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J. Bacteriol., May 1995, 2840-2850, Vol 177, No. 10
P Le Bourgeois, M Lautier, L van den Berghe, MJ Gasson and P Ritzenthaler
A physical and genetic map of the chromosome of the Lactococcus lactis
subsp. cremoris reference strain MG1363 was established. The physical map
was constructed for NotI, ApaI, and SmaI enzymes by using a strategy that
combines creation of new rare restriction sites by the random-integration
vector pRL1 and ordering of restriction fragments by indirect end-labeling
experiments. The MG1363 chromosome appeared to be circular and 2,560 kb
long. Seventy-seven chromosomal markers were located on the physical map by
hybridization experiments. Integration via homologous recombination of
pRC1-derived plasmids allowed a more precise location of some lactococcal
genes and determination of their orientation on the chromosome. The MG1363
chromosome contains six rRNA operons; five are clustered within 15% of the
chromosome and transcribed in the same direction. Comparison of the L.
lactis subsp. cremoris MG1363 physical map with those of the two L. lactis
subsp. lactis strains IL1403 and DL11 revealed a high degree of restriction
polymorphism. At the genetic organization level, despite an overall
conservation of gene organization, strain MG1363 presents a large inversion
of half of the genome in the region containing the rRNA operons.
Copyright © 1995, American Society for Microbiology
Physical and genetic map of the Lactococcus lactis subsp. cremoris MG1363 chromosome: comparison with that of Lactococcus lactis subsp. lactis IL 1403 reveals a large genome inversion
Laboratoire de Microbiologie et Genetique Moleculaire, Institut de Biologie Cellulaire et de Genetique du Centre National de la Recherche Scientifique, Toulouse, France.
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