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A physical map of the chromosome of Lactococcus lactis subsp. lactis DL11 was constructed by using the contour-clamped homogeneous electric field mode of pulsed-field gel electrophoresis in one- and two-dimensional separations to analyze restriction digests of high-molecular-weight genomic DNA. The map, which shows all the observed NotI and SmaI sites (six and 21, respectively) and 8 of approximately 30 SalI sites, is circular and yields a total size of 2.58 megabase pairs for the L. lactis subsp. lactis DL11 chromosome. By using rDNA from Mycoplasma capricolum to probe Southern blots of pulsed-and fixed-field digestion patterns, six putative rRNA operons were identified in L. lactis subsp. lactis DL11 and placed on the map of the chromosome. Five of these loci are clustered in a region representing only 20% of the chromosome. The presence of a SmaI site in each of the putative operons allowed the direction of transcription of each operon to be deduced.

Physical map of the chromosome of Lactococcus lactis subsp. lactis DL11 and localization of six putative rRNA operons