betway必威登陆网址 (betway.com )学报››2023,Vol. 44››Issue (3): 202-208.DOI:10.3969/j.issn.2097-0005.2023.03.008

• 基础研究 •上一篇下一篇

质粒DNA实验室规模化制备工艺

贲培玲(), 陈容前, 孙淼, 施向阳

  1. 滁州城市职业学院医学系,安徽 滁州 239000
  • 收稿日期:2022-08-03出版日期:2023-04-24发布日期:2023-04-24
  • 作者简介:贲培玲,博士,副教授,研究方向:生物化学,E-mail:bpl422@163.com
  • 基金资助:
    安徽省高校优秀青年人才培育资助项目(gxyqZD2019131);安徽省级质量工程项目(2020szsfkc0656);滁州城市职业学院提质培优项目(2021tsxjd01);滁州城市职业学院质量工程项目(2020kcsfk03)

Preparation technology of plasmid DNA in laboratory scale

Peiling BEN(), Rongqian CHEN, Miao SUN, Xiangyang SHI

  1. Department of Medicine,Chuzhou City Vocational College,Chuzhou 239000,China
  • Received:2022-08-03Online:2023-04-24Published:2023-04-24

摘要:

目的探索实验室规模生产质粒DNA(plasmid DNA,pDNA)的制备工艺。方法选用质粒pEGFP-N1E.coliStbl3菌株,用最陡爬坡试验(plackett-burman,PB)筛选出影响质粒产量最显著因素,响应面法优化重组菌高产发酵条件。采用碱裂解,浓缩质粒,通过凝胶、亲和、离子等层析分离纯化pDNA,并对所纯化的pDNA进行质量评价。结果用PB试验和响应面试验设计筛选出的关键因素是:酵母提取物20 g/L,甘油6 g/L,接种物浓度吸光度(optical density,OD) = 0.014。在最佳条件下进行3次平行发酵,生物量OD 600达28.07 ± 2.01,质粒产量(21.34 ± 1.31) mg/L。pDNA纯度(A260 nm/A280 nm)为1.91 ± 0.02。内毒素含量小于0.005 EU/g DNA;几乎检测不到蛋白质及细菌基因组DNA残留,达到相关质量标准。结论本研究采用的制备工艺可生产出高质量的pDNA。

关键词:质粒DNA,响应面,实验室规模发酵,纯化,质量评价

Abstract:

ObjectiveTo explore the preparation technology of plasmid DNA (pDNA) in laboratory scale production.MethodsPlasmid pEGFP-N1E.coliStbl3 strain was selected, and the most significant factors affecting plasmid yield were screened by plackett-burman test, and the high yield fermentation conditions of recombinant bacteria were optimized by response surface method. The plasmid DNA was isolated and purified by alkaline lysis, concentration of plasmid, gel, affinity and ion chromatography, and the quality of purified pDNA was evaluated.ResultsThe key factors selected by steepest climbing test and response surface test design were yeast extract 20 g/L, glycerol 6 g/L and inoculum concentration OD = 0.014. Under the optimum conditions, the biomass OD 600 and plasmid yield were (28.07 ± 2.01) and (21.34 ± 1.31) mg/L respectively. The purity of plasmid DNA (A260 nm/A280 nm) was (1.91 ± 0.02). When the content of endotoxin was less than that of 0.005 EU/g DNA; there was almost no protein or bacterial genomic DNA residue. All the indicators met the relevant quality standards.ConclusionThe high quality pDNA can be produced by the preparation process.

Key words:plasmid DNA,response surface methodology,lab-scale fermentation,purification,quality evaluation