CN105524938A - 珍珠母蛋白n16的制备方法 - Google Patents
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Abstract
本发明公开了一种珍珠母蛋白N16的制备方法。该方法在特定的制备环境中构建了N16-pRhis-BL21(DE3)plysS表达体系,利用基因重组法在细菌中表达珍珠母蛋白N16;采用凝胶排阻层析法,分离纯化,获得高纯度的珍珠母蛋白N16。本发明相对于现有技术具有以下优点:明显提高产量,适于批量生产;且成本低,蛋白纯度高;减少试剂残留,绿色环保。
Description
技术领域
本发明涉及珍珠母蛋白N16的基因重组制备方法。
背景技术
骨质疏松症是指以骨量低及组织微结构退行病变为特征、骨脆性增加和骨折危险度升高的一种全身骨代谢障碍的疾病。该病在中老年人群中尤为常见。据国际骨质疏松基金会的统计数据显示,目前全世界约2亿人患有骨质疏松症,其发病率已跃居常见病、多发病的第七位。我国是世界上人口最多的国家,骨质疏松症发病率在65岁以上的人群中高达90%。随着世界人口的增加和平均寿命的提高,骨质疏松症的威胁将越来越大,为社会医疗体系带来沉重的负担。如何防治骨质疏松症已成为是世界性的难题。
研究报道,珍珠母蛋白具有促进成骨活性,能促进骨损伤修复,显着提高去卵巢大鼠的骨密度,提高新生鼠颅骨的原代培养细胞和MRC-5(人类胎儿成纤维细胞系)细胞的碱性磷酸酶活性,刺激成骨细胞的分化和产生矿化结节,促进骨形成。珍珠母蛋白具有良好的生物相容性,安全性高。在国内外,珍珠母粉被认为是一种良好的骨组织替代材料。珍珠母移植或透皮注射到动物体内无免疫排斥反应或明显毒副作用。
N16是属于珍珠母蛋白,分子量为16kDa,在1999年由Samata等人在珍珠母不溶于水的组分中发现。研究表明,N16能影响碳酸钙结晶的形状。
发明内容
本发明目的在于提供一种珍珠母蛋白N16的基因重组制备方法。
该方法包括下述步骤:
(1)从马氏珠母贝Pinctadafucata中提取总mRNA,经逆转录,产生单链cDNA;根据NCBI数据库N16的基因序列,设计以下引物:N16F(5’-GGAATTCGCTGTCCATTATAAGTGC-3’),和N16R(5’-CGTTAATTGTCAAACCGTTC-3’),其中下划线部位碱基分别为NdeI和BamHI限制性内切酶位点;
(2)利用PCR法扩增N16基因,反应程序设为90~100℃0.5~2分钟,45~60℃20~60秒,72℃0.5~2分钟,共20~40个循环,最后65~75℃5~15分钟;扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysS重组大肠杆菌,用于表达N16蛋白;当BL21(DE3)plysS重组大肠杆菌生长到对数期,加入0.1~1mM异丙基-β-D-硫代吡喃半乳糖苷,25~37℃诱导N16的表达6~16h,收集菌体;
(3)将收集的表达菌体在pH=6.5~8.5的环境下分散在0.01~1MTris-HCl中,超声破碎,离心,弃上清,不溶物以洗涤缓冲液超声溶解,离心,收集不溶物,再以溶解缓冲液室温溶解过夜,离心,取上清,超滤浓缩;以凝胶排阻层析柱对N16进行,收集分液,15%SDS-PAGE检测N16;合并含N16的分液,装入透析袋,以50~150倍体积的0.1~20mM磷酸缓冲液进行去盐复性,得目标产品。
所述步骤(3)中的洗涤缓冲液由1~3M尿素、0.01~1MTris和0.1%吐温-20制成,pH为6.5~8.5;所述的溶解缓冲液由7~8M尿素、0.01~1MTris和5~40mMβ-巯基乙醇制成,pH为6.5~8.5;流动相为7~8M尿素、0.01~1MTris,和5~40mMβ-巯基乙醇制成,pH为6.5~8.5。
本技术的优选方案:所述步骤(2)反应程序设为95℃1分钟,50℃20秒,72℃1分钟,共25个循环,最后72℃10分钟。扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysScompetentEscherichiacoli,用于表达N16蛋白;当BL21(DE3)plysScompetentEscherichiacoli生长到对数期,加入0.4mM异丙基-β-D-硫代吡喃半乳糖苷,37℃诱导N16的表达16h,收集菌体。将表达菌体分散在20mMTris-HCl(pH7.0)中,超声破碎,离心,弃上清;不溶物以洗涤缓冲液(2M尿素,20mMTris,0.1%吐温-20,pH7.0)超声溶解,离心,收集不溶物,再以溶解缓冲液(8M尿素,20mMTris,40mMβ-巯基乙醇,pH7.0)室温溶解过夜,离心,取上清,超滤浓缩,0.45μm滤膜过滤,以Superdex75柱子进行凝胶排阻层析,分离纯化N16,其中,流动相为8M尿素,20mMTris,40mMβ-巯基乙醇,pH7.0,收集分液,15%SDS-PAGE检测N16;合并含N16分液,装入透析袋(透过分子量限制为6000-8000),以100倍体积20mM磷酸缓冲液去盐复性,得目标产品。
本发明与现有技术相比具有以下优势:明显提高产量,适于批量生产;降低经济成本和时间成本;蛋白纯度高,可减少试剂残留,绿色环保。
附图说明:
附图1为本发明实施例制备所得的N16蛋白序列图。
具体实施方式:
下面将用具体的实施例进一步说明本发明的技术。
实施例1:从马氏珠母贝Pinctadafucata中提取总mRNA,经逆转录,产生单链cDNA。根据NCBI数据库N16的基因序列,设计引物N16F(5’-GGAATTCGCTGTCCATTATAAGTGC-3’)和第二个引物N16R(5’-CGTTAATTGTCAAACCGTTC-3’),其中下划线部位碱基分别为NdeI和BamHI限制性内切酶位点。利用PCR法扩增N16基因,反应程序设为95℃1分钟,50℃20秒,72℃1分钟,共25个循环,最后72℃10分钟。扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysScompetentEscherichiacoli,用于表达N16蛋白。当BL21(DE3)plysScompetentEscherichiacoli生长到对数期,加入0.4mMIPTG,37℃诱导N16的表达。16h后,收集菌体。
N16的纯化,将表达菌体分散在20mMTris-HCl(pH7.0)中,超声破碎,离心,弃上清。不溶物以washingbuffer(2Murea,20mMTris,0.1%Tween20,pH7.0)超声溶解。离心,收集不溶物,再以solubilizingbuffer(8Murea,20mMTris,40mMbeta-mercaptoethanol,pH7.0)室温溶解过夜。离心,取上清,超滤浓缩,0.45μm滤膜过滤。以Superdex75柱子进行凝胶排阻层析,分离纯化N16,其中,流动相为8Murea,20mMTris,40mMbeta-mercaptoethanol,pH7.0,15%SDS-PAGE检测N16。合并含N16分液,装入透析袋(透过分子量限制为6000-8000),以100倍体积20mM磷酸缓冲液去盐复性。
重组表达所得到的N16,分子量约为16kDa,与预测结果相吻合。纯度高,无明显可见杂蛋白条带。将制备所得的N16蛋白进行测序,结果如附图1。
实施例2:从马氏珠母贝Pinctadafucata中提取总mRNA,经逆转录,产生单链cDNA。根据NCBI数据库N16的基因序列,设计以下引物N16F(5’-GGAATTCGCTGTCCATTATAAGTGC-3’)和第二个引物16R(5’-CGTTAATTGTCAAACCGTTC-3’),其中下划线部位碱基分别为NdeI和BamHI限制性内切酶位点。利用PCR法扩增N16基因,反应程序设为100℃,2分钟;45℃,60秒;72℃,2分钟;共40个循环,最后65℃,5分钟;扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysScompetentEscherichiacoli,用于表达N16蛋白。当BL21(DE3)plysScompetentEscherichiacoli生长到对数期,加入0.1mMIPTG,25℃诱导N16的表达。16h后,收集菌体。
N16的纯化,将表达菌体分散在0.1mMTris-HCl(pH8.5)中,超声破碎,离心,弃上清。不溶物以washingbuffer(3Murea,1MTris,0.1%Tween20,pH6.5)超声溶解。离心,收集不溶物,再以solubilizingbuffer(7Murea,10mMTris,5mMbeta-mercaptoethanol,pH8.5)室温溶解过夜。离心,取上清,超滤浓缩,0.45μm滤膜过滤。以Superdex75柱子进行凝胶排阻层析,分离纯化N16,其中,流动相为7Murea,10mMTris,5mMbeta-mercaptoethanol,pH8.5,15%SDS-PAGE检测N16。合并含N16分液,装入透析袋(透过分子量限制为6000-8000),以100倍体积20mM磷酸缓冲液去盐复性。
重组表达所得到的,分子量约为16kDa,与预测结果相吻合。纯度高,无明显可见杂蛋白条带。将制备所得的N16蛋白进行测序,结果见图1。
实施3:从马氏珠母贝Pinctadafucata中提取总mRNA,经逆转录,产生单链cDNA。根据NCBI数据库N16的基因序列,设计以下引物N16F(5’-GGAATTCGCTGTCCATTATAAGTGC-3’)和第二个引物N16R(5’-CGTTAATTGTCAAACCGTTC-3’),其中下划线部位碱基分别为NdeI和BamHI限制性内切酶位点。利用PCR法扩增N16基因,反应程序设为90℃,0.5分钟;60℃,20秒;72℃,0.5分钟;共20个循环,最后75℃,15分钟;扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysScompetentEscherichiacoli,用于表达N16蛋白。当BL21(DE3)plysScompetentEscherichiacoli生长到对数期,加入0.1mMIPTG,25℃诱导N16的表达。16h后,收集菌体。
N16的纯化,将表达菌体分散在1MTris-HCl(pH6.5)中,超声破碎,离心,弃上清。不溶物以washingbuffer(1Murea,0.01MTris,0.1%Tween20,pH8.5)超声溶解。离心,收集不溶物,再以solubilizingbuffer(8Murea,1MTris,25mMbeta-mercaptoethanol,pH6.5)室温溶解过夜。离心,取上清,超滤浓缩,0.45μm滤膜过滤。以Superdex75柱子进行凝胶排阻层析,分离纯化N16,其中,流动相为8Murea,1MTris,25mMbeta-mercaptoethanol,pH6.5,15%SDS-PAGE检测N16。合并含N16分液,装入透析袋(透过分子量限制为6000-8000),以100倍体积20mM磷酸缓冲液去盐复性。
重组表达所得到的,分子量约为16kDa,与预测结果相吻合。纯度高,无明显可见杂蛋白条带。将制备所得的N16蛋白进行测序,结果见图1。
Claims (4)
1.一种珍珠母蛋白N16的制备方法,其特征在于包括以下步骤:
(1)从马氏珠母贝Pinctadafucata中提取总mRNA,经逆转录,产生单链cDNA;根据NCBI数据库N16的基因序列,设计以下引物:N16F(5’-GGAATTCGCTGTCCATTATAAGTGC-3’),和N16R(5’-CGTTAATTGTCAAACCGTTC-3’),其中下划线部位碱基分别为NdeI和BamHI限制性内切酶位点;
(2)利用PCR法扩增N16基因,反应程序设为90~100℃0.5~2分钟,45~60℃20~60秒,72℃0.5~2分钟,共20~40个循环,最后65~75℃5~15分钟;扩增所得N16基因连接到表达载体pRhisMBP上,并导入BL21(DE3)plysS重组大肠杆菌,用于表达N16蛋白;当BL21(DE3)plysS重组大肠杆菌生长到对数期,加入0.1~1mM异丙基-β-D-硫代吡喃半乳糖苷,25~37℃诱导N16的表达6~16h,收集菌体;
(3)将收集的表达菌体在pH=6.5~8.5的环境下分散在0.01~1MTris-HCl中,超声破碎,离心,弃上清,不溶物以洗涤缓冲液超声溶解,离心,收集不溶物,再以溶解缓冲液室温溶解过夜,离心,取上清,超滤浓缩;以凝胶排阻层析柱对N16进行,收集分液,15%SDS-PAGE检测N16;合并含N16的分液,装入透析袋,以50~150倍体积的0.1~20mM磷酸缓冲液进行去盐复性,得目标产品。
2.如权利要求书1所述的方法,其特征在于:所述步骤(3)中的洗涤缓冲液由1~3M尿素、0.01~1MTris和0.1%吐温-20制成,pH为6.5~8.5;所述的溶解缓冲液由7~8M尿素、0.01~1MTris和5~40mMβ-巯基乙醇制成,pH为6.5~8.5;流动相为7~8M尿素、0.01~1MTris,和5~40mMβ-巯基乙醇制成,pH为6.5~8.5。
3.如权利要求书1所述的方法,其特征在于:所述步骤(3)中透析袋的透过分子量限制为6000-8000。
4.如权利要求1所述的方法,其特征在于:所述步骤(2)反应程序设为95℃1分钟,50℃20秒,72℃1分钟,共25个循环,最后72℃10分钟;异丙基-β-D-硫代吡喃半乳糖苷的用量为0.4mM,在37℃诱导N16的表达16h;所述步骤(3)中表达菌体的分散环境是pH7.0,分散于20mMTris-HCl中;所述洗涤缓冲液由2M尿素,20mMTris和0.1%吐温-20制成,pH为7.0;溶解缓冲液由8M尿素,20mMTris和40mMβ-巯基乙醇,pH为7.0;0.45μm滤膜过滤,以Superdex75柱子进行凝胶排阻层析;流动相为8M尿素,20mMTris,40mMβ-巯基乙醇,pH7.0;透析袋的透过分子量限制为6000-8000;以100倍体积20mM磷酸缓冲液去盐复性。
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