食品科学 ›› 2013, Vol. 34 ›› Issue (1): 171-174.

• 生物工程 • 上一篇    下一篇

嗜水气单胞菌拮抗芽孢杆菌抗菌素相关基因分析

曹海鹏1,何 珊1,王会聪2,吕利群1,*   

  1. 1.上海海洋大学国家水生动物病原库 2.江苏农林职业技术学院畜牧兽医系
  • 收稿日期:2011-10-12 修回日期:2012-12-13 出版日期:2013-01-15 发布日期:2013-01-07
  • 通讯作者: 曹海鹏 E-mail:hpcao@shou.edu.cn
  • 基金资助:

    现代农业产业技术体系专项

Analysis of Antibiotics Related Genes from Antagonistic Bacillus amyloliquefaciens against Aeromonas hydrophila

Hai-Peng Cao   

  • Received:2011-10-12 Revised:2012-12-13 Online:2013-01-15 Published:2013-01-07
  • Contact: Hai-Peng Cao E-mail:hpcao@shou.edu.cn

摘要: 分别对抗鲟源嗜水气单胞菌的解淀粉芽孢杆菌G1的抗菌素相关基因进行PCR扩增与测序,并对其编码产物的氨基酸序列、跨膜螺旋信号、结构域与二级结构等进行预测与分析。结果表明:菌株G1仅含有伊枯草菌素合成必需基因,该基因与GenBank基因库中芽孢杆菌属其他细菌的伊枯草菌素A、杆菌抗霉素D、抗霉枯草菌素等伊枯草菌素家族基因自然聚类,与枯草芽孢杆菌MH25株和RB14株的伊枯草菌素A基因16S rRNA序列有98%的高度同源性,而且其编码产物的氨基酸序列与GenBank中芽孢杆菌属其他细菌的伊枯草菌素、伊枯草菌素A、脂肽类化合物Bacillorin、芽孢菌素D等抗菌物质的氨基酸序列有高度同源性,与枯草芽孢杆菌MH25的伊枯草菌素A合成酶B(GenBank登录号:ABY89499)的亲缘关系最近。此外,菌株G1伊枯草菌素合成必需基因的编码产物不具有明显的跨膜结构,但其结构域中存在AMP结合位点和PP结合位点,二级结构中存在α螺旋、伸展链、β转角和无规则卷曲。

关键词: 解淀粉芽孢杆菌, 抗菌素相关基因, 伊枯草菌素合成必需基因, 系统发育分析

Abstract: The antibiotics related genes of antagonistic Bacillus amyloliquefaciens G1 against Aeromonas hydrophila isolated from sturgeons were amplified by PCR and sequenced. Meanwhile, the amino acid sequence, transmembrane heices, domains and secondary structure of their encoded products were determined. The results showed that only the gene essential for iturin synthetase was present in strain G1, which was naturally clustered with the iturin gene family from Bacillus sp. in GenBank, including iturin A, bacillomycin D, mycosubtilin, and showed 98% similarity to the iturin A gene sequences of B. subtilis strain MH25 and strain RB14. The amino acid sequence of the encoded product of the iturin synthetase gene exhibited high similarity to that of iturin, iturin A, bacillorin and bacillomycin D, and was close relative to the iturin A synthetase B of B. subtilis strain MH25 (GenBank accession No.ABY89499). In addition, no obvious transmembrane structure was present in the encoded product of the iturin synthetase gene of strain G1. However, both AMP-binding site and PP-binding site were present in its domains. Alpha helix, beta turn, random coil and extended strand were also present in its secondary structure.

Key words: Bacillus amyloliquefaciens, antibiotics related gene, iturin synthetase essential gene, phylogenetic analysis

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