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Infect. Immun., 03 1995, 1004-1012, Vol 63, No. 3
Copyright © 1995, American Society for Microbiology

In vivo growth characteristics of leucine and methionine auxotrophic mutants of Mycobacterium bovis BCG generated by transposon mutagenesis

RA McAdam, TR Weisbrod, J Martin, JD Scuderi, AM Brown, JD Cirillo, BR Bloom and WR Jacobs Jr
Howard Hughes Medical Institute, Department of Microbiology and Immunology, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461.

Insertional mutagenesis in Mycobacterium bovis BCG, a member of the slow-growing M. tuberculosis complex, was accomplished with transposons engineered from the Mycobacterium smegmatis insertion element IS1096. Transposons were created by placing a kanamycin resistance gene in several different positions in IS1096, and the resulting transposons were electroporated into BCG on nonreplicating plasmids. These analyses demonstrated that only one of the two open reading frames was necessary for transposition. A library of insertions was generated. Southern analysis of 23 kanamycin-resistant clones revealed that the transposons had inserted directly, with no evidence of cointegrate formation, into different restriction fragments in each clone. Sequence analysis of nine of the clones revealed junctional direct 8-bp repeats with only a slight similarity in target sites. These results suggest that IS1096- derived transposons transposed into the BCG genome in a relatively random fashion. Three auxotrophs, two for leucine and one for methionine, were isolated from the library of transposon insertions in BCG. They were characterized by sequencing and found to be homologous to the leuD gene of Escherichia coli and a sulfate-binding protein of cyanobacteria, respectively. When inoculated intravenously into C57BL/6 mice, the leucine auxotrophs, in contrast to the parent BCG strain or the methionine auxotroph, showed an inability to grow in vivo and were cleared within 7 weeks from the lungs and spleen.

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