Construction and application of mycobacterial reporter transposons.

Construction and application of mycobacterial reporter transposons.
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分枝杆菌报告转座子的构建及应用。

DOI:
10.1016/s0378-1119(00)00238-9
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发表时间:
2000
期刊:
影响因子:
3.5
通讯作者:
Mizrahi,V
Mizrahi,V
中科院分区:
生物学3区
文献类型:
--
作者:
Machowski,EE;McAdam,RA;Derbyshire,KM;Mizrahi,V

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转座子Tn5367是分枝杆菌插入序列IS 1096的衍生物,通过引入新基因来修饰以产生报告转座子,其可用于产生含有分枝杆菌基因或操纵子融合体的转座子插入文库。使用对分枝杆菌中的复制温度敏感的质粒将无启动子的lacZ或aph报告基因作为转录(lacZ)或翻译(aphh)融合物递送至耻垢分枝杆菌。含有lacZ的突变体在指示剂培养基上产生不同强度的蓝色。该报道活性可用作启动子强度的定量量度。通过将缺少启动子、核糖体结合位点和起始密码子以形成功能活性翻译融合物的ARAPH报告基因进行转座插入,获得了对卡那霉素显示不同水平抗性的突变体。最后,在Tn5367中包含R6Kγ起点允许在允许该起点复制的大肠杆菌宿主菌株中拯救转座子插入。这项研究表明,Tn5367的转录和翻译报告衍生物是功能性的,它们补充了越来越多的分子工具可用于分枝杆菌的研究。
The transposon Tn5367, which is a derivative of the mycobacterial insertion sequence IS1096, was modified by introducing novel genes to produce reporter transposons which can be used to generate transposon insertion libraries containing mycobacterial gene or operon fusions. A plasmid that is temperature-sensitive for replication in mycobacteria was used to deliver promoterless lacZ or aph reporter genes to Mycobacterium smegmatis as transcriptional (lacZ), or translational (‵aph) fusions. Mutants containing lacZ produced varying intensities of blue colour on indicator media. This reporter activity could be used as a quantitative measure of promoter strength. Mutants displaying varying levels of resistance to kanamycin were obtained by transpositional insertion of the ‵aph reporter lacking a promoter, ribosome binding site and start codon to form functionally active translational fusions. Finally, inclusion of the R6Kγ origin within Tn5367 allowed transposon insertions to be rescued in an Escherichia coli host strain permissive for the replication of this origin. This study demonstrates that transcriptional and translational reporter derivatives of Tn5367 are functional, and they supplement the growing range of molecular tools available for the study of mycobacteria.
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