氯代邻苯二酚1,2-双加氧酶基因的克隆及其定量表达 |
摘要点击 2736 全文点击 1508 投稿时间:2008-01-09 修订日期:2008-01-09 |
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中文关键词 铜绿假单胞菌 氯代邻苯二酚1,2-双加氧酶 1,2,4-三氯苯 实时荧光定量反转录-PCR |
英文关键词 Pseudomonas aeruginosa chlorocatechol 1,2-dioxygenase 1,2,4-trichlorobenzene real-time reverse transcription-PCR |
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中文摘要 |
从1,2,4-三氯苯降解菌铜绿假单胞菌(Pseudomonas aeruginosa)J5-2的总DNA中,利用PCR方法克隆到氯代邻苯二酚1,2-双加氧酶基因,命名为tcbC(J5-2) (GenBank登录号EF111021).分析tcbC(J5-2)基因的氨基酸序列后发现,该基因不同于已见报道的1,2,4-三氯苯降解菌Pseudomonas sp.P51中的氯代邻苯二酚1,2-双加氧酶基因tcbC(P51),与其同源性仅为95%.tcbC(J5-2)基因在48、 52和73这3个关键位置的氨基酸分别为Leu(亮氨酸)、Ala(丙氨酸)和Ile(异亮氨酸),而tcbC(P51)基因分别为Val(缬氨酸)、Ala(丙氨酸)和Met(蛋氨酸).利用实时荧光定量反转录-PCR(real-time reverse transcription-PCR)方法,考察了菌株J5-2在分别以1,2-二氯苯、 1,3-二氯苯和1,2,4-三氯苯为唯一碳源时tcbC(J5-2)基因的定量表达.结果表明, 1,2,4-三氯苯对tcbC基因的诱导作用更强. |
英文摘要 |
The chlorocatechol 1,2-dioxygenase gene,designated as tcbC(J5-2) (GenBank Accession No.EF111021),was cloned from total DNA of Pseudomonas aeruginosa J5-2 which can degrade 1,2,4-trichlorobenzene.The deduced amino acid sequence analysis of tcbC(J5-2) shows that it is different from tcbC(P51) cloned from another 1,2,4-trichlorobenzene-degrader Pseudomonas sp.P51.tcbC(J5-2) is only 95% similar to tcbC(P51) at the amino acid level.Three critical amino acid residues in tcbC (J5-1) are Leu-48,Ala-52,and Ile-73.Otherwise,they are Val-48,Ala-52,and Met-73 in tcbC (P51).mRNA accumulation of tcbC in J5-2 was quantified by real-time reverse transcription-PCR,when J5-2 grew on 1,2-dichlorobenzene, 1,3-dichlorobenzene and 1,2,4-trichlorobenzene respectively.The results show that 1,2,4-trichlorobenzen is a better inducer than 1,2- and 1,3-dichlorobenzene. |