›› 2011, Vol. 38 ›› Issue (1): 95-99.

• 生物技术 • 上一篇    下一篇

植物乳杆菌α-半乳糖苷酶基因(melA)的克隆与序列分析

任大勇1,2,3,李昌2,秦艳青2,3,杜寿文1,2,胡博1,2,金宁一2   

  1. (1.吉林大学农学部畜牧兽医学院,吉林长春 130062; 2.军事医学科学院军事兽医研究所,吉林长春 130062;3.吉林农业大学食品科学与工程学院,吉林长春 130118)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-01-01 发布日期:2011-01-01
  • 通讯作者: 金宁一

Cloning and Sequence Analysis of the α-galactosidase Gene (melA)from L. plantarum

REN Da-yong1,2,3,LI Chang2,QIN Yan-qing2,3,DU Shou-wen1,2,HU Bo1,2,JIN Ning-yi2   

  1. (1.College of Animal and Veterinary Medicine,Jilin University, Changchun 130062, China;2.Military Veterinary Institute, Academy of Military Medical Sciences, Changchun 130062, China;3.College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-01-01 Published:2011-01-01
  • Contact: JIN Ning-yi

摘要: 试验以L.plantarum1.557的基因组DNA为模板,通过PCR技术扩增α-半乳糖苷酶基因(melA)基因,PCR产物经纯化回收后克隆至pMD18-T载体中,转化E.coli DH5α感受态细胞,筛选阳性克隆,提取质粒进行SacⅠ和Sph Ⅰ酶切及PCR扩增鉴定,并对melA基因片段进行序列测定。结果表明,测得的melA基因序列全长2240 bp,含有酶切位点、启动子、SD序列及编码738个氨基酸的开放阅读框,理论分子质量为84 ku;4种核苷酸中GC含量为47.45%、AT含量为52.55%;序列中有3个碱基发生了变化,均为无义突变,未导致其推导的氨基酸的改变;序列测定结果与GenBank中登录的序列进行比较,核苷酸和氨基酸序列的同源性除与AY873840相比分别为96.6%和92.2%外,其余均大于99%。试验成功克隆了melA基因,为进一步构建重组表达载体奠定了基础。

关键词: 植物乳杆菌; α-半乳糖苷酶; 分子克隆; 序列分析

Abstract: Using chromosome DNA of L. plantarum as template,melA gene was amplified by PCR and purified by purification kit in this study. The PCR product of melA gene was cloned into pMD18-T vector and transformed into DH5α competent cells. The recombinant plasmid containing melA gene was selected and the inserted melA gene was identified by cleaved with restriction endonuclease Sac Ⅰ and Sph Ⅰ, and following by PCR amplification and sequencing. The cloned complete melA gene sequence, at a length of 2240 bp, encoded 738 amino acids with a deduced molecular weight of 84 ku. The GC and AT contents were 47.45% and 52.55% respectively. Three nucleotides nonsense mutation were observed, resulting no change of deduced amino acids. The homologies of nucleotides and amino acids were more than 99% respectively (except for AY873840, 96.6% and 92.2%) compared with those in GenBank. The results showed that the whole melA gene was cloned successfully. This research proved a foundation for the construction of recombinant express vector of melA gene.

Key words: L. plantarum; α-galactosidase; cloning; sequence analysis

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