CN111172213A - 一种用双酶串联制备l-2-氨基丁酸的方法 - Google Patents

一种用双酶串联制备l-2-氨基丁酸的方法 Download PDF

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CN111172213A
CN111172213A CN202010058267.1A CN202010058267A CN111172213A CN 111172213 A CN111172213 A CN 111172213A CN 202010058267 A CN202010058267 A CN 202010058267A CN 111172213 A CN111172213 A CN 111172213A
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周哲敏
刘中美
刘宇锋
周丽
崔文璟
郭军玲
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Abstract

本发明公开了一种用双酶串联制备L‑2‑氨基丁酸的方法,属于生物工程领域。本发明通过分别培养表达L‑谷氨酸变位酶和L‑天冬氨酸‑β‑脱羧酶的重组大肠杆菌,获得L‑谷氨酸变位酶和L‑天冬氨酸‑β‑脱羧酶。将两种酶以一定质量比添加到反应体系中,以L‑谷氨酸为底物,进行酶反应制备L‑2‑氨基丁酸,当L‑天冬氨酸‑β‑脱羧酶的用量为2mg/mL,反应24h,转化生成8.5mmol/L L‑2氨基丁酸,摩尔转化率为85.00%。此法与化学生产法相比,生产工艺安全,无环境污染。与以苏氨酸为底物的多酶合成体系相比,底物价格更便宜,工艺更简单。

Description

一种用双酶串联制备L-2-氨基丁酸的方法
技术领域
本发明涉及一种用双酶串联制备L-2-氨基丁酸的方法,属于生物工程技术领域。
背景技术
L-2-氨基丁酸(L-ABA)是一种非蛋白质氨基酸,是重要的药物中间体,被广泛用于医药、农药及食品领域,例如,可用来合成抗癫痫药物左乙拉西坦和抗结核药物乙胺丁醇、布瓦西坦等。目前L-2-氨基丁酸的合成方法主要包括化学合成法、生物合成法两种。L-2-氨基丁酸的化学不对称合成需用到剧毒化学试剂氰化物和溴素等作为合成原料,再使用化学手性拆分剂实现消旋型中间产物的拆分。反应过程存在剧毒化合物、环境污染严重、产品手性纯度低以及高温高压等反应条件苛刻等缺点。与化学合成法相比,生物催化法合成L-2-氨基丁酸具有无可比拟的优势。生物合成主要有两种,一种是酶拆分法,混旋型DL-2-氨基丁酸被相应的酶催化生成L-2-氨基丁酸,但是理论产量只有50%;另一种是酶合成法,底物是苏氨酸,苏氨酸在苏氨酸脱氢酶的作用下生成2-酮丁酸,2-酮丁酸在转氨酶或脱氢酶作用下被还原成L-2-氨基丁酸,该方法存在需要大量的氨基供体、辅因子再生系统和底物价格高的缺点,不适合工业生产。
发明内容
为了解决上述问题,本发明的第一个目的是提供一种生物合成L-2-氨基丁酸的方法,是以L-谷氨酸为底物,以双酶串联体系催化L-谷氨酸生成L-2-氨基丁酸;所述双酶是L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶;所述双酶串联体系中,底物L-谷氨酸的浓度为10-30mmol/L;L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶按照4-6:1的质量比例添加到双酶串联体系中,其中,所述L-天冬氨酸-β-脱羧酶的用量为0.5-5mg/mL。
在本发明的一种实施方式中,所述双酶串联体系中,底物L-谷氨酸的浓度是10-20mmol/L,L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶按照4-6:1的质量比添加到双酶串联体系中。
在本发明的一种实施方式中,L-天冬氨酸-β-脱羧酶的用量为2-3mg/mL。
在本发明的一种实施方式中,所述的双酶串联体系中还含有0.5-1.5mmol/L二硫苏糖醇、0.5-1mmol/L的磷酸吡哆醛、0.01-0.02mmol/L的腺苷钴胺素、1-1.5mmol/Lα-酮戊二酸以及18-22mM pH 6.5-7.5的K2HPO4/KH2PO4缓冲液。
在本发明的一种实施方式中,催化反应的温度为35-39℃,反应10-30h。
在本发明的一种实施方式中,编码所述L-谷氨酸变位酶的基因的核苷酸序列如SEQ ID NO 5所示。
在本发明的一种实施方式中,所述L-天冬氨酸-β-脱羧酶的氨基酸序列如SEQ IDNO.1或SEQ ID NO.2或SEQ ID NO.3或SEQ ID NO.4所示。所述L-天冬氨酸-β-脱羧酶包括K18A/V287I、K18A/V287L、K18S/V287I和K18S/V287L,其中,K18A/V287I的氨基酸序列如SEQID NO.1所示,编码其的核苷酸序列如SEQ ID NO.6所示;K18A/V287L的氨基酸序列如SEQID NO.2所示,编码其的核苷酸序列如SEQ ID NO.7所示;K18S/V287I的氨基酸序列如SEQID NO.3所示,编码其的核苷酸序列如SEQ ID NO.8所示;K18S/V287L的氨基酸序列如SEQID NO.4所示,编码其的核苷酸序列如SEQ ID NO.9所示。
在本发明的一种实施方式中,所述L-谷氨酸变位酶的制备方法,是将核苷酸序列如SEQ ID NO 5所示的编码L-谷氨酸变位酶的基因连接到质粒pET-28a,获得重组质粒pET-28a-GlmES,将该重组质粒装入大肠杆菌BL21,获得重组大肠杆菌BL21/pET-28a-GlmES,以重组大肠杆菌BL21/pET-28a-GlmES生产得到L-谷氨酸变位酶。
在本发明的一种实施方式中,所述生产是:向OD600为0.6-0.8的重组大肠杆菌BL21/pET-28a-GlmES的菌株培养物中,加入IPTG,28-32℃诱导培养15-30h得到菌体。
在本发明的一种实施方式中,所述L-天冬氨酸-β-脱羧酶的制备方法,是将核苷酸序列如SEQ ID NO.6或SEQ ID NO.7或SEQ ID NO.8或SEQ ID NO.9的编码L-天冬氨酸-β-脱羧酶的基因连接到质粒pET-28a,获得重组质粒pET-28a-K18A/V287I或pET-28a-K18A/V287L或pET-28a-K18S/V287I或pET-28a-K18S/V287L,将该重组质粒转入大肠杆菌BL21,获得重组大肠杆菌BL21/pET-28a-K18A/V287I或BL21/pET-28a-K18A/V287L或BL21/pET-28a-K18S/V287I或BL21/pET-28a-K18S/V287L,以该重组菌生产得到L-天冬氨酸-β-脱羧酶。
在本发明的一种实施方式中,所述生产是:向OD600为0.6-0.8的重组大肠杆菌BL21/pET-28a-K18A/V287I或BL21/pET-28a-K18A/V287L或BL21/pET-28a-K18S/V287I或BL21/pET-28a-K18S/V287L的菌株培养物中,加入IPTG,28-32℃诱导培养15-30h得到菌体。
在本发明的一种实施方式中,L-谷氨酸变位酶、L-天冬氨酸-β-脱羧酶的制备方法,还包括:收集培养得到的菌体,进行破碎,分离纯化目的酶蛋白,获得电泳纯的酶。
本发明的有益效果:本发明首次实现以L-谷氨酸为底物,通过双酶串联体系转化为L-2-氨基丁酸,当L-天冬氨酸-β-脱羧酶的用量为2mg/mL,反应24h,转化生成8.5mmol/LL-2氨基丁酸,摩尔转化率为85.00%。本发明采用底物价格低廉,工艺简单,能降低L-2-氨基丁酸的生产成本。
附图说明
图1:L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶催化L-谷氨酸合成L-2-氨基丁酸反应历程。
图2:双酶串联反应示意图。
具体实施方式
L-2-氨基丁酸含量的测定:反应液用苯基异硫酸酯(PITC)衍生,具体步骤为:500μL样品中加入250μL 0.1mol/L PITC乙腈溶液和250μL 1mol/L三乙胺乙腈溶液,充分混匀,避光室温放置1h,加入500μL正己烷溶液,涡旋振荡器振荡1min,静置60min,吸取下层溶液,用0.45μm有机滤膜过滤。衍生产物用HPLC测定:色谱柱为La Chrom C18(5μm,4.6×250mm);流动相A溶液为80%(V/V)乙腈水溶液,B溶液为97:3(V/V,pH 6.5)的0.1mol/L乙酸钠-乙腈溶液;采用梯度洗脱:0-20min,B溶液由95%下降到65%;20-30min,B液由65%上升到95%;30-35min,B溶液梯度不变。检测波长为254nm,柱温为40℃。
LB培养基:蛋白胨10g/L,酵母浸膏5g/L,NaCl 10g/L。
2YT培养基:蛋白胨16g/L,酵母浸膏10g/L,NaCl 5g/L。
L-天冬氨酸-β-脱羧酶酶活的测定方法:反应体系为20mM pH 7.0的K2HPO4/KH2PO4缓冲液、0.2mg/mL L-天冬氨酸-β-脱羧酶、20mmol/L DL-3-甲基天冬氨酸、0.5mmol/L磷酸吡哆醛、1mmol/Lα酮戊二酸,反应体积为0.5mL,于37℃条件下反应30min后,置于100℃灭活10min。12000rpm离心2min,取上清衍生后检测L-2-氨基丁酸产量。酶活定义为每分钟产生1mM L-2-氨基丁酸所需的酶量为一个活力单位。
L-谷氨酸变位酶酶活的测定方法:反应体系为20mM pH 7.0的K2HPO4/KH2PO4缓冲液、0.1mg/mL L-谷氨酸变位酶、10mmol/L L-谷氨酸、0.01mmol/L的腺苷钴胺素、1mmol/L二硫苏糖醇、10mmol/L KCl、1mmol/L MgCl2、0.2mg/mL 3-甲基天冬氨酸裂解酶、0.2mmol/LATP,反应体积为0.5mL,于37℃条件下反应3min后,置于100℃灭活10min。12000rpm离心2min,取上清在OD240测量。酶活定义为每分钟产生1mM 3-甲基天冬氨酸所需的酶量为一个活力单位。
实施例1重组大肠杆菌BL21/pET-28-GlmES的构建
融合性L-谷氨酸变位酶是由来自Clostridium tetanomorphum的glmE亚基和来源于Clostridium cochlearium的mutS亚基通过(甘氨酸-谷氨酰胺)重复的十肽连接,核苷酸序列如SEQ ID NO 5所示,该基因由苏州金唯智公司合成并连接到pET-28a。将重组质粒pET-28a-glmES转化到大肠杆菌BL21菌株,获得重组大肠杆菌BL21/pET-28a-glmES。
实施例2表达L-天冬氨酸-β-脱羧酶的重组大肠杆菌的构建
将核苷酸序列如SEQ ID NO.6或SEQ ID NO.7或SEQ ID NO.8或SEQ ID NO.9所示的编码L-天冬氨酸-β-脱羧酶突变体的基因连接到质粒pET-28a,获得重组质粒pET-28a-K18A/V287I或pET-28a-K18A/V287L或pET-28a-K18S/V287I或pET-28a-K18S/V287L,将该重组质粒转入大肠杆菌BL21,筛选获得重组大肠杆菌BL21/pET-28a-K18A/V287I或BL21/pET-28a-K18A/V287L或BL21/pET-28a-K18S/V287I或BL21/pET-28a-K18S/V287L。
实施例3L-谷氨酸变位酶的表达
将重组大肠杆菌BL21/pET-28a-glmES接种于5mL卡那霉素浓度为50μg/mL的LB培养基,37℃、200rpm振荡过夜培养。将上述过夜培养物按1%的接种量(V/V)接种于含卡那霉素浓度为50μg/mL的2YT培养基,37℃、200rpm振荡培养至菌液OD600至0.6-0.8,加入IPTG至终浓度0.2mmol/L,30℃诱导培养20h左右得到菌体。6000rpm离心收菌后,超声破碎,采用His Trap HP亲合柱进行蛋白纯化,SDS-PAGE检测目标蛋白。
实施例4L-天冬氨酸-β-脱羧酶的表达
将重组大肠杆菌BL21/pET-28a-K18A/V287I、BL21/pET-28a-K18A/V287L、BL21/pET-28a-K18S/V287I、BL21/pET-28a-K18S/V287L分别接种于5mL卡那霉素浓度为50μg/mL的LB培养基,37℃、200rpm振荡过夜培养。将上述过夜培养物按1%的接种量接种于含卡那霉素浓度为50μg/mL的2YT培养基,37℃、200rpm振荡培养至菌液OD600至0.6-0.8,加入IPTG至终浓度0.2mmol/L,30℃诱导培养20h左右得到菌体。6000rpm离心收菌后,超声破碎,采用His Trap HP亲合柱进行蛋白纯化,SDS-PAGE检测目标蛋白。
实施例5双酶串联制备L-2-氨基丁酸
双酶串联体系中,底物L-谷氨酸的浓度是10mmol/L,两种酶按照质量比L-谷氨酸变位酶:L-天冬氨酸-β-脱羧酶为4:1的比例添加到1mL反应体系中,其中L-天冬氨酸-β-脱羧酶的用量为1mg/mL,L-天冬氨酸-β-脱羧酶的酶活力为0.15U,谷氨酸变位酶活力为2.4U,反应体系中还含有1mmol/L二硫苏糖醇、0.5mmol/L的磷酸吡哆醛、0.01mmol/L的腺苷钴胺素、1mmol/Lα-酮戊二酸以及20mM pH 7.0的K2HPO4/KH2PO4缓冲液。37℃,反应24h(反应示意图见图2)。每隔1-2h取样,HPLC检测反应液中的L-2氨基丁酸。结果如图1所示,转化生成5.6mmol/L L-2氨基丁酸,摩尔转化率为56.00%。当L-天冬氨酸-β-脱羧酶的用量为2mg/mL,反应24h,转化生成8.5mmol/L L-2氨基丁酸,摩尔转化率为85.00%。
对比例1
双酶串联体系中,底物L-谷氨酸的浓度是10mmol/L,两种酶按照质量比L-谷氨酸变位酶:L-天冬氨酸-β-脱羧酶为1:1的比例添加到1mL反应体系中,其中L-天冬氨酸-β-脱羧酶的用量为1mg/mL,L-天冬氨酸-β-脱羧酶的酶活力为0.15U,谷氨酸变位酶活力为0.6U,反应体系中还含有1mmol/L二硫苏糖醇、0.5mmol/L的磷酸吡哆醛、0.01mmol/L的腺苷钴胺素、1mmol/Lα-酮戊二酸以及20mM pH 7.0的K2HPO4/KH2PO4缓冲液。37℃,反应24h,转化生成2.8mmol/L L-2氨基丁酸,摩尔转化率为28.00%。
对比例2
双酶串联体系中,底物L-谷氨酸的浓度是10mmol/L,两种酶按照质量比L-谷氨酸变位酶:L-天冬氨酸-β-脱羧酶为2:1的比例添加到1mL反应体系中,其中L-天冬氨酸-β-脱羧酶的用量为1mg/mL,L-天冬氨酸-β-脱羧酶的酶活力为0.15U,谷氨酸变位酶活力为1.2U,反应体系中还含有1mmol/L二硫苏糖醇、0.5mmol/L的磷酸吡哆醛、0.01mmol/L的腺苷钴胺素、1mmol/Lα-酮戊二酸以及20mM pH 7.0的K2HPO4/KH2PO4缓冲液。37℃,反应24h,转化生成4.5mmol/L L-2氨基丁酸,摩尔转化率为45.00%。
对比例3
双酶串联体系中,底物L-谷氨酸的浓度是10mmol/L,两种酶按照质量比L-谷氨酸变位酶:L-天冬氨酸-β-脱羧酶为1:2的比例添加到1mL反应体系中,其中L-天冬氨酸-β-脱羧酶的用量为2mg/mL,L-天冬氨酸-β-脱羧酶的酶活力为0.3U,谷氨酸变位酶活力为0.6U反应体系中还含有1mmol/L二硫苏糖醇,0.5mmol/L的磷酸吡哆醛,0.01mmol/L的腺苷钴胺素,1mmol/Lα-酮戊二酸以及20mM pH 7.0的K2HPO4/KH2PO4缓冲液。37℃,反应24h,转化生成4.6mmol/L L-2氨基丁酸,摩尔转化率为46.00%。
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。
SEQUENCE LISTING
<110> 江南大学
<120> 一种用双酶串联制备L-2-氨基丁酸的方法
<160> 9
<170> PatentIn version 3.3
<210> 1
<211> 533
<212> PRT
<213> 人工序列
<400> 1
Met Gly Asn Val Asp Tyr Ser Lys Tyr Ser Lys Leu Ser Pro Phe Glu
1 5 10 15
Leu Ala Asp Ser Leu Ile Ala Leu Ala Gln Ser Lys Arg Asp Arg Leu
20 25 30
Met Leu Asn Ala Gly Arg Gly Asn Pro Asn Phe Leu Ala Thr Leu Pro
35 40 45
Arg Arg Ala Phe Phe Gln Leu Gly Leu Phe Ser Ala Thr Glu Ser Glu
50 55 60
Phe Ser Phe Ser Tyr Met Pro Glu Gly Leu Gly Gly Phe Pro Arg Pro
65 70 75 80
Val Gly Leu Gln Ser Arg Phe Asp Asn Phe Leu Met Gln Asn Arg Asp
85 90 95
Lys Pro Gly Val Leu Phe Leu Gly Lys Ala Val Ser Tyr Val Arg Asp
100 105 110
Gln Leu Gly Leu Asp Pro Asp Met Phe Leu Leu Glu Met Val Glu Gly
115 120 125
Ile Leu Gly Cys Asn Tyr Pro Val Pro Asp Arg Met Leu Arg Val Ser
130 135 140
Glu Thr Ile Ile Lys Glu Tyr Leu Leu Gln Glu Met Gly Val Lys Ser
145 150 155 160
Met Pro Lys Glu Gly Leu Asp Leu Phe Ala Val Glu Gly Gly Thr Ala
165 170 175
Ala Met Ala Tyr Ile Phe Asn Ser Leu Lys Glu Asn Lys Ile Ile Asn
180 185 190
Thr Asp Asp Arg Ile Ala Ile Gly Arg Pro Ile Phe Thr Pro Tyr Leu
195 200 205
Glu Ile Pro Lys Leu Asn Asp Tyr Gln Leu Glu Glu Ile Phe Ile Glu
210 215 220
Ala Asp Pro Asn Leu Gly Trp Gln Tyr Pro Glu Ser Glu Leu Arg Lys
225 230 235 240
Leu Glu Asp Pro Ser Ile Lys Ala Phe Phe Leu Val Asn Pro Ser Asn
245 250 255
Pro Pro Ser Val Lys Ile Ser Asp Glu Gly Leu Leu Ile Leu Ala Asp
260 265 270
Ile Val Arg Lys Arg Pro Asp Leu Ile Ile Leu Thr Asp Asp Ile Tyr
275 280 285
Gly Thr Phe Ala Asp Asp Phe Lys Ser Leu Phe Ala Ile Cys Pro Asn
290 295 300
Asn Thr Ile Leu Val Tyr Ser Phe Ser Lys Tyr Phe Gly Ala Thr Gly
305 310 315 320
Trp Arg Leu Gly Ile Ile Ala Leu Ser Asn Asn Asn Ile Ile Asp Gln
325 330 335
Lys Ile Ala Ala Leu Ser Asp Gln Glu Lys Gln Glu Leu Glu Glu Arg
340 345 350
Tyr Ser Ser Leu Thr Thr Glu Pro Glu Lys Ile Lys Phe Ile Asp Arg
355 360 365
Leu Val Ala Asp Ser Arg Asn Val Ala Leu Asn His Thr Ala Gly Leu
370 375 380
Ser Thr Pro Gln Gln Val Gln Met Val Leu Phe Ala Leu Phe Asn Met
385 390 395 400
Met Asp Ser Arg Gln Ala Tyr Lys Lys Ala Val Lys Ser Val Val Arg
405 410 415
Glu Arg Asp Ala Ala Leu Tyr Arg Gln Leu Gly Val Glu Val Pro Glu
420 425 430
Asp Leu Asn Ala Val Asp Tyr Tyr Thr Leu Val Asp Leu Glu Arg Thr
435 440 445
Ala Arg Ile Leu Tyr Gly Asp Asp Phe Ala Asn Trp Val Met Val Asn
450 455 460
Lys Asn Pro Thr Glu Leu Leu Phe Arg Val Ala Asp Glu Thr Gly Val
465 470 475 480
Val Leu Leu Pro Gly Ser Gly Phe Gly Val Ser His Pro Ser Ala Arg
485 490 495
Ala Ser Leu Ala Asn Leu Asn Ala Tyr Gln Tyr Ala Ala Ile Gly Asp
500 505 510
Ser Leu Arg Arg Phe Ala Glu Asp Ala Tyr Gln Glu Tyr Leu Gly Thr
515 520 525
Lys Lys Asp Glu Ser
530
<210> 2
<211> 533
<212> PRT
<213> 人工序列
<400> 2
Met Gly Asn Val Asp Tyr Ser Lys Tyr Ser Lys Leu Ser Pro Phe Glu
1 5 10 15
Leu Ala Asp Ser Leu Ile Ala Leu Ala Gln Ser Lys Arg Asp Arg Leu
20 25 30
Met Leu Asn Ala Gly Arg Gly Asn Pro Asn Phe Leu Ala Thr Leu Pro
35 40 45
Arg Arg Ala Phe Phe Gln Leu Gly Leu Phe Ser Ala Thr Glu Ser Glu
50 55 60
Phe Ser Phe Ser Tyr Met Pro Glu Gly Leu Gly Gly Phe Pro Arg Pro
65 70 75 80
Val Gly Leu Gln Ser Arg Phe Asp Asn Phe Leu Met Gln Asn Arg Asp
85 90 95
Lys Pro Gly Val Leu Phe Leu Gly Lys Ala Val Ser Tyr Val Arg Asp
100 105 110
Gln Leu Gly Leu Asp Pro Asp Met Phe Leu Leu Glu Met Val Glu Gly
115 120 125
Ile Leu Gly Cys Asn Tyr Pro Val Pro Asp Arg Met Leu Arg Val Ser
130 135 140
Glu Thr Ile Ile Lys Glu Tyr Leu Leu Gln Glu Met Gly Val Lys Ser
145 150 155 160
Met Pro Lys Glu Gly Leu Asp Leu Phe Ala Val Glu Gly Gly Thr Ala
165 170 175
Ala Met Ala Tyr Ile Phe Asn Ser Leu Lys Glu Asn Lys Ile Ile Asn
180 185 190
Thr Asp Asp Arg Ile Ala Ile Gly Arg Pro Ile Phe Thr Pro Tyr Leu
195 200 205
Glu Ile Pro Lys Leu Asn Asp Tyr Gln Leu Glu Glu Ile Phe Ile Glu
210 215 220
Ala Asp Pro Asn Leu Gly Trp Gln Tyr Pro Glu Ser Glu Leu Arg Lys
225 230 235 240
Leu Glu Asp Pro Ser Ile Lys Ala Phe Phe Leu Val Asn Pro Ser Asn
245 250 255
Pro Pro Ser Val Lys Ile Ser Asp Glu Gly Leu Leu Ile Leu Ala Asp
260 265 270
Ile Val Arg Lys Arg Pro Asp Leu Ile Ile Leu Thr Asp Asp Leu Tyr
275 280 285
Gly Thr Phe Ala Asp Asp Phe Lys Ser Leu Phe Ala Ile Cys Pro Asn
290 295 300
Asn Thr Ile Leu Val Tyr Ser Phe Ser Lys Tyr Phe Gly Ala Thr Gly
305 310 315 320
Trp Arg Leu Gly Ile Ile Ala Leu Ser Asn Asn Asn Ile Ile Asp Gln
325 330 335
Lys Ile Ala Ala Leu Ser Asp Gln Glu Lys Gln Glu Leu Glu Glu Arg
340 345 350
Tyr Ser Ser Leu Thr Thr Glu Pro Glu Lys Ile Lys Phe Ile Asp Arg
355 360 365
Leu Val Ala Asp Ser Arg Asn Val Ala Leu Asn His Thr Ala Gly Leu
370 375 380
Ser Thr Pro Gln Gln Val Gln Met Val Leu Phe Ala Leu Phe Asn Met
385 390 395 400
Met Asp Ser Arg Gln Ala Tyr Lys Lys Ala Val Lys Ser Val Val Arg
405 410 415
Glu Arg Asp Ala Ala Leu Tyr Arg Gln Leu Gly Val Glu Val Pro Glu
420 425 430
Asp Leu Asn Ala Val Asp Tyr Tyr Thr Leu Val Asp Leu Glu Arg Thr
435 440 445
Ala Arg Ile Leu Tyr Gly Asp Asp Phe Ala Asn Trp Val Met Val Asn
450 455 460
Lys Asn Pro Thr Glu Leu Leu Phe Arg Val Ala Asp Glu Thr Gly Val
465 470 475 480
Val Leu Leu Pro Gly Ser Gly Phe Gly Val Ser His Pro Ser Ala Arg
485 490 495
Ala Ser Leu Ala Asn Leu Asn Ala Tyr Gln Tyr Ala Ala Ile Gly Asp
500 505 510
Ser Leu Arg Arg Phe Ala Glu Asp Ala Tyr Gln Glu Tyr Leu Gly Thr
515 520 525
Lys Lys Asp Glu Ser
530
<210> 3
<211> 533
<212> PRT
<213> 人工序列
<400> 3
Met Gly Asn Val Asp Tyr Ser Lys Tyr Ser Lys Leu Ser Pro Phe Glu
1 5 10 15
Leu Ser Asp Ser Leu Ile Ala Leu Ala Gln Ser Lys Arg Asp Arg Leu
20 25 30
Met Leu Asn Ala Gly Arg Gly Asn Pro Asn Phe Leu Ala Thr Leu Pro
35 40 45
Arg Arg Ala Phe Phe Gln Leu Gly Leu Phe Ser Ala Thr Glu Ser Glu
50 55 60
Phe Ser Phe Ser Tyr Met Pro Glu Gly Leu Gly Gly Phe Pro Arg Pro
65 70 75 80
Val Gly Leu Gln Ser Arg Phe Asp Asn Phe Leu Met Gln Asn Arg Asp
85 90 95
Lys Pro Gly Val Leu Phe Leu Gly Lys Ala Val Ser Tyr Val Arg Asp
100 105 110
Gln Leu Gly Leu Asp Pro Asp Met Phe Leu Leu Glu Met Val Glu Gly
115 120 125
Ile Leu Gly Cys Asn Tyr Pro Val Pro Asp Arg Met Leu Arg Val Ser
130 135 140
Glu Thr Ile Ile Lys Glu Tyr Leu Leu Gln Glu Met Gly Val Lys Ser
145 150 155 160
Met Pro Lys Glu Gly Leu Asp Leu Phe Ala Val Glu Gly Gly Thr Ala
165 170 175
Ala Met Ala Tyr Ile Phe Asn Ser Leu Lys Glu Asn Lys Ile Ile Asn
180 185 190
Thr Asp Asp Arg Ile Ala Ile Gly Arg Pro Ile Phe Thr Pro Tyr Leu
195 200 205
Glu Ile Pro Lys Leu Asn Asp Tyr Gln Leu Glu Glu Ile Phe Ile Glu
210 215 220
Ala Asp Pro Asn Leu Gly Trp Gln Tyr Pro Glu Ser Glu Leu Arg Lys
225 230 235 240
Leu Glu Asp Pro Ser Ile Lys Ala Phe Phe Leu Val Asn Pro Ser Asn
245 250 255
Pro Pro Ser Val Lys Ile Ser Asp Glu Gly Leu Leu Ile Leu Ala Asp
260 265 270
Ile Val Arg Lys Arg Pro Asp Leu Ile Ile Leu Thr Asp Asp Ile Tyr
275 280 285
Gly Thr Phe Ala Asp Asp Phe Lys Ser Leu Phe Ala Ile Cys Pro Asn
290 295 300
Asn Thr Ile Leu Val Tyr Ser Phe Ser Lys Tyr Phe Gly Ala Thr Gly
305 310 315 320
Trp Arg Leu Gly Ile Ile Ala Leu Ser Asn Asn Asn Ile Ile Asp Gln
325 330 335
Lys Ile Ala Ala Leu Ser Asp Gln Glu Lys Gln Glu Leu Glu Glu Arg
340 345 350
Tyr Ser Ser Leu Thr Thr Glu Pro Glu Lys Ile Lys Phe Ile Asp Arg
355 360 365
Leu Val Ala Asp Ser Arg Asn Val Ala Leu Asn His Thr Ala Gly Leu
370 375 380
Ser Thr Pro Gln Gln Val Gln Met Val Leu Phe Ala Leu Phe Asn Met
385 390 395 400
Met Asp Ser Arg Gln Ala Tyr Lys Lys Ala Val Lys Ser Val Val Arg
405 410 415
Glu Arg Asp Ala Ala Leu Tyr Arg Gln Leu Gly Val Glu Val Pro Glu
420 425 430
Asp Leu Asn Ala Val Asp Tyr Tyr Thr Leu Val Asp Leu Glu Arg Thr
435 440 445
Ala Arg Ile Leu Tyr Gly Asp Asp Phe Ala Asn Trp Val Met Val Asn
450 455 460
Lys Asn Pro Thr Glu Leu Leu Phe Arg Val Ala Asp Glu Thr Gly Val
465 470 475 480
Val Leu Leu Pro Gly Ser Gly Phe Gly Val Ser His Pro Ser Ala Arg
485 490 495
Ala Ser Leu Ala Asn Leu Asn Ala Tyr Gln Tyr Ala Ala Ile Gly Asp
500 505 510
Ser Leu Arg Arg Phe Ala Glu Asp Ala Tyr Gln Glu Tyr Leu Gly Thr
515 520 525
Lys Lys Asp Glu Ser
530
<210> 4
<211> 533
<212> PRT
<213> 人工序列
<400> 4
Met Gly Asn Val Asp Tyr Ser Lys Tyr Ser Lys Leu Ser Pro Phe Glu
1 5 10 15
Leu Ser Asp Ser Leu Ile Ala Leu Ala Gln Ser Lys Arg Asp Arg Leu
20 25 30
Met Leu Asn Ala Gly Arg Gly Asn Pro Asn Phe Leu Ala Thr Leu Pro
35 40 45
Arg Arg Ala Phe Phe Gln Leu Gly Leu Phe Ser Ala Thr Glu Ser Glu
50 55 60
Phe Ser Phe Ser Tyr Met Pro Glu Gly Leu Gly Gly Phe Pro Arg Pro
65 70 75 80
Val Gly Leu Gln Ser Arg Phe Asp Asn Phe Leu Met Gln Asn Arg Asp
85 90 95
Lys Pro Gly Val Leu Phe Leu Gly Lys Ala Val Ser Tyr Val Arg Asp
100 105 110
Gln Leu Gly Leu Asp Pro Asp Met Phe Leu Leu Glu Met Val Glu Gly
115 120 125
Ile Leu Gly Cys Asn Tyr Pro Val Pro Asp Arg Met Leu Arg Val Ser
130 135 140
Glu Thr Ile Ile Lys Glu Tyr Leu Leu Gln Glu Met Gly Val Lys Ser
145 150 155 160
Met Pro Lys Glu Gly Leu Asp Leu Phe Ala Val Glu Gly Gly Thr Ala
165 170 175
Ala Met Ala Tyr Ile Phe Asn Ser Leu Lys Glu Asn Lys Ile Ile Asn
180 185 190
Thr Asp Asp Arg Ile Ala Ile Gly Arg Pro Ile Phe Thr Pro Tyr Leu
195 200 205
Glu Ile Pro Lys Leu Asn Asp Tyr Gln Leu Glu Glu Ile Phe Ile Glu
210 215 220
Ala Asp Pro Asn Leu Gly Trp Gln Tyr Pro Glu Ser Glu Leu Arg Lys
225 230 235 240
Leu Glu Asp Pro Ser Ile Lys Ala Phe Phe Leu Val Asn Pro Ser Asn
245 250 255
Pro Pro Ser Val Lys Ile Ser Asp Glu Gly Leu Leu Ile Leu Ala Asp
260 265 270
Ile Val Arg Lys Arg Pro Asp Leu Ile Ile Leu Thr Asp Asp Leu Tyr
275 280 285
Gly Thr Phe Ala Asp Asp Phe Lys Ser Leu Phe Ala Ile Cys Pro Asn
290 295 300
Asn Thr Ile Leu Val Tyr Ser Phe Ser Lys Tyr Phe Gly Ala Thr Gly
305 310 315 320
Trp Arg Leu Gly Ile Ile Ala Leu Ser Asn Asn Asn Ile Ile Asp Gln
325 330 335
Lys Ile Ala Ala Leu Ser Asp Gln Glu Lys Gln Glu Leu Glu Glu Arg
340 345 350
Tyr Ser Ser Leu Thr Thr Glu Pro Glu Lys Ile Lys Phe Ile Asp Arg
355 360 365
Leu Val Ala Asp Ser Arg Asn Val Ala Leu Asn His Thr Ala Gly Leu
370 375 380
Ser Thr Pro Gln Gln Val Gln Met Val Leu Phe Ala Leu Phe Asn Met
385 390 395 400
Met Asp Ser Arg Gln Ala Tyr Lys Lys Ala Val Lys Ser Val Val Arg
405 410 415
Glu Arg Asp Ala Ala Leu Tyr Arg Gln Leu Gly Val Glu Val Pro Glu
420 425 430
Asp Leu Asn Ala Val Asp Tyr Tyr Thr Leu Val Asp Leu Glu Arg Thr
435 440 445
Ala Arg Ile Leu Tyr Gly Asp Asp Phe Ala Asn Trp Val Met Val Asn
450 455 460
Lys Asn Pro Thr Glu Leu Leu Phe Arg Val Ala Asp Glu Thr Gly Val
465 470 475 480
Val Leu Leu Pro Gly Ser Gly Phe Gly Val Ser His Pro Ser Ala Arg
485 490 495
Ala Ser Leu Ala Asn Leu Asn Ala Tyr Gln Tyr Ala Ala Ile Gly Asp
500 505 510
Ser Leu Arg Arg Phe Ala Glu Asp Ala Tyr Gln Glu Tyr Leu Gly Thr
515 520 525
Lys Lys Asp Glu Ser
530
<210> 5
<211> 1893
<212> DNA
<213> 人工序列
<400> 5
atggaactta aaaataaaaa atggactgat gaagagtttc ataaacaaag agaagaggta 60
ctacaacaat ggccaactgg taaagaagta gatttacaag aggctgttga ttatttaaag 120
aaaataccag cagaaaagaa ttttgctgaa aaattagttt tagctaagaa aaaaggaata 180
actatggctc aaccaagagc tggagttgct ctattagatg aacatataga attattaaga 240
tatttacaag atgaaggtgg agcagacttt ttaccttcaa caattgatgc ttatacaaga 300
caaaatagat atgacgaatg tgaaaatggt ataaaagaaa gtgaaaaagc aggaagatca 360
ttattaaatg gtttcccagg agttaattat ggtgttaagg gatgtagaaa agttttagaa 420
gcagttaact taccactaca agcaagacac ggtacaccag actcaagatt attagcagaa 480
ataattcacg caggtggatg gacttcaaat gaaggaggag gtatctccta caatgttcca 540
tatgcaaaga atgttacaat agaaaaaagc ttattagatt ggcaatattg tgatagactt 600
gttggtttct atgaagaaca aggtgttcat ataaacagag aaccatttgg tccattgaca 660
ggaacacttg taccaccatc aatgtcaaat gcagttggaa ttacagaagc attacttgca 720
gcagaacaag gtgttaagaa cataacagtt ggatacggtg aatgtggaaa catgatccaa 780
gatatagctg cattaagatg tctagaagaa caaacaaatg aatatttaaa agcttatgga 840
tataatgatg tatttgtaac tacagtattc caccaatgga tgggaggatt cccacaagat 900
gaatcaaagg catttggtgt tatagttaca gctactacta tagcagcttt agcaggagct 960
acaaaagtta tagttaagac tcctcatgaa gcaattggta taccaacaaa agaagcaaat 1020
gctgcaggaa taaaagctac taagatggct ttaaatatgt tagaaggaca aagaatgcca 1080
atgtccaaag aattagaaac tgaaatggct gtaatcaagg ctgaaactaa atgtatcctt 1140
gacaaaatgt ttgaattagg aaagggagat ttagctatag gtacagttaa agcatttgaa 1200
acaggagtta tggatattcc atttggacca agtaaatata atgcaggtaa gatgatgcca 1260
gtaagggata atcttggatg cgttagatac ttagaatttg gaaatgttcc atttactgaa 1320
gaaataaaga attacaacag agaaagatta caagaaagag ccaaatttga aggtagagat 1380
gttagcttcc aaatggttat agatgacata tttgcagttg gaaaaggaag attaattgga 1440
agaccagaag gacaaggaca aggacaagga caaggacaag gagagaaaaa gactattgtt 1500
cttggagtta ttggttcaga ctgtcatgca gttggtaaca aaatattaga ccactcattt 1560
acaaatgcag gcttcaatgt tgttaacata ggagttttat catcacagga agattttata 1620
aatgcagcta tagaaactaa agcagacctt atatgtgttt cttcattata tggacaggga 1680
gaaattgact gtaaaggatt aagagaaaag tgtgatgaag caggacttaa aggaataaaa 1740
ttatttgttg gcggaaacat tgttgttggt aaacaaaact ggccagatgt tgaacagaga 1800
tttaaagcaa tgggatttga tagagtatat ccaccaggaa catctccaga aacaacaata 1860
gctgatatga aagaagtttt aggagtagaa taa 1893
<210> 6
<211> 1599
<212> DNA
<213> 人工序列
<400> 6
atggggaatg tagattattc taaatattca aaacttagcc cattcgagtt agccgatagc 60
ctgattgctt tggcacagag taagcgggac cgcttaatgc tcaatgctgg acgaggaaac 120
cctaattttc tggctaccct gccacgtagg gctttttttc aattaggttt attttctgcc 180
acagaatcag aattttcatt ttcttacatg ccagaaggct taggtgggtt cccccgtcct 240
gtcggtttgc aatcacgttt tgataatttt ctcatgcaga accgggataa acctggagtt 300
ttatttctgg gaaaagcagt gtcttatgtg agagaccaat tgggtttaga tccagatatg 360
tttctgcttg aaatggtcga agggattcta ggatgtaact accctgtacc tgatcgcatg 420
ctccgtgtca gtgaaacaat tattaaagag tatctgttac aggaaatggg cgtaaaaagt 480
atgcccaagg aaggcttgga cctgtttgcg gttgaaggcg gaaccgcagc catggcttat 540
atatttaact ccttaaaaga aaacaagatt attaatactg acgaccgaat tgcaatcggc 600
agaccgattt ttacgccgta tctggaaatt cccaaactga atgactatca gcttgaagaa 660
atttttattg aagctgatcc caatctgggc tggcaatatc ctgagtctga attaagaaag 720
ttagaagacc cttcaatcaa ggcattcttt ttagtcaatc cgagcaaccc gccttctgtc 780
aaaataagtg atgaaggatt gctaatactg gcagatattg taagaaaacg tcctgacctg 840
attattttga cagatgatat ctatggaact tttgcagatg actttaagtc actttttgca 900
atttgcccaa ataatactat tttagtttat tcattctcaa agtactttgg ggctacaggc 960
tggagacttg gcattattgc gctgtcgaat aacaatatca ttgatcagaa gattgcagcg 1020
ctttcagatc aggaaaagca ggaacttgaa gaacgttatt catcattaac tactgaacca 1080
gaaaaaatca agtttattga ccgtttggta gcagatagcc gtaatgttgc actgaatcac 1140
accgcaggtc tgtcaacacc gcagcaggta cagatggttc tttttgccct gtttaatatg 1200
atggattctc gtcaggctta taaaaaagct gtcaagtctg tagtccggga acgcgatgct 1260
gcactttata gacagcttgg tgttgaagtc cctgaagatc ttaacgctgt tgactattac 1320
accttggtag atctggaaag aacagcccgc atattatatg gtgacgattt tgccaactgg 1380
gtcatggtca ataaaaaccc gacagaatta ttatttcggg tagcagatga aaccggtgtc 1440
gttctgttgc caggttctgg ctttggggta tcccatccat cggcacgtgc ttcattagcc 1500
aatctgaatg cttaccaata tgctgcaatc ggtgattctc tacgacgctt tgccgaagat 1560
gcctatcagg aatatctggg aactaaaaaa gatgagtcc 1599
<210> 7
<211> 1599
<212> DNA
<213> 人工序列
<400> 7
atggggaatg tagattattc taaatattca aaacttagcc cattcgagtt agccgatagc 60
ctgattgctt tggcacagag taagcgggac cgcttaatgc tcaatgctgg acgaggaaac 120
cctaattttc tggctaccct gccacgtagg gctttttttc aattaggttt attttctgcc 180
acagaatcag aattttcatt ttcttacatg ccagaaggct taggtgggtt cccccgtcct 240
gtcggtttgc aatcacgttt tgataatttt ctcatgcaga accgggataa acctggagtt 300
ttatttctgg gaaaagcagt gtcttatgtg agagaccaat tgggtttaga tccagatatg 360
tttctgcttg aaatggtcga agggattcta ggatgtaact accctgtacc tgatcgcatg 420
ctccgtgtca gtgaaacaat tattaaagag tatctgttac aggaaatggg cgtaaaaagt 480
atgcccaagg aaggcttgga cctgtttgcg gttgaaggcg gaaccgcagc catggcttat 540
atatttaact ccttaaaaga aaacaagatt attaatactg acgaccgaat tgcaatcggc 600
agaccgattt ttacgccgta tctggaaatt cccaaactga atgactatca gcttgaagaa 660
atttttattg aagctgatcc caatctgggc tggcaatatc ctgagtctga attaagaaag 720
ttagaagacc cttcaatcaa ggcattcttt ttagtcaatc cgagcaaccc gccttctgtc 780
aaaataagtg atgaaggatt gctaatactg gcagatattg taagaaaacg tcctgacctg 840
attattttga cagatgatct ctatggaact tttgcagatg actttaagtc actttttgca 900
atttgcccaa ataatactat tttagtttat tcattctcaa agtactttgg ggctacaggc 960
tggagacttg gcattattgc gctgtcgaat aacaatatca ttgatcagaa gattgcagcg 1020
ctttcagatc aggaaaagca ggaacttgaa gaacgttatt catcattaac tactgaacca 1080
gaaaaaatca agtttattga ccgtttggta gcagatagcc gtaatgttgc actgaatcac 1140
accgcaggtc tgtcaacacc gcagcaggta cagatggttc tttttgccct gtttaatatg 1200
atggattctc gtcaggctta taaaaaagct gtcaagtctg tagtccggga acgcgatgct 1260
gcactttata gacagcttgg tgttgaagtc cctgaagatc ttaacgctgt tgactattac 1320
accttggtag atctggaaag aacagcccgc atattatatg gtgacgattt tgccaactgg 1380
gtcatggtca ataaaaaccc gacagaatta ttatttcggg tagcagatga aaccggtgtc 1440
gttctgttgc caggttctgg ctttggggta tcccatccat cggcacgtgc ttcattagcc 1500
aatctgaatg cttaccaata tgctgcaatc ggtgattctc tacgacgctt tgccgaagat 1560
gcctatcagg aatatctggg aactaaaaaa gatgagtcc 1599
<210> 8
<211> 1599
<212> DNA
<213> 人工序列
<400> 8
atggggaatg tagattattc taaatattca aaacttagcc cattcgagtt atccgatagc 60
ctgattgctt tggcacagag taagcgggac cgcttaatgc tcaatgctgg acgaggaaac 120
cctaattttc tggctaccct gccacgtagg gctttttttc aattaggttt attttctgcc 180
acagaatcag aattttcatt ttcttacatg ccagaaggct taggtgggtt cccccgtcct 240
gtcggtttgc aatcacgttt tgataatttt ctcatgcaga accgggataa acctggagtt 300
ttatttctgg gaaaagcagt gtcttatgtg agagaccaat tgggtttaga tccagatatg 360
tttctgcttg aaatggtcga agggattcta ggatgtaact accctgtacc tgatcgcatg 420
ctccgtgtca gtgaaacaat tattaaagag tatctgttac aggaaatggg cgtaaaaagt 480
atgcccaagg aaggcttgga cctgtttgcg gttgaaggcg gaaccgcagc catggcttat 540
atatttaact ccttaaaaga aaacaagatt attaatactg acgaccgaat tgcaatcggc 600
agaccgattt ttacgccgta tctggaaatt cccaaactga atgactatca gcttgaagaa 660
atttttattg aagctgatcc caatctgggc tggcaatatc ctgagtctga attaagaaag 720
ttagaagacc cttcaatcaa ggcattcttt ttagtcaatc cgagcaaccc gccttctgtc 780
aaaataagtg atgaaggatt gctaatactg gcagatattg taagaaaacg tcctgacctg 840
attattttga cagatgatat ctatggaact tttgcagatg actttaagtc actttttgca 900
atttgcccaa ataatactat tttagtttat tcattctcaa agtactttgg ggctacaggc 960
tggagacttg gcattattgc gctgtcgaat aacaatatca ttgatcagaa gattgcagcg 1020
ctttcagatc aggaaaagca ggaacttgaa gaacgttatt catcattaac tactgaacca 1080
gaaaaaatca agtttattga ccgtttggta gcagatagcc gtaatgttgc actgaatcac 1140
accgcaggtc tgtcaacacc gcagcaggta cagatggttc tttttgccct gtttaatatg 1200
atggattctc gtcaggctta taaaaaagct gtcaagtctg tagtccggga acgcgatgct 1260
gcactttata gacagcttgg tgttgaagtc cctgaagatc ttaacgctgt tgactattac 1320
accttggtag atctggaaag aacagcccgc atattatatg gtgacgattt tgccaactgg 1380
gtcatggtca ataaaaaccc gacagaatta ttatttcggg tagcagatga aaccggtgtc 1440
gttctgttgc caggttctgg ctttggggta tcccatccat cggcacgtgc ttcattagcc 1500
aatctgaatg cttaccaata tgctgcaatc ggtgattctc tacgacgctt tgccgaagat 1560
gcctatcagg aatatctggg aactaaaaaa gatgagtcc 1599
<210> 9
<211> 1599
<212> DNA
<213> 人工序列
<400> 9
atggggaatg tagattattc taaatattca aaacttagcc cattcgagtt atccgatagc 60
ctgattgctt tggcacagag taagcgggac cgcttaatgc tcaatgctgg acgaggaaac 120
cctaattttc tggctaccct gccacgtagg gctttttttc aattaggttt attttctgcc 180
acagaatcag aattttcatt ttcttacatg ccagaaggct taggtgggtt cccccgtcct 240
gtcggtttgc aatcacgttt tgataatttt ctcatgcaga accgggataa acctggagtt 300
ttatttctgg gaaaagcagt gtcttatgtg agagaccaat tgggtttaga tccagatatg 360
tttctgcttg aaatggtcga agggattcta ggatgtaact accctgtacc tgatcgcatg 420
ctccgtgtca gtgaaacaat tattaaagag tatctgttac aggaaatggg cgtaaaaagt 480
atgcccaagg aaggcttgga cctgtttgcg gttgaaggcg gaaccgcagc catggcttat 540
atatttaact ccttaaaaga aaacaagatt attaatactg acgaccgaat tgcaatcggc 600
agaccgattt ttacgccgta tctggaaatt cccaaactga atgactatca gcttgaagaa 660
atttttattg aagctgatcc caatctgggc tggcaatatc ctgagtctga attaagaaag 720
ttagaagacc cttcaatcaa ggcattcttt ttagtcaatc cgagcaaccc gccttctgtc 780
aaaataagtg atgaaggatt gctaatactg gcagatattg taagaaaacg tcctgacctg 840
attattttga cagatgatct ctatggaact tttgcagatg actttaagtc actttttgca 900
atttgcccaa ataatactat tttagtttat tcattctcaa agtactttgg ggctacaggc 960
tggagacttg gcattattgc gctgtcgaat aacaatatca ttgatcagaa gattgcagcg 1020
ctttcagatc aggaaaagca ggaacttgaa gaacgttatt catcattaac tactgaacca 1080
gaaaaaatca agtttattga ccgtttggta gcagatagcc gtaatgttgc actgaatcac 1140
accgcaggtc tgtcaacacc gcagcaggta cagatggttc tttttgccct gtttaatatg 1200
atggattctc gtcaggctta taaaaaagct gtcaagtctg tagtccggga acgcgatgct 1260
gcactttata gacagcttgg tgttgaagtc cctgaagatc ttaacgctgt tgactattac 1320
accttggtag atctggaaag aacagcccgc atattatatg gtgacgattt tgccaactgg 1380
gtcatggtca ataaaaaccc gacagaatta ttatttcggg tagcagatga aaccggtgtc 1440
gttctgttgc caggttctgg ctttggggta tcccatccat cggcacgtgc ttcattagcc 1500
aatctgaatg cttaccaata tgctgcaatc ggtgattctc tacgacgctt tgccgaagat 1560
gcctatcagg aatatctggg aactaaaaaa gatgagtcc 1599

Claims (10)

1.一种生物合成L-2-氨基丁酸的方法,其特征在于,以L-谷氨酸为底物,以双酶串联体系催化L-谷氨酸生成L-2-氨基丁酸;所述双酶是L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶;所述双酶串联体系中,底物L-谷氨酸的浓度为10-30mmol/L;L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶按照4-6:1的质量比添加到双酶串联体系中,其中,所述L-天冬氨酸-β-脱羧酶的用量为0.5-5mg/mL。
2.如权利要求1所述的方法,其特征在于,所述双酶串联体系中,底物L-谷氨酸的浓度是10-20mmol/L,L-谷氨酸变位酶和L-天冬氨酸-β-脱羧酶按照4-6:1的质量比添加到双酶串联体系中。
3.如权利要求1或2所述的方法,其特征在于,所述L-天冬氨酸-β-脱羧酶的用量为2-3mg/mL。
4.如权利要求1所述的方法,其特征在于,所述双酶串联体系中还含有0.5-1.5mmol/L二硫苏糖醇、0.5-1mmol/L的磷酸吡哆醛、0.01-0.02mmol/L的腺苷钴胺素、1-1.5mmol/Lα-酮戊二酸以及18-22mM pH 6.5-7.5的K2HPO4/KH2PO4缓冲液。
5.如权利要求1所述的方法,其特征在于,催化反应的温度为35-39℃,反应10-30h。
6.如权利要求1所述的方法,其特征在于,编码所述L-谷氨酸变位酶的基因的核苷酸序列如SEQ ID NO 5所示。
7.如权利要求1所述的方法,其特征在于,所述L-天冬氨酸-β-脱羧酶的氨基酸序列如SEQ ID NO.1或SEQ ID NO.2或SEQ ID NO.3或SEQ ID NO.4所示。
8.如权利要求1所述的方法,其特征在于,所述L-谷氨酸变位酶的制备方法是:将核苷酸序列如SEQ ID NO 5所示的编码L-谷氨酸变位酶的基因连接到质粒pET-28a上,获得重组质粒pET-28a-GlmES,将该重组质粒装入大肠杆菌BL21,获得重组大肠杆菌BL21/pET-28a-GlmES,以重组大肠杆菌BL21/pET-28a-GlmES发酵生产得到L-谷氨酸变位酶。
9.如权利要求1所述的方法,其特征在于,所述L-天冬氨酸-β-脱羧酶的制备方法是:将核苷酸序列如SEQ ID NO.6或SEQ ID NO.7或SEQ ID NO.8或SEQ ID NO.9的编码L-天冬氨酸-β-脱羧酶的基因连接到质粒pET-28a,获得重组质粒,将该重组质粒转入大肠杆菌BL21,获得重组大肠杆菌,以重组大肠杆菌发酵生产得到L-天冬氨酸-β-脱羧酶。
10.如权利要求8或9所述的方法,其特征在于,L-谷氨酸变位酶、L-天冬氨酸-β-脱羧酶的制备方法还包括:收集培养得到的菌体,进行破碎,分离纯化目的酶蛋白,获得电泳纯的酶。
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