的一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,所述诱导型启动子Pgrac的核苷酸序列为SEQ ID NO.1。
4.根据权利要求1所述的一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,所述磷酸葡萄糖胺变位酶基因glmM的核苷酸序列为SEQ ID NO.2;所述果糖6-磷酸转氨酶基因glmS的核苷酸序列为SEQ ID NO.3。
5.根据权利要求1所述的一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,所述磷酸葡萄糖胺变位酶基因glmM来源于枯草芽孢杆菌或能表达相同功能酶的微生物。
6.根据权利要求1所述的一种高产N-乙酰神经氨酸的重组枯草芽孢杆菌,其特征在于,所述果糖6-磷酸转氨酶基因glmS来源于大肠杆菌或能表达相同功能酶的微生物。
7.一种如权利要求1-6任一所述的高产N-乙酰神经氨酸的重组枯草芽孢杆菌的构建方法,其特征在于,包括以下步骤:
(1)将N-乙酰神经氨酸合成酶基因neuB、N-乙酰葡萄糖胺2-差向异构酶基因neuC重组于枯草芽孢杆菌基因组;具体位置是淀粉酶amyE基因上;
(2)在质粒上过表达磷酸葡萄糖胺变位酶基因glmM和果糖6-磷酸转氨酶基因glmS,即得高产N-乙酰神经氨酸的重组枯草芽孢杆菌。
8.根据权利要求7所述的构建方法,其特征在于,步骤(1)的具体步骤为:
克隆N-乙酰神经氨酸合成酶基因neuB和N-乙酰葡萄糖胺2-差向异构酶基因neuC,克隆Pgrac启动子基因序列和淀粉酶amyE两侧同源臂基因序列,4段基因通过Overlap PCR组装。
9.根据权利要求7所述的构建方法,其特征在于,步骤(2)的具体步骤为:
(a)以枯草芽孢杆菌基因组DNA为模板PCR扩增获得glmM基因片段;
(b)以大肠杆菌菌株基因组DNA为模板PCR扩增获得glmS基因片段;
(c)以glmM片段和glmS片段为模板PCR扩增获得glmM-glmS基因片段;
(d)通过酶切连接克隆至表达载体pHT01上。
10.一种如权利要求1-6任一所述的高产N-乙酰神经氨酸的重组枯草芽孢杆菌的应用,其特征在于,以甘油为底物,采用所述重组枯草芽孢杆菌发酵生产N-乙酰神经氨酸。
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