Average number of rRNA genes per cell

Range 12.4-35.9 Table - link unitless
Organism Bacteria Escherichia coli
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 97 p.9/26 Table 3
Method Note 'q' beneath table:"The number of rRNA genes per cell was calculated from the number of rrn genes per genome (this table) and the number of genomes per cell (table 2 link ):Nrrn=(Nrrn/G)×Gc" G=genome Gc=Genome equivalent per cell. Observed parameters are 'C'=Time to replicate the chromosome, 'D'=Time between termination of replication and division.
Comments p.12/26 bottom paragraph:"Ribosomal gene dosage and gene activity: There are seven rrn genes on the E. coli chromosome: most of them map near the chromosomal origin of replication (ref 4). The actual number of rrn genes per (average) cell is much greater than 7, ranging from 12 to 36, depending on the extent of chromosome branching (see Fig. 1)." Values at different half-lives and doubling times. Stable RNA=rRNA, tRNA and their spacers.
Entered by Uri M
ID 102359