食品科学

• 生物工程 • 上一篇    下一篇

一株抗菌蛋白产生菌的筛选鉴定及其纯化

樊 陈1,高兆建1,*,陈宏伟1,鞠民友2,张桂英3,陈尚龙1   

  1. 1.徐州工程学院食品(生物)工程学院,江苏 徐州 221008;2.江苏太合食品有限公司,江苏 睢宁 221200;
    3.徐州万佳牧业科技发展有限公司,江苏 铜山 221100
  • 出版日期:2013-07-15 发布日期:2013-06-28
  • 通讯作者: 高兆建
  • 基金资助:

    大学生创新创业基金项目(201111);江苏省科技创新与成果转化(重大科技支撑与自主创新)专项引导资金项目(BE2011644);
    江苏省高校自然科学基金项目(KJD180004);徐州市科技计划项目(XF12C005)

Screening and Identification of Antimicrobial Protein-producing Strain

FAN Chen1,GAO Zhao-jian1,*,CHEN Hong-wei1,JU Min-you2,ZHANG Gui-ying3,CHEN Shang-long1   

  1. 1. College of Food(Biological) Engineering, Xuzhou Institute of Technology, Xuzhou 221008, China;
    2. Jiangsu Taihe Food Co. Ltd., Suining 221200, China;3. Wanjia Animal Husbandry Science and
    Technology Development Co. Ltd., Tongshan 221100, China
  • Online:2013-07-15 Published:2013-06-28
  • Contact: GAO Zhao-jian

摘要:

从果园土壤中分离得到一株具有潜在生防效果的拮抗菌,经分子生物学鉴定及生物化学实验检验,确定其 为卡利比克毕赤酵母。该拮抗菌对草莓采后灰霉病和根霉病具有显著的抑制效果,使用拮抗菌的浓度对生物防治效 果有显著影响:拮抗菌浓度越高,腐烂率越低。当卡利比克毕赤酵母浓度为1×109cells/mL,灰葡萄孢和匍枝根霉孢 子浓度分别为1×105spores/mL和5×104spores/mL时,20℃相对湿度92.5%培养3d,灰霉病和根霉病的腐烂率被完全抑 制。该株酵母20℃第1天,4℃前5d能够在伤口处快速增殖。20℃保存5d卡利比克毕赤酵母能够显著腐烂的发生且对草 莓本身的品质参数并没有影响。

关键词: 广谱抗菌蛋白, 枯草芽孢杆菌, 筛选鉴定, 纯化

Abstract:

A new strain, ZHL24, capable of producing broad-spectrum antimicrobial protein was isolated from soil.
The antibacterial protein produced by the strain showed a high inhibitory activity towards many pathogenic bacteria and
fungi such as Escherichia coli, Mirococcus luteus, Pseudomonas aeruginosa, Bacillus cereus, Candida albicans and
Rhizopus stolonifer. This new strain was identified as Bacillus subtilis based on physiological characteristics, biochemical
characteristics and 16S rDNA sequence. The antimicrobial protein was purified to homogeneity through ammonium sulfate
precipitation, ion exchange chromatography (DEAE-Sepharose FF) and gel filtration (Sephadex G-15). SDS-PAGE revealed
a single band at the molecular mass of 26.2 kD. Amino acid composition analysis showed that the antibacterial protein
contained 14 kinds of amino acids.

Key words: broad-spectrum antimicrobial protein, Bacillus subtilis, screening and identification, purification

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