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. 1985 Mar;161(3):1093–1102. doi: 10.1128/jb.161.3.1093-1102.1985

Molecular analysis of DNA and construction of genomic libraries of Mycobacterium leprae.

J E Clark-Curtiss, W R Jacobs, M A Docherty, L R Ritchie, R Curtiss 3rd
PMCID: PMC215012  PMID: 3882664

Abstract

Molecular analysis of DNA from Mycobacterium leprae, "Mycobacterium lufu," and Mycobacterium vaccae has demonstrated that the G + C (guanine plus cytosine) contents of the DNAs are 56, 61, and 65%, respectively, and that the genome sizes are 2.2 X 10(9), 3.1 X 10(9), and 3.1 X 10(9) daltons, respectively. Because of the significant differences in both G + C content and genome size among M. leprae, "M. lufu," and M. vaccae DNAs, these species are not related, although hybridization experiments under nonstringent conditions, with two separate cloned M. leprae DNA inserts as probes, indicate that there are some conserved sequences among the DNAs. The G + C content of Dasypus novemcinctus (armadillo, the animal of choice for cultivating M. leprae) DNA was determined to be 36%. Genomic libraries potentially representing more than 99.99% of each genome were prepared by cloning into the cosmid vector, pHC79, in Escherichia coli K-12. A genomic library representing approximately 95% of the genome of M. vaccae was prepared in pBR322. M. leprae DNA was subcloned from the pHC79::M. leprae library into an expression vector, pYA626. This vector is a 3.8-kilobase derivative of pBR322 in which the promoter region of the asd (aspartate semialdehyde dehydrogenase) gene from Streptococcus mutans has been inserted in place of the EcoRI-to-PstI fragment of pBR322. Several (44% of those tested) pYA626::M. leprae recombinants and one pBR322::M. vaccae recombinant synthesized new polypeptides in minicells of E. coli, indicating that mycobacterial DNA can be expressed in E. coli K-12, although expression is probably dependent upon use of nonmycobacterial promoters recognized by the E. coli transcription-translation apparatus.

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Selected References

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