CN113087808A - 一种酿酒酵母表达人rKGF-1-HSA融合蛋白及其标准品的制备方法 - Google Patents
一种酿酒酵母表达人rKGF-1-HSA融合蛋白及其标准品的制备方法 Download PDFInfo
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Abstract
本发明属于生物技术领域,具体涉及一种酿酒酵母表达人rKGF‑1‑HSA融合蛋白的制备方法,包括以下步骤:(1)酿酒酵母分泌表达载体pYES2/CT‑Mfα‑rKGF‑1‑HSA的构建;(2)rKGF‑1‑HSA融合蛋白工程菌的制备、转化;(3)INVSc1/pYES2/CT‑Mfα‑rKGF‑1‑HSA工程菌的诱导表达和纯化。同时还提供了一种酿酒酵母表达长效重组人rKGF‑1‑HSA融合蛋白标准品的制备方法。本发明利用酿酒酵母表达人KGF‑1与HSA融合而成的重组蛋白(rKGF‑1‑HSA),生产工艺简单、成本低、产物均一。
Description
技术领域
本发明属于生物技术领域,具体涉及一种酿酒酵母表达人rKGF-1-HSA融合蛋白及其标准品的制备方法。
背景技术
角质细胞生长因子-1(keratinocyte growth factor-1,KGF-1),最早由R ubin等发现存在于胚胎肺成纤维细胞的培养上清中,是成纤维细胞生长因子(f ibroblastgrowth factors,FGFs)家族的成员之一,又被称为FGF-7。人KG F-1分子量为26-28kDa,分子量的差异是由多肽链结合的糖蛋白不同引起的。人KGF-1的cDNA编码的是1条194个氨基酸(前31个氨基酸编码信号肽)的单链多肽。研究发现在上皮细胞膜上存在其特异性受体FGFR,在间质细胞中产生的KGF-1通过旁分泌途径与其结合,从而促进上皮细胞的增殖与分化。KGF-1的生物学作用主要有促进有丝分裂、促进细胞迁移、调控细胞分化、抗凋亡和细胞保护等作用。
目前KGF-1的获得主要通过两条途径:一是从生物的组织细胞中提取;二是运用基因工程技术构建表达载体,利用宿主表达重组KGF-1。天然提纯KGF-1工艺复杂、成本高,其推广应用受到了限制。而利用基因工程技术表达外源基因已成为获取目的蛋白的高效途径之一,根据表达载体和宿主菌的不同,主要分为原核表达和真核表达。原核表达系统虽成本低廉,但该系统存在容易形成包涵体、获得的蛋白生物学活性较低等缺陷,而利用真核表达系统能够对蛋白进行翻译后修饰,往往能获得较高生物学活性的目的蛋白。
人血清白蛋白(Human serum albumin,HSA)是人体血液中的主要蛋白,由585个氨基酸构成,是人体循环系统内的含量最多的可溶性蛋白,在血液中的浓度为34~54g/L。HSA由肝脏合成,血清半衰期长,可达19天。HSA在调节血液渗透压、营养和促进伤口愈合等方面发挥重要作用,广泛用于肝硬化腹水、烧伤、休克等临床治疗。此外,HSA具有无免疫原性、人体相容性好、组织分布广和无酶活等特性,使其成为非常理想的重组蛋白融合载体。通过构建融合蛋白技术能够增加重组蛋白的分子量从而延长半衰期,有效的提高重组蛋白的稳定性。
对于生物制品来说,其质量评价的有效性指标多采用生物学方法,这些方法本身变异性较大。因此,标准品是生产中必不可少的组成部分,在生物制品标准化、质量控制和效力评价中,标准品是药品质量评价的标尺,起着非常重要的作用。天然提纯KGF-1工艺复杂、成本高,其推广应用受到了限制。而利用基因工程技术表达外源基因已成为获取目的蛋白的高效途径之一,根据表达载体和宿主菌的不同,主要分为原核表达和真核表达。原核表达系统虽成本低廉,但该系统存在容易形成包涵体、获得的蛋白生物学活性较低等缺陷。
发明内容
为克服背景技术中的技术问题,本公司利用酿酒酵母表达的重组人KGF-1与HSA融合而成的重组蛋白(rKGF-1-HSA),生产工艺简单、成本低、产物均一,建立了一种经济、高效、稳定表达的高浓度、高活性的长效重组人KGF-1标准品蛋白,为建立长效人KGF-1蛋白质量标准提供依据。
一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,包含以下步骤:
(1)酿酒酵母分泌表达载体pYES2/CT-Mfα-rKGF-1-HSA的构建,具体包括:
设计并获得KGF-1-HSA基因序列和融合蛋白rKGF-1-HSA的氨基酸序列;
根据rKGF-1-HSA核苷酸序列设计并扩增目的基因,回收并双酶切PCR产物和pYES2/CT-MFα质粒,用T4 DAN连接酶连接,转入E.coli DH5α感受态细胞培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA;
(2)rKGF-1-HSA融合蛋白工程菌的制备、转化,具体包括:
酿酒酵母表达体系常用溶液及培养基的配制;
将步骤(1)获得的pYES2/CT-Mfα-rKGF-1-HSA电转化酿酒酵母INVSc1感受态细胞,通过培养基的培养及PCR扩增、筛选,获得阳性克隆子INVSc1/pYES2/CT-Mfα-rKGF-1-HSA;
(3)INVSc1/pYES2/CT-Mfα-rKGF-1-HSA工程菌的诱导表达和纯化,具体包括:
将步骤(2)获得的阳性克隆子INVSc1/pYES2/CT-MFα-rKGF-1-HSA,通过培养、诱导表达,再依次经过金属离子亲和层析和阴离子交换层析纯化,即得本发明获得的酿酒酵母表达重组人rKGF-1-HSA融合蛋白。
进一步的,所述步骤(1)中,设计并获得KGF-1-HSA基因序列和融合蛋白rKGF-1-HSA的氨基酸序列,具体步骤为:
根据pYES2/CT-MFα载体(图1)的性质和酿酒酵母宿主密码子偏爱性,设计了重组人rKGF-1-HSA基因序列和重组人rKGF-1-HSA的氨基酸序列,重组人rKGF-1-HSA基因序列如序列表1所示,重组人rKGF-1-HSA的氨基酸序列如序列表2所示。
进一步的,所述步骤(1)中,根据rKGF-1-HSA核苷酸序列设计并扩增目的基因,回收并双酶切PCR产物和pYES2/CT-MFα质粒,用T4 DAN连接酶连接,转入E.coli DH5α感受态细胞培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA,具体步骤为:
根据rKGF-1-HSA核苷酸序列设计扩增引物,其中:
正向引物:5'ATAAGAAGCGGCCGCAATGAGCTATGA 3';
反向引物:5'CTAGTCTAGATTAGTGATGGTGATGGTG 3';
进行PCR扩增;
配制1%琼脂糖凝胶,电泳分离PCR扩增产物,紫外灯下快速切下目的条带,用DNA凝胶回收试剂盒回收目的基因PCR扩增产物;
提取DH5α/pYES2/CT-MFα中的pYES2/CT-MFα质粒;
将质粒pYES2/CT-MFα和回收的PCR产物分别用Not I和Xba I进行双酶切,并胶回收双酶切的PCR产物和质粒pYES2/CT-MFα;
将双酶切回收的PCR扩增产物与pYES2/CT-MFα质粒用T4 DNA连接酶在37℃中连接约30min;
将连接产物转化到E.coli DH5α感受态细胞中,经Amp抗性筛选后挑取阳性转化子进行培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA。
进一步的,所述步骤(2)中,酿酒酵母表达体系常用溶液及培养基的配制,具体方法为:
YPD培养基:蛋白胨20g,酵母提取物10g,加水定容至900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%葡萄糖,固体培养基另加琼脂粉2.0%;
SC-U缺陷培养基:YNB无氨基酸氮源6.70g,0.01%氨基酸混合物I1g,0.005%氨基酸混合物II 0.5g,加蒸馏水900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%葡萄糖,固体培养基另加琼脂粉2.0%;
其中,所述0.01%氨基酸混合物I为精氨酸、亮氨酸、苏氨酸、赖氨酸、色氨酸、半胱氨酸和腺嘌呤;所述0.005%氨基酸混合物II为天冬氨酸、丝氨酸、组氨酸、脯氨酸、异亮氨酸、苯丙氨酸、撷氨酸、酪氨酸和甲硫氨酸;
SC-U诱导培养基:蛋白胨20g,酵母提取物10g,加纯化水定容至700ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%半乳糖,固体培养基另加琼脂粉2.0。;
进一步的,所述步骤(2)中,获得阳性克隆子INVSc1/pYES2/CT-Mfα-rKGF-1-HSA的具体步骤为:
采用电转化法将pYES2/CT-Mfα-rKGF-1-HSA转化至酿酒酵母INVSc1感受态细胞:
将10μl pYES2/CT-MFα-rKGF-1-HSA质粒加到80μl酿酒酵母INVScl感受态细胞中,吹吸使其混合均匀,然后转移到预冷的电击杯中,冰浴5min,擦干电击杯外壁;
将Bio-Rad电转化仪调至真菌档,PIC选项,电击杯置于Bio-Rad电转化仪上电击,迅速向电击杯中加入500μl预冷的1M山梨醇溶液,混合均匀,涂SC-U板;
30℃恒温倒置培养,直至长出单克隆;
挑取转化子接种到SC-U液体培养基中,30℃、200rpm恒温培养;
以培养的菌液为模板进行PCR反应,筛选INVSc1/pYES2/CT-Mfα-rKG F-1-HSA阳性克隆子。
进一步的,所述步骤(3)中,INVSc1/pYES2/CT-Mfα-rKGF-1-HSA工程菌的诱导表达,具体步骤为:
挑取INVSc1/pYES2/CT-MFα-rKGF-1-HSA单菌落接种于20ml SC-U选择培养基,经30℃、220rpm震荡培养过夜,测定其OD600nm吸光值,计算好相应体积的菌液转接至于100mlSC-U诱导培养基中,使得初始OD600nm达到0.4,诱导时间为30h;
诱导表达的上清液经离心并通过0.22μm滤膜过滤,收集过滤液液。
进一步的,所述步骤(3)中,金属离子亲和层析的步骤为:
取离心并过0.22μm滤膜过滤后的过滤液,使用GE Healthcare公司Ch elatingSepharose TM Fast Flow镍离子螯合亲和层析填料自行装柱,用3个柱体积的纯化水清洗Ni2+螯合亲和层析柱,再用PBS平衡2-3个柱体积;
在线检测电导率值及280nm波长吸收值,待两者都稳定后开始上样,设置样品经过泵过层析柱的流速5-6ml/min;
再用PBS过层析柱,洗去未与层析柱结合的杂蛋白,直到OD280nm稳定,再以含500mM咪唑PBS缓冲液过层析柱,洗脱并收集洗脱峰对应的蛋白,即得到经过金属离子亲和层析后的重组人rKGF-1-HSA蛋白原液。
进一步的,所述步骤(3)中,阴离子交换层析的步骤为:
将金属离子亲和层析纯化后收集的蛋白原液置换到Tris缓冲液中后上样,通过用Tris缓冲液平衡好的DEAE阴离子交换层析柱,收集rKGF-1-HS A蛋白峰,Tris-NaCl洗脱液洗脱,洗去杂蛋白,即为本发明获得的纯化后的重组人rKGF-1-HSA融合蛋白。
一种重组人rKGF-1-HSA融合蛋白标准品的制备方法,包括以下步骤:
取经过金属离子亲和层析和阴离子交换层析纯化制得的重组人rKGF-1-HSA融合蛋白溶液,用0.22μm滤膜过滤除菌,用10mM磷酸缓冲液稀释后加入终浓度为10%甘油、0.12g/ml甘露醇、0.025g/ml蔗糖冻干保护剂,进行冷冻真空干燥,干燥后即为重组人rKGF-1-HSA融合蛋白标准品。
与现有技术相比,本发明的有益效果是:
本发明利用酿酒酵母分泌表达的长效重组角质细胞生长因子-1与HSA融合而成的重组蛋白(rKGF-1-HSA),提高了重组蛋白的稳定性。酿酒酵母分泌表达系统为真核表达系统,能够高水平表达蛋白质分泌到培养基中,产品生产工艺简单、成本低、产物均一、无免疫原性。
本发明同时制备了检测标准品,在生物制品标准化、质量控制和效力评价中,本发明所建立的经济、高效的rKGF-1-HSA标准品制备方法具有十分积极的意义。
附图说明:
图1质粒pYES2/CT-Mfα图谱;
图2SDS-PAGE鉴定纯化后重组人rKGF-1-HSA蛋白
序列表说明:
序列表1本发明重组人rKGF-1-HSA的核苷酸序列
序列表2本发明重组人rKGF-1-HSA的氨基酸序列
为了更好地理解本发明,下面结合实施例进一步阐明本发明的内容,但本发明的内容不仅仅局限于下面的实施例。
具体实施方式:
实施例1:酿酒酵母分泌表达载体pYES2/CT-Mfα-rKGF-1-HSA的构建
1.1人角质细胞生长因子-1和人血清白蛋白因子的人工优化和获得:
通过GenBank查询获得以下相关基因和氨基酸序列,本次试验将利用目的基因表达的氨基酸序列优化基因序列,再进行人工合成两段基因来构建表达载体。根据pYES2/CT-MFα载体(图1)的性质和酿酒酵母宿主密码子偏爱性,设计重组人rKGF-1-HSA基因序列和重组人rKGF-1-HSA的氨基酸序列,重组人rKGF-1-HSA基因序列如序列表1所示,重组人rKGF-1-HSA的氨基酸序列如序列表2所示。
序列表1中,GCGGCCGC为Not I酶切位点,TCTAGA为Xba I酶切位点;ATG为起始密码子,TAA为终止密码子;GCAGAGGCGGCGGCTA AGGAAGCTGCAGCCAAAGCC为连接KGF-1和HSA序列的Linker所对应的碱基序列;CATCACCATCACCATCAC为6×His标签序列。
1.2pYES2/CT-Mfα-rKGF-1-HSA表达载体的构建
根据rKGF-1-HSA核苷酸序列设计扩增引物,其中:
正向引物:5'ATAAGAAGCGGCCGCAATGAGCTATGA 3';
反向引物:5'CTAGTCTAGATTAGTGATGGTGATGGTG 3'。
PCR条件:95℃预变性5min;95℃变性1min,60℃退火1min,72℃延伸2.5min,共29个循环;72℃最终延伸10min。
配制1%琼脂糖凝胶,电泳分离PCR扩增产物,紫外灯下快速切下目的条带,用DNA凝胶回收试剂盒回收目的基因PCR扩增产物。
在37℃金属浴中酶切3h。酶切后以2%琼脂糖凝胶进行电泳,并胶回收双酶切的PCR产物和质粒。
将双酶切回收的PCR扩增产物与pYES2/CT-MFα质粒用T4 DNA连接酶在37℃中连接约30min。连接体系(10μl):双酶切回收PCR产物5μl、双酶切回收pYES2/CT-MFα片段3μl、T4DNA ligase和10×ligase buffer各1μl。
将连接产物转化到E.coli DH5α感受态细胞中,经Amp抗性筛选后挑取阳性转化子进行培养。利用菌液PCR鉴定基因已成功导入载体,测序获得pYES2/CT-MFα-rKGF-1-HSA载体。
实施例2:rKGF-1-HSA融合蛋白工程菌的制备、转化
2.1酿酒酵母表达体系常用溶液及培养基的配制
YPD培养基:蛋白胨20g,酵母提取物10g,加纯化水定容至900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%葡萄糖,固体培养基另加琼脂粉2.0%;
SC-U缺陷培养基:YNB无氨基酸氮源6.70g,0.01%氨基酸混合物I1g,0.005%氨基酸混合物II 0.5g,加蒸馏水定容至900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%葡萄糖。固体培养基另加琼脂粉2.0%;
其中,所述0.01%氨基酸混合物I为精氨酸、亮氨酸、苏氨酸、赖氨酸、色氨酸、半胱氨酸和腺嘌呤;所述0.005%氨基酸混合物II为天冬氨酸、丝氨酸、组氨酸、脯氨酸、异亮氨酸、苯丙氨酸、撷氨酸、酪氨酸和甲硫氨酸;
SC-U诱导培养基:蛋白胨20g,酵母提取物10g,加纯化水定容至700ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%半乳糖,固体培养基另加琼脂粉2.0%。
2.2pYES2/CT-Mfα-rKGF-1-HSA转化酿酒酵母
采用电转化法将pYES2/CT-Mfα-rKGF-1-HSA转化至酿酒酵母INVSc1感受态细胞。
将10μl pYES2/CT-MFα-rKGF-1-HSA质粒加到80μl酿酒酵母INVScl感受态细胞中,吹吸使其混合均匀,然后转移到预冷的电击杯中。冰浴5min,擦干电击杯外壁。将Bio-Rad电转化仪调至真菌档,电击杯置于Bio-Rad电转化仪上电击。迅速向电击杯中加入500μl预冷的1M山梨醇溶液,混合均匀,涂SC-U固体平板,30℃恒温倒置培养,直至长出单克隆。
挑取转化子接种到SC-U液体培养基中,30℃、200rpm恒温培养。以菌液为模板进行PCR反应,鉴定筛选阳性克隆,由此获得工程菌INVSc1/pYE S2/CT-MFα-rKGF-1-HSA。
实施例3:INVSc1/pYES2/CT-MFα-rKGF-1-HSA工程菌的诱导表达、检定和纯化
3.1工程菌的诱导表达、检定
挑取INVSc1/pYES2/CT-MFα-rKGF-1-HSA单菌落接种于20ml SC-U选择培养基,经30℃、220rpm震荡培养过夜,测定其OD600nm吸光值,计算好相应体积的菌液转接至于100mlSC-U诱导培养基中,使得初始OD600nm达到0.4,诱导时间为30h。
INVSc1/pYES2/CT-MFα-rKGF-1-HSA诱导表达的上清液经SDS-PAGE电泳可观察到约75kDa左右的特异性条带,而含有pYES2/CT-MFα空载质粒的酿酒酵母菌株的诱导表达上清液则无特异性条带(图2,其中,M,Mark er;1,经浓缩的诱导上清;2,含有空载质粒酿酒酵母菌株的诱导上清)。
3.2重组人rKGF-1-HAS融合蛋白的纯化
3.2.1试剂配制
(1)PBS缓冲液:
称上述成分加纯化水溶解,调pH至8.0,定容至1L。
(2)PBS洗脱液:
称上述成分加纯化水溶解,调pH至8.0,定容至1L。
(3)Tris缓冲液:
称上述成分加纯化水溶解,调pH至8.5,定容至1L。
(4)Tris-NaCl洗脱液:
称上述成分加纯化水溶解,调pH至8.5,定容至1L。
3.2.2金属离子亲和层析
离心收集培养液上清,用0.22μm滤膜过滤用以上样。使用GE Healthcar e公司Chelating Sepharose TM Fast Flow镍离子螯合亲和层析填料自行装柱,用3个柱体积的纯化水清洗Ni2+螯合亲和层析柱,再用PBS缓冲液平衡2-3个柱体积。在线检测电导率值及280nm波长吸收值,待两者都稳定后开始上样,设置样品经过泵过层析柱的流速5-6ml/min。再用PBS缓冲液过层析柱,洗去未与层析柱结合的杂蛋白,直到OD280nm稳定。再以PBS洗脱液过层析柱,洗脱并收集洗脱峰对应的蛋白,即得到rKGF-1-HSA蛋白原液。
3.2.2阴离子交换层析
将经过金属离子亲和层析的蛋白原液置换到Tris缓冲液中后上样,通过用Tris缓冲液平衡好的DEAE阴离子交换层析柱,收集rKGF-1-HSA蛋白峰。Tri s-NaCl洗脱液洗脱,洗去杂蛋白,即得本发明获得的酿酒酵母表达重组人rK GF-1-HSA融合蛋白。
实施例4:rKGF-1-HSA标准品的制备和检测
4.1、rKGF-1-HSA标准品的制备
将rKGF-1-HSA纯化后蛋白溶液用0.22μm滤膜过滤除菌,用10mM磷酸缓冲液稀释后加入终浓度为10%甘油、0.12g/ml甘露醇、0.025g/ml蔗糖冻干保护剂,进行冷冻真空干燥。
4.2rKGF-1-HSA标准品的检测
4.2.1蛋白质含量测定
对上述纯化后的rKGF-1-HSA标准品用Lowry法检测蛋白浓度,其蛋白含量为2.0mg/ml。
4.2.2SDS-PAGE进行纯度鉴定
对rKGF-1-HSA标准品进行SDS-PAGE鉴定纯度,其纯度为98%,相对分子量为75kDa。
4.2.3HPLC纯度鉴定
rKGF-1-HSA标准品经μRPC C18 ST 4.6/100反相层析柱进行分析只得到一个主吸收峰,有2个峰为杂峰。
通过计算峰面积得出主峰面积占总面积的99.32%。
4.2.4N-端氨基酸序列测定
将rKGF-1-HSA蛋白样品SDS-PAGE电泳,上样前先将配置好的聚丙烯酰胺凝胶装到垂直电泳仪上,用50V恒压空跑30min。将蛋白电转到PVDF(聚偏氟乙烯)膜上,电转缓冲液用CAPS缓冲液。将PVDF膜放到丽春红染液中染色30min,用水洗去背景颜色。将目的条带剪下放于EP管中,-20℃保存,用Edman降解法进行N端氨基酸测序。
N-端氨基酸序列为EAEAYVEFPRAAAMSYDYME,说明纯化后的目的蛋白确实为rKGF-1-HSA。
综上,本发明利用酿酒酵母表达的长效重组人rKGF-1与HSA融合而成的重组蛋白(rKGF-1-HSA),克服了现有技术中,采用大肠杆菌、乳酸杆菌、短芽孢杆菌及毕赤酵母表达系统容易形成包涵体、获得的蛋白生物学活性较低的缺陷,生产工艺简单、成本低、产物均一;同时,提供了一种重要的重组人rKGF-1-HSA标准品,在生物制品标准化、质量控制和效力评价中,起着非常重要的作用。本发明制备的长效重组人rKGF-1-HSA融合蛋白,具有更好的均一性、稳定性和更好的回收率,可显著降低生产成本。
上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。
序列表
<110> 芜湖英特菲尔生物制品产业研究院有限公司
<120> 一种酿酒酵母表达人rKGF-1-HSA融合蛋白及其标准品的制备方法
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 2322
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 1
gcggccgcaa tgagctatga ctacatggaa ggtggtgata ttagggttag acgtttgttt 60
tgcaggacac aatggtactt gagaattgac aaaagaggta aggttaaagg tacgcaagag 120
atgaagaaca attataacat catggaaatc agaaccgttg ctgtagggat tgtagctatc 180
aaaggcgtgg agtctgaatt ctacttagct atgaacaaag aaggtaaact atacgctaaa 240
aaggagtgca acgaagactg caattttaag gagttaatac tagagaatca ttataacaca 300
tacgctagcg ctaaatggac ccataatggc ggtgaaatgt ttgttgcatt aaatcagaaa 360
ggaattccag tcaggggcaa gaagacaaaa aaagagcaaa aaactgccca ctttttacct 420
atggctataa ctgcagaggc ggcggctaag gaagctgcag ccaaagccat gaagtgggtt 480
acgtttatct ccctattatt tctgttctca tccgcctact ccagaggtgt tttcaggaga 540
gatgctcaca aatctgaggt tgctcataga ttcaaggatt tgggtgaaga aaactttaag 600
gccttagtgt taatagcttt cgcacaatac ctgcaacagt gtccttttga agaccatgtc 660
aaattagtta atgaagtcac cgaatttgct aagacgtgcg ttgctgatga gtctgccgaa 720
aattgtgaca aatcactgca tacattgttc ggtgataagc tatgtaccgt tgcaactctt 780
agagaaacgt acggagagat ggcggactgt tgtgctaaac aagaacctga aagaaatgaa 840
tgttttttgc aacacaaaga tgataatcca aacttgccaa gattggtaag accagaagtt 900
gacgttatgt gtaccgcttt tcatgataat gaagaaacat ttttgaaaaa gtatctttat 960
gaaatagcaa ggaggcatcc ttacttctac gctccagagt tattattttt tgcaaaaaga 1020
tataaggcag cttttactga atgttgtcag gctgcggata aagccgcatg tctgttaccc 1080
aaattggatg aattgagaga cgagggcaaa gctagtagtg ccaaacaaag attaaaatgc 1140
gcttcattac aaaaatttgg agaaagagcg tttaaggctt gggccgtagc aagattgtct 1200
cagagattcc cgaaagccga atttgcagaa gtgagtaaac tggtcacaga tttgacgaaa 1260
gttcacacag aatgttgtca cggagattta ttggaatgcg ctgacgatag ggctgactta 1320
gctaaataca tatgcgagaa tcaagattcc atatcatcaa aattgaaaga atgttgtgag 1380
aaaccattat tagaaaaatc ccactgtata gctgaagttg agaacgatga aatgcccgcg 1440
gatttaccct cccttgcggc tgacttcgtt gagtcaaagg atgtttgcaa gaattacgcg 1500
gaggccaagg atgtttttct tggcatgttt ttatatgagt atgccagacg tcatccggat 1560
tattctgtag ttctactgtt aaggcttgcc aagacatacg aaactacctt agaaaaatgt 1620
tgtgcggctg ccgatccaca tgaatgttac gcaaaagttt ttgatgaatt caagccgctt 1680
gtcgaggagc cacaaaattt aattaaacaa aactgtgaat tatttgaaca attaggtgaa 1740
tataaattcc aaaacgcatt attggtcaga tatacaaaaa aagtacctca ggtttccaca 1800
ccaactttag tggaagtgtc acgtaaccta ggcaaggttg gtagtaagtg ctgtaaacac 1860
ccagaagcta agagaatgcc atgcgctgaa gattatctat cagtcgtact taatcaactg 1920
tgtgtcctac acgagaagac tcctgtcagt gacagagtga caaaatgttg caccgagagc 1980
ttagttaata gaagaccgtg tttttcagcg ctggaagttg atgaaaccta tgttccaaag 2040
gagttcaatg cagaaacatt caccttccat gctgatatat gtactcttag tgaaaaagaa 2100
aggcagatca aaaaacaaac tgccctggtc gaattagtca aacataaacc taaagcaacg 2160
aaggaacagt tgaaggccgt aatggatgat ttcgcagctt tcgttgaaaa atgttgcaag 2220
gctgatgaca aagagacatg ttttgctgaa gagggaaaaa aattggtggc agcttctcaa 2280
gccgctttag ggttacatca ccatcaccat cactaatcta ga 2322
<210> 2
<211> 768
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 2
Met Ser Tyr Asp Tyr Met Glu Gly Gly Asp Ile Arg Val Arg Arg Leu
1 5 10 15
Phe Cys Arg Thr Gln Trp Tyr Leu Arg Ile Asp Lys Arg Gly Lys Val
20 25 30
Lys Gly Thr Gln Glu Met Lys Asn Asn Tyr Asn Ile Met Glu Ile Arg
35 40 45
Thr Val Ala Val Gly Ile Val Ala Ile Lys Gly Val Glu Ser Glu Phe
50 55 60
Tyr Leu Ala Met Asn Lys Glu Gly Lys Leu Tyr Ala Lys Lys Glu Cys
65 70 75 80
Asn Glu Asp Cys Asn Phe Lys Glu Leu Ile Leu Glu Asn His Tyr Asn
85 90 95
Thr Tyr Ala Ser Ala Lys Trp Thr His Asn Gly Gly Glu Met Phe Val
100 105 110
Ala Leu Asn Gln Lys Gly Ile Pro Val Arg Gly Lys Lys Thr Lys Lys
115 120 125
Glu Gln Lys Thr Ala His Phe Leu Pro Met Ala Ile Thr Ala Glu Ala
130 135 140
Ala Ala Lys Glu Ala Ala Ala Lys Ala Met Lys Trp Val Thr Phe Ile
145 150 155 160
Ser Leu Leu Phe Leu Phe Ser Ser Ala Tyr Ser Arg Gly Val Phe Arg
165 170 175
Arg Asp Ala His Lys Ser Glu Val Ala His Arg Phe Lys Asp Leu Gly
180 185 190
Glu Glu Asn Phe Lys Ala Leu Val Leu Ile Ala Phe Ala Gln Tyr Leu
195 200 205
Gln Gln Cys Pro Phe Glu Asp His Val Lys Leu Val Asn Glu Val Thr
210 215 220
Glu Phe Ala Lys Thr Cys Val Ala Asp Glu Ser Ala Glu Asn Cys Asp
225 230 235 240
Lys Ser Leu His Thr Leu Phe Gly Asp Lys Leu Cys Thr Val Ala Thr
245 250 255
Leu Arg Glu Thr Tyr Gly Glu Met Ala Asp Cys Cys Ala Lys Gln Glu
260 265 270
Pro Glu Arg Asn Glu Cys Phe Leu Gln His Lys Asp Asp Asn Pro Asn
275 280 285
Leu Pro Arg Leu Val Arg Pro Glu Val Asp Val Met Cys Thr Ala Phe
290 295 300
His Asp Asn Glu Glu Thr Phe Leu Lys Lys Tyr Leu Tyr Glu Ile Ala
305 310 315 320
Arg Arg His Pro Tyr Phe Tyr Ala Pro Glu Leu Leu Phe Phe Ala Lys
325 330 335
Arg Tyr Lys Ala Ala Phe Thr Glu Cys Cys Gln Ala Ala Asp Lys Ala
340 345 350
Ala Cys Leu Leu Pro Lys Leu Asp Glu Leu Arg Asp Glu Gly Lys Ala
355 360 365
Ser Ser Ala Lys Gln Arg Leu Lys Cys Ala Ser Leu Gln Lys Phe Gly
370 375 380
Glu Arg Ala Phe Lys Ala Trp Ala Val Ala Arg Leu Ser Gln Arg Phe
385 390 395 400
Pro Lys Ala Glu Phe Ala Glu Val Ser Lys Leu Val Thr Asp Leu Thr
405 410 415
Lys Val His Thr Glu Cys Cys His Gly Asp Leu Leu Glu Cys Ala Asp
420 425 430
Asp Arg Ala Asp Leu Ala Lys Tyr Ile Cys Glu Asn Gln Asp Ser Ile
435 440 445
Ser Ser Lys Leu Lys Glu Cys Cys Glu Lys Pro Leu Leu Glu Lys Ser
450 455 460
His Cys Ile Ala Glu Val Glu Asn Asp Glu Met Pro Ala Asp Leu Pro
465 470 475 480
Ser Leu Ala Ala Asp Phe Val Glu Ser Lys Asp Val Cys Lys Asn Tyr
485 490 495
Ala Glu Ala Lys Asp Val Phe Leu Gly Met Phe Leu Tyr Glu Tyr Ala
500 505 510
Arg Arg His Pro Asp Tyr Ser Val Val Leu Leu Leu Arg Leu Ala Lys
515 520 525
Thr Tyr Glu Thr Thr Leu Glu Lys Cys Cys Ala Ala Ala Asp Pro His
530 535 540
Glu Cys Tyr Ala Lys Val Phe Asp Glu Phe Lys Pro Leu Val Glu Glu
545 550 555 560
Pro Gln Asn Leu Ile Lys Gln Asn Cys Glu Leu Phe Glu Gln Leu Gly
565 570 575
Glu Tyr Lys Phe Gln Asn Ala Leu Leu Val Arg Tyr Thr Lys Lys Val
580 585 590
Pro Gln Val Ser Thr Pro Thr Leu Val Glu Val Ser Arg Asn Leu Gly
595 600 605
Lys Val Gly Ser Lys Cys Cys Lys His Pro Glu Ala Lys Arg Met Pro
610 615 620
Cys Ala Glu Asp Tyr Leu Ser Val Val Leu Asn Gln Leu Cys Val Leu
625 630 635 640
His Glu Lys Thr Pro Val Ser Asp Arg Val Thr Lys Cys Cys Thr Glu
645 650 655
Ser Leu Val Asn Arg Arg Pro Cys Phe Ser Ala Leu Glu Val Asp Glu
660 665 670
Thr Tyr Val Pro Lys Glu Phe Asn Ala Glu Thr Phe Thr Phe His Ala
675 680 685
Asp Ile Cys Thr Leu Ser Glu Lys Glu Arg Gln Ile Lys Lys Gln Thr
690 695 700
Ala Leu Val Glu Leu Val Lys His Lys Pro Lys Ala Thr Lys Glu Gln
705 710 715 720
Leu Lys Ala Val Met Asp Asp Phe Ala Ala Phe Val Glu Lys Cys Cys
725 730 735
Lys Ala Asp Asp Lys Glu Thr Cys Phe Ala Glu Glu Gly Lys Lys Leu
740 745 750
Val Ala Ala Ser Gln Ala Ala Leu Gly Leu His His His His His His
755 760 765
Claims (9)
1.一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,包含以下步骤:
(1)酿酒酵母分泌表达载体pYES2/CT-Mfα-rKGF-1-HSA的构建,具体包括:
设计并获得KGF-1-HSA基因序列和融合蛋白rKGF-1-HSA的氨基酸序列;
根据rKGF-1-HSA核苷酸序列设计并扩增目的基因,回收并双酶切PCR产物和pYES2/CT-MFα质粒,用T4 DAN连接酶连接,转入E.coli DH5α感受态细胞培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA;
(2)rKGF-1-HSA融合蛋白工程菌的制备、转化,具体包括:
酿酒酵母表达体系常用溶液及培养基的配制;
将步骤(1)获得的pYES2/CT-Mfα-rKGF-1-HSA电转化至酿酒酵母INVSc1感受态细胞,通过培养基的培养及PCR扩增、筛选,获得阳性克隆子INVSc1/pYES2/CT-Mfα-rKGF-1-HSA;
(3)INVSc1/pYES2/CT-Mfα-rKGF-1-HSA工程菌的诱导表达和纯化,具体包括:
将步骤(2)获得的阳性克隆子INVSc1/pYES2/CT-MFα-rKGF-1-HSA,通过培养、诱导表达,再依次经过金属离子亲和层析和阴离子交换层析纯化,即得本发明获得的酿酒酵母表达人rKGF-1-HSA融合蛋白。
2.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(1)中,设计并获得KGF-1-HSA基因序列和融合蛋白rKGF-1-HSA的氨基酸序列,具体步骤为:
根据pYES2/CT-MFα载体的性质和酿酒酵母宿主密码子偏爱性,设计了人rKGF-1-HSA基因序列和人rKGF-1-HSA的氨基酸序列,人rKGF-1-HSA基因序列如序列表1所示,人rKGF-1-HSA的氨基酸序列如序列表2所示。
3.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(1)中,根据rKGF-1-HSA核苷酸序列设计并扩增目的基因,回收并双酶切PCR产物和pYES2/CT-MFα质粒,用T4 DAN连接酶连接,转入E.coli DH5α感受态细胞培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA,具体步骤为:
根据rKGF-1-HSA核苷酸序列设计扩增引物,其中:
正向引物:5'ATAAGAAGCGGCCGCAATGAGCTATGA 3';
反向引物:5'CTAGTCTAGATTAGTGATGGTGATGGTG 3';
进行PCR扩增;
配制1%琼脂糖凝胶,电泳分离PCR扩增产物,紫外灯下快速切下目的条带,用DNA凝胶回收试剂盒回收目的基因PCR扩增产物;
提取DH5α/pYES2/CT-MFα中的pYES2/CT-MFα质粒;
将质粒pYES2/CT-MFα和回收的PCR产物分别用Not I和Xba I进行双酶切,并胶回收双酶切的PCR产物和质粒pYES2/CT-MFα;
将双酶切回收的PCR扩增产物与pYES2/CT-MFα质粒用T4 DNA连接酶在37℃中连接约30min;
将连接产物转化到E.coliDH5α感受态细胞中,经Amp抗性筛选后挑取阳性转化子进行培养,获得阳性克隆pYES2/CT-Mfα-rKGF-1-HSA。
4.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(2)中,酿酒酵母表达体系常用溶液及培养基的配制,具体方法为:
YPD培养基:蛋白胨20g,酵母提取物10g,加纯化水定容至900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20×葡萄糖,固体培养基另加琼脂粉2.0%;
SC-U缺陷培养基:YNB无氨基酸氮源6.70g,0.01%氨基酸混合物I1g,0.005%氨基酸混合物II 0.5g,加蒸馏水定容至900ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%葡萄糖,固体培养基另加琼脂粉2.0%;
其中,所述0.01%氨基酸混合物I为精氨酸、亮氨酸、苏氨酸、赖氨酸、色氨酸、半胱氨酸和腺嘌呤;所述0.005%氨基酸混合物II为天冬氨酸、丝氨酸、组氨酸、脯氨酸、异亮氨酸、苯丙氨酸、撷氨酸、酪氨酸和甲硫氨酸;
SC-U诱导培养基:蛋白胨20g,酵母提取物10g,加纯化水定容至700ml,121℃高压灭菌20min,冷却至60℃以下,超净台中加入无菌100ml 20%半乳糖,固体培养基另加琼脂粉2.0%。
5.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(2)中,获得阳性克隆子INVSc1/pYES2/CT-Mfα-rKGF-1-HSA的具体步骤为:
采用电转化法将pYES2/CT-Mfα-rKGF-1-HSA转化至酿酒酵母INVSc1感受态细胞:
将10μl pYES2/CT-MFα-rKGF-1-HSA质粒加到80μl酿酒酵母INVScl感受态细胞中,吹吸使其混合均匀,然后转移到预冷的电击杯中,冰浴5min,擦干电击杯外壁;
将Bio-Rad电转化仪调至真菌档,PIC选项,电击杯置于Bio-Rad电转化仪上电击,迅速向电击杯中加入500μl预冷的1M山梨醇溶液,混合均匀,涂SC-U板;
30℃恒温倒置培养,直至长出单克隆;
挑取转化子接种到SC-U液体培养基中,30℃、200rpm恒温培养;
以培养的菌液为模板进行PCR反应,筛选INVSc1/pYES2/CT-Mfα-rKG F-1-HSA阳性克隆子。
6.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(3)中,
INVSc1/pYES2/CT-Mfα-rKGF-1-HSA工程菌的诱导表达,具体步骤为:
挑取INVSc1/pYES2/CT-MFα-rKGF-1-HSA单菌落接种于20ml SC-U选择培养基,经30℃、220rpm震荡培养过夜,测定其OD600nm吸光值,计算好相应体积的菌液转接至于100ml SC-U诱导培养基中,使得初始OD600nm达到0.4,诱导时间为30h;
诱导表达的上清液经离心并通过0.22μm滤膜过滤,收集过滤液。
7.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(3)中,金属离子亲和层析的步骤为:
取离心并过0.22μm滤膜过滤后的过滤液,使用GE Healthcare公司Ch elatingSepharose TM Fast Flow镍离子螯合亲和层析填料自行装柱,用3个柱体积的纯化水清洗Ni2+螯合亲和层析柱,再用PBS平衡2-3个柱体积;
在线检测电导率值及280nm波长吸收值,待两者都稳定后开始上样,设置样品经过泵过层析柱的流速5-6ml/min;
再用PBS过层析柱,洗去未与层析柱结合的杂蛋白,直到OD280nm稳定,再以含500mM咪唑PBS缓冲液过层析柱,洗脱并收集洗脱峰对应的蛋白,即得到经过金属离子亲和层析后的重组人rKGF-1-HSA蛋白原液。
8.根据权利要求1所述的一种酿酒酵母表达人rKGF-1-HSA融合蛋白制备方法,其特征在于,所述步骤(3)中,阴离子交换层析的步骤为:
将金属离子亲和层析纯化后收集的蛋白原液置换到Tris缓冲液中后上样,通过用Tris缓冲液平衡好的DEAE阴离子交换层析柱,收集rKGF-1-HS A蛋白峰,Tris-NaCl洗脱液洗脱,洗去杂蛋白,即为本发明获得的纯化后的重组人rKGF-1-HSA融合蛋白。
9.一种人rKGF-1-HSA融合蛋白标准品的制备方法,其特征在于,包括以下步骤:
取权利要求1-8任一项制备方法制得的人rKGF-1-HSA融合蛋白溶液,用0.22μm滤膜过滤除菌,用10mM磷酸缓冲液稀释后加入终浓度为10%甘油、0.12g/ml甘露醇、0.025g/ml蔗糖冻干保护剂,进行冷冻真空干燥,干燥后即为本发明人rKGF-1-HSA融合蛋白标准品。
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