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research-article

Conserved gene arrangement in the origin region of the Streptomyces coelicolor chromosome.

Department of Biochemistry, University of Missouri-Columbia 65212.

ABSTRACT

A 23-kb fragment of the Streptomyces coelicolor chromosome spanning the dnaA region has been isolated as a cosmid clone. Nucleotide sequence analysis of a 5-kb portion shows that the genes for the RNase P protein (rnpA), ribosomal protein L34 (rpmH), the replication initiator protein (dnaA), and the beta subunit of DNA polymerase III (dnaN) are present in the highly conserved gene arrangement found in all eubacterial genomes studied so far. The dnaA-dnaN intergenic region is approximately 1 kb and contains a cluster of at least 12 DnaA boxes with a consensus sequence of TTGTCCACA matching the consensus DnaA box in the phylogenetically related Micrococcus luteus. Two DnaA boxes precede the dnaA sequence. We propose that the chromosomal origin (oriC) of S. coelicolor lies between dnaA and dnaN. In related work, J. Zakrzewska-Czerwinska and H. Schrempf (J. Bacteriol. 174:2688-2693, 1992) have identified the homologous sequence from the closely-related Streptomyces lividans as capable of self-replication.

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