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. 1995 Nov;177(22):6527–6535. doi: 10.1128/jb.177.22.6527-6535.1995

Mycobacterium smegmatis dnaA region and autonomous replication activity.

M Rajagopalan 1, M H Qin 1, D R Nash 1, M V Madiraju 1
PMCID: PMC177505  PMID: 7592430

Abstract

Two key elements that are thought to be required for replication initiation in eubacteria are the DnaA protein, a trans-acting factor, and the replication origin, a cis-acting element. As a first step in studying the replication initiation process in mycobacteria, we have isolated a 4-kb chromosomal DNA fragment from Mycobacterium smegmatis that contains the dnaA gene. Nucleotide sequence analysis of this region revealed homologies with the rpmH gene, which codes for the ribosomal protein L34, the dnaA gene, which codes for the replication initiator protein DnaA, and the 5' end of the dnaN gene, which codes for the beta subunit of DNA polymerase III. Further, we provide evidence that when cloned into pUC18, a plasmid that is nonreplicative in M. smegmatis, the DNA fragment containing the dnaA gene and its flanking regions rendered the former capable of autonomous replication in M. smegmatis. We suggest that the M. smegmatis chromosomal origin of replication is located within the 4-kb DNA fragment.

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Selected References

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