食品科学 ›› 2011, Vol. 32 ›› Issue (3 ): 121-125.doi: 10.7506/spkx1002-6630-201103029

• 生物工程 • 上一篇    下一篇

嗜热链球菌谷氨酸脱羧酶基因及其侧翼区序列分析

林谦 1,杨胜远2,陆兆新3 ,* ,吕凤霞3,别小妹3,邹晓葵3   

  1. 1.玉林师范学院化学生物系,广西玉林 537000; 2.韩山师范学院生物系,广东潮州 521041;
    3.南京农业大学食品科技学院,江苏南京 210095
  • 收稿日期:2010-06-04 修回日期:2010-12-31 出版日期:2011-02-15 发布日期:2011-01-13
  • 基金资助:

    广东省自然科学基金项目(8452104101001546);国家星火计划项目(2008GA780032);玉林师范学院高层次人才科研启动基金项目(G2009042)

Sequence Analysis of Glutamate Gecarboxylase Gene and Flanking Regions from Streptococcus thermophilus Y-2

LIN Qian,YANG Sheng-yuan,LU Zhao-xin,LU Feng-xia,BIE Xiao-mei,ZOU Xiao-kui   

  1. 1. Department of Chemistry and Biology, Yulin Normal University, Yulin 537000, China;
    2. Department of Biology, Hanshan Normal University, Chaozhou 521041, China;
    3. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2010-06-04 Revised:2010-12-31 Online:2011-02-15 Published:2011-01-13

摘要: 从嗜热链球菌Streptococcus thermophilus Y-2的谷氨酸脱羧酶基因(gadB)及其两侧旁邻序列出发,在GenBank中分别用Blastn、Blastx 搜索同源序列。gadB 在核酸水平上无法找到同源序列,在蛋白质水平上与多种细菌的谷氨酸脱羧酶同源。根据谷氨酸脱羧酶的氨基酸序列构建系统发育树,菌株Y-2 与具核梭杆菌Fusobacterium nucleatum subsp. polymorphum ATCC 10953 的亲缘关系最近。gadB 的上游侧翼区与嗜热链球菌LMG 18311 的插入序列IS1216转座酶基因具有很高的相似性。gadB 的下游侧翼区在核酸水平上未找到同源序列,在蛋白质水平上与谷氨酸/γ- 氨基丁酸转运蛋白有很高的相似性。菌株Y-2 的gadB、gadC 排列方式与大肠杆菌、弗氏志贺菌的相同,而与乳酸乳球菌、短小乳杆菌的相反。在已完成全基因组测序的3 个模式株Streptococcus thermophilus LMG 18311、CNRZ1066、LMD-9 中均含有插入序列 IS1216,但未发现谷氨酸脱羧酶基因gadB、谷氨酸/γ- 氨基丁酸转运蛋白基因gadC。

关键词: 序列分析, 嗜热链球菌, 谷氨酸脱羧酶, γ-氨基丁酸

Abstract: The glutamate decarboxylase gene (gadB) and its flanking regions from Streptococcus thermophilus Y-2 were investigated by homologous search in GenBank with Blastn and Blastx. There was no any other gene showing significant similarity with gadB, while the protein product of gadB had high similarity with several bacterial glutamate decarboxylases. Phylogenetic tree based on glutmamte decarboxylase sequences indicated that Fusobacterium nucleatum subsp. polymorphum ATCC 10593 showed the closest relationship with S. thermophilus Y-2. The upstream flanking region of gadB was homologous to bacterial transposases, while the downstream flanking region of gadB encoding a putative protein was similar to bacterial glutamate/γ-aminobutyric acid antiporters (GadC). The order of gadB and gadC in S. thermophilus Y-2 genome was similar to that of E. coli and Shigella flexneri, but different from that of Lactococcus lactis and Lactobacillus brevis. Insertion sequence IS1216 was present in genomes of S. thermophilus LMG 18311, CNRZ1066, and LMD-9, but not gadB or gadC.

Key words: Streptococcus thermophilus, glutamate decarboxylase, &gamma, -aminobutyric acid, sequence analysis

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