华西口腔医学杂志

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变链素的纯化

杨柳1 许晓芳1 杨佰霞2 柳雯1 李颂1   

  1. 1.安徽医科大学口腔医学院口腔内科教研室; 2.安徽医科大学第一附属医院检验科, 安徽合肥230032
  • 收稿日期:2010-10-25 修回日期:2010-10-25 出版日期:2010-10-20 发布日期:2010-10-20
  • 通讯作者: 李颂,Tel:15155113796
  • 作者简介:杨柳(1982—),女,河南人,硕士
  • 基金资助:

    国家自然科学基金资助项目(30640074);安徽省教育厅重点基金资助项目(KJ2007A027);安徽医科大学博士基金资助项目(2004)

Purification of mutacin

YANG Liu1, XU Xiao-fang1, YANG Bai-xia2, LIU Wen1, LI Song1   

  1. 1. Dept. of Endodontics, College of Stomatology, Anhui Medical University, Hefei 230032, China; 2. Dept. of Clinical Laboratory, The First Affiliated Hospital of Anhui Medical University, Hefei 230032, China
  • Received:2010-10-25 Revised:2010-10-25 Online:2010-10-20 Published:2010-10-20
  • Contact: LI Song,Tel:15155113796

摘要:

目的从变异链球菌临床株中分离纯化变链素,为进一步从分子水平研究变链素奠定基础。方法通过抑菌活性检测,从变异链球菌临床株中选择出抑菌活性较强的菌株。用氯仿抽提法从该菌株培养液中粗提变链素,经固相萃取和反相高效液相色谱(RP-HPLC)对粗提物进行纯化。结果获得变链素活性较强的菌株1G。从其200 mL液体培养基中粗提出变链素约15 μg,经固相萃取柱洗脱,再经过RP-HPLC的2次纯化,得到有抑菌活性的成分,此为纯化的变链素。结论变链素相对分子质量小,分离提纯步骤复杂,本实验得到纯化的变链素,为下一步研究变链素的氨基酸序列和基因序列奠定了基础。

关键词: 变异链球菌, 变链素, 反相高效液相色谱

Abstract:

Objective To purify mutacin produced from isolated Streptococcus mutans (S.mutans) strains in order to, contribute to molecular biological research of mutacin. Methods The antibacterial activity of 80 isolated strains was tested by the stab culture technique against Streptococcus oralis ATCC 10557. The mutacin produced by strain 1G, was initially purified by solid-phase extraction(SPE) after crude extraction by chloroform. And then the active substances were purified by twice reversed-phase high performance liquid chromatography(RP-HPLC). The purified target peptide(mutacin) was collected and freeze-dried for further study. Results The greatest active strain of these S.mutans isolates, the strain 1G was obtained. Roughly 15 μg crude mutacin was extracted from 200 mL liquid medium of this strain 1G. The purified mutacin through SPE and twice RP-HPLC was obtained. Conclusion It was much complex to separate and purify mutacin due to its small moleculer mass, and extracting and purifying of mutacin may make an important contribution to the further research of mutacin.

Key words: Streptococcus mutans, mutacin, reversed-phase high performance liquid chromatography