Number of rrn operons

Value 7 operons
Organism Bacteria Salmonella typhimurium
Reference Bremer, H., Dennis, P. P. (1996) Modulation of chemical composition and other parameters of the cell by growth rate. Neidhardt, et al. eds. Escherichia coli and Salmonella typhimurium: Cellular and Molecular Biology, 2nd ed. chapter 112, Repeated Sequences, p.5 bottom paragraph
Primary Source Lehner AF, Harvey S, Hill CW. Mapping and spacer identification of rRNA operons of Salmonella typhimurium. J Bacteriol. 1984 Nov160(2):682-6.PubMed ID6094483
Comments "The fact that both E. coli and S. typhimurium have seven rrn operons (primary source) indicates that the arrangement is both ancient and selectively maintained. The advantage of seven could simply be one of gene dosage. Alternatively, the operons might encode rRNA molecules with (slightly) different functions, or they might be affected differently by changes in growth conditions."
Entered by Uri M
ID 107867