CN115558613A - 一种提高诱导眼镜王蛇抗菌肽oh-cath30表达效率的培养基及其配制方法 - Google Patents
一种提高诱导眼镜王蛇抗菌肽oh-cath30表达效率的培养基及其配制方法 Download PDFInfo
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Abstract
本发明提供了一种提高诱导眼镜王蛇抗菌肽OH‑CATH30表达效率的培养基、配制方法,所述培养基的每1000mL体系中,培养基组成包括:葡萄糖20g,二水硫酸钙0.186g,硫酸钾3.6g,七水硫酸镁2.98g,氢氧化钾0.826g,85%磷酸5.34ml,PTM1 4ml,氨基酸10g,余量为去离子水,上述氨基酸为组氨酸、亮氨酸、缬氨酸或苏氨酸。使用本发明的培养基,利用毕氏酵母菌表达重组蛋白时,能够明显提高毕赤酵母的生长速度,生长18h后即可进入诱导阶段,显著提高眼镜王蛇抗菌肽OH‑CATH30诱导表达效率,且诱导表达后得到的重组蛋白的活性和稳定性。
Description
技术领域
本发明涉及生物技术领域,具体地,涉及一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基及其配制方法。
背景技术
cathelicidins是一种在先天免疫系统中发挥重要作用的阳离子宿主防御肽,眼镜王蛇抗菌肽OH-CATH30为cathelicidins的截短肽,由30个氨基酸序列组成,目前研究发现其对大肠杆菌(Escherichia coli)、铜绿假单胞菌(Pseudomona aeruginosa)、金黄色葡萄球菌(Staphylococcus aureus)和产气肠杆菌(Enterobacter aerogenes)等多种革兰氏阴性菌和革兰氏阳性菌均具有较好的抑菌效果。
目前眼镜王蛇抗菌肽OH-CATH30基因工程表达制备方法中,表达常用的培养基是BSM培养基,以BSM为基础培养基高密度培养毕赤酵母时,存在酵母生长速度较慢、蛋白表达量低等缺点。在眼镜王蛇抗菌肽OH-CATH30制备过程中,发现蛋白表达水平较低,且生物活性也降低了。基于上述表达过程中存在的问题,亟需通过调整优化培养基成分、培养条件等技术来加快毕赤酵母生长速度,提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率、增加表达量及提高产物稳定性。
发明内容:针对现有技术中的缺陷,本发明的目的是提供一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基及其配制方法。
发明内容
针对现有技术中的缺陷,本发明的目的是提供一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基及其配制方法。
本发明的目的是通过以下方案实现的:
本发明第一方面提供一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基配方,所述培养基的每1000mL体系中,培养基组成包括:葡萄糖20g,二水硫酸钙0.186g,硫酸钾3.6g,七水硫酸镁2.98g,氢氧化钾0.826g,85%磷酸5.34ml,PTM1 4ml,氨基酸10g,余量为去离子水。可用于提高眼镜王蛇抗菌肽OH-CATH30诱导表达效率。
优选的,所述氨基酸为组氨酸、亮氨酸、缬氨酸或苏氨酸。
本发明的第二方面提供一种上述所述的提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基的配制方法,包括如下步骤:
S1:按常规方法配制将除上述氨基酸和PTM1的培养基配方,所述除氨基酸和PTM1的培养基配方材料灭菌后待用。
S2:含氨基酸培养基的配制,将氨基酸按10g/L的添加量称量好,添加至上述S1中待用的BSM培养基中,振荡、加热使其溶解。
S3:调pH和抽滤,在无菌室中,加入氨水将pH调至5.0后,在超净工作台抽滤后添加4ml的PTM1,用灭菌去离子水定容至1000mL得到用于提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基。
本发明的第三方面提供一种上述所述的提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基的应用,将上述所述培养基用于表达眼镜王蛇抗菌肽OH-CATH30,将含有表达质粒的毕赤酵母菌接种至第一方面所述的培养基中,29℃培养18小时就可进入诱导阶段,诱导阶段29℃培养24h-48h,然后将菌液离心取上清液,过0.22μm滤膜后得到表达量提高的表达液。
本发明优点:
1.使用本发明培养基,能够明显提高毕赤酵母的生长速度,较快的进入诱导阶段,显著提高眼镜王蛇抗菌肽OH-CATH30诱导表达效率。
2.在BSM培养基中添加组氨酸、亮氨酸、缬氨酸或苏氨酸,组氨酸、亮氨酸、缬氨酸或苏氨酸均是眼镜王蛇抗菌肽OH-CATH30的组成部分,上述4种氨基酸都可以直接被酵母吸收利用,提高表达量且有明显的抑菌效果。
3.使用本发明优化培养基诱导表达后,能够提高眼镜王蛇抗菌肽OH-CATH30的活性及稳定性。
具体实施方式:
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明,但不以任何形式限制本发明。应当指出的是,对本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变化和改进。这些都属于本发明的保护范围。
本发明提供一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基,为眼镜王蛇抗菌肽OH-CATH30大规模发酵提供基础。
实施例1:培养基组分的优化
①.添加不同氨基酸的培养基对毕赤酵母菌生长速度影响的实验
对葡萄糖,二水硫酸钙,硫酸钾,七水硫酸镁,氢氧化钾,85%磷酸,PTM1,氨基酸进行优化试验,实验步骤参考实施例2。具体5种氨基酸添加方式对毕赤酵母菌生长速度影响实验数据如表1所示:
表1:添加5种氨基酸对毕赤酵母菌生长速度影响实验数据
由上述试验结果可以得知,生长阶段分别添加缬氨酸、组氨酸、苏氨酸或亮氨酸都能够提高重组毕赤酵母菌的生长速度,添加量都为10g/L,pH=5,接种10%,29℃培养18h即可。
实施例2:配制培养基
(1).试剂与材料
葡萄糖购于临沂市兰山区丰源食品添加剂经营部;
赖氨酸、苯丙氨酸购于广州康荻尔生物科技有限公司;
二水硫酸钙、硫酸钾、胰蛋白胨、酵母浸膏、氢氧化钠、氨水、二水钼酸钠、浓硫酸、五水硫酸铜、硼酸购于国药集团;
七水硫酸镁、氢氧化钾、85%磷酸、七水硫酸铁购于天津市福晨化学试剂厂;
碘化钾购于西胧科学股份有限公司;六水氯化钴购于无锡市亚泰联合化工有限公司;生物素购于生工生物工程(上海)股份有限公司;氯化锌购于无锡市亚泰联合化工有限公司;一水硫酸锰购于江苏强盛功能化学股份有限公司;
(2).配制培养基
①.配制YPD基础培养基:
a:称取6g胰蛋白胨、3g酵母浸膏,加入270ml纯水溶解,用1M氢氧化钠溶液调整pH至7,121℃高压灭菌 20min;
b:称取20g葡萄糖,加入60ml纯水溶解后定容至100ml,108℃高压灭菌 30min,得到20%(W/V)质量浓度葡萄糖溶液;
c:在步骤1中所配制的溶液,缓慢加入30ml的20%(W/V)质量浓度葡萄糖溶液,得到基础培养基YPD。
②.配制BSM培养基:
a:称取20g葡萄糖、0.186g二水硫酸钙、3.6g硫酸钾、2.98g七水硫酸镁、0.826g氢氧化钾,加入800 mL去离子水溶解,加入5.34 mL 85%磷酸,定容至1000 mL,121℃高压灭菌20min;
b:称取3g上述氨基酸,加入300 mL步骤(1)所配制的溶液中,65℃加热使其溶解,用氨水调整pH 到5.0,过0.22μm滤膜,待用;
c:配制PTM1溶液,称取6g五水硫酸铜、0.08g碘化钾、3g一水硫酸锰、0.2g二水钼酸钠、0.02g硼酸、0.5g六水氯化钴、20g氯化锌、65g七水硫酸铁、0.2g生物素、5mL浓硫酸,加入800 mL纯水溶解,定容至1000 mL,得到微量盐溶液PTM1;
d:取1.2 mL PTM1 加入到步骤b所配制待用的溶液中,得到BSM培养基。
实施例3:眼镜王蛇抗菌肽OH-CATH30的表达实验
(1)眼镜王蛇抗菌肽OH-CATH30的生长期扩增
a:挑取含有表达质粒的毕赤酵母菌单菌落,接种于20 mLYPD培养基中,29℃,220rpm培养16h,制得一级种子液;
b:按1%的比例将一级种子液接种于100 mL YPD培养基中,29℃,220rpm扩大培养16h,制得二级种子液;
c:按10%的比例将二级种子液接种于300mL实施例2中配制的BSM培养基中,29℃,220rpm培养66h。
(2)眼镜王蛇抗菌肽OH-CATH30的诱导期表达
a:将上述5种添加不同氨基酸的培养基分别添加甲醇、山梨醇,对重组酵母开始诱导表达。
(3)进行抑菌实验
a:收集24h、48h表达液,过0.22μm滤膜去除大分子后做金黄色葡萄球菌(Staphylococcus aureus)、蜡状芽孢杆菌(Bacillus cereus)、铜绿假单胞菌(Pseudomona aeruginosa)、嗜水气单胞菌(Aeromonas hydrophila)4种病原菌的平板抑菌实验,37℃培养约16h后取出观察抑菌圈的大小。结果如表2和表3。
表2:24h表达液的抑菌圈大小
表3:48h表达液的抑菌圈大小
注:“/”表示表达量过低不足以达到抑菌效果。
结果显示:分别添加的组氨酸、亮氨酸、缬氨酸或苏氨酸,在生长阶段能够提高重组毕赤酵母的生长速度,培养18小时就可进入诱导阶段,提高重组酵母诱导表达效率,但异亮氨酸的效果不明显。重组酵母表达24、48h后取其表达液进行抑菌实验,均对金黄色葡萄球菌(Staphylococcus aureus)有明显抑制作用,添加组氨酸、亮氨酸、缬氨酸或苏氨酸均对铜绿假单胞菌(Pseudomona aeruginosa)有明显抑制作用,添加组氨酸对嗜水气单胞菌(Aeromonas hydrophila)有明显抑制作用,添加异亮氨酸、缬氨酸或苏氨酸均对蜡状芽孢杆菌(Bacillus cereus)有抑制作用。
Claims (3)
1.一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基,其特征在于所述培养基的每1000mL体系中,培养基组成包括:葡萄糖20g,二水硫酸钙0.186g,硫酸钾3.6g,七水硫酸镁2.98g,氢氧化钾0.826g,85%磷酸5.34ml,PTM1 4ml,氨基酸10g,余量为去离子水。
2.根据权利要求1所述的一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基,其特征在于所述氨基酸为组氨酸、亮氨酸、缬氨酸或苏氨酸。
3.根据权利要求1所述的一种提高诱导眼镜王蛇抗菌肽OH-CATH30表达效率的培养基的配制方法,其特征在于,所述配制方法步骤如下:
S1:按常规方法配制将除上述氨基酸和PTM1的培养基配方,所述除氨基酸和PTM1的培养基配方材料灭菌后待用;
S2:含氨基酸培养基的配制,将氨基酸按10g/L的添加量称量好,添加至上述S1中待用的BSM培养基中,振荡、加热使其溶解;
S3:调pH和抽滤,在无菌室中,加入氨水将pH调至5.0后,在超净工作台抽滤后添加4ml的PTM1,用灭菌去离子水定容至1000mL得到所述培养基。
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