RIBOSOMAL-RNA OPERON MULTIPLICITY IN ESCHERICHIA-COLI AND THE PHYSIOLOGICAL IMPLICATIONS OF RRN INACTIVATION

Here we present evidence that only five of the seven rRNA operons present in Escherichia coli are necessary to support near-optimal growth on complex media, Seven rm operons are necessary, however, for rapid adaptation to nutrient and temperature changes, suggesting it is the ability to adapt quickly to changing environmental conditions that has provided the selective pressure for the persistence of seven rm operons in E. coli, We have also found that one consequence of mt operon inactivation is a miscoordination of the concentrations of initiation factor IF3 and ribsomes.