Abstract
Mycobacterium tuberculosis H37Ra,M. smegmatisATCC 607,M. smegmatis MC2155,M. aurum A +,M. aurum A11, and one representative strain ofM. flavescens were transformed by electroporation with plasmid pMY10 and cosmid pDC100. Plasmid pMY 10 contained the origin of replication of pAL5000, the origin of replication of pBR322, a kanamycin resistance gene, and the origin of transfer of the Inc plasmid RK2; the cosmid pDC100 contained the pHC79 SS cosmid, the origin of replication of pAL5000, and a kanamycin resistance gene. The efficiency of transformation varied with the recipient cells used and was in decreasing order: 7×105 forM. smegmatis MC2155, 6×103 forM. tuberculosis H37Ra, 103 forM. aurum, 50 forM. smegmatis ATCC 607, and 5 forM. flavescens. A rapid protocol for plasmid extraction from mycobacteria was developed.
The satisfactory transformation of the nonvirulentM. tuberculosis strain H37Ra was of interest for future studies on cloning of virulence genes, while the satisfactory transformation ofM. aurum was of interest for future studies on the genetics of drug resistance because these bacteria are sensitive to drugs specifically used in the treatment of tuberculosis and leprosy. However, neither vector was stably maintained inM. smegmatis, indicating that further investigations are still necessary to resolve this difficulty.
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Lazraq, R., Clavel-Sérès, S. & David, H.L. Transformation of distinct mycobacterial species by shuttle vectors derived from theMycobacterium fortuitum pAL5000 plasmid. Current Microbiology 22, 9–13 (1991). https://doi.org/10.1007/BF02106206
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DOI: https://doi.org/10.1007/BF02106206