RRC ID 35623
Author Tamura M, Moore CJ, Cohen SN.
Title Nutrient dependence of RNase E essentiality in Escherichia coli.
Journal J Bacteriol
Abstract Escherichia coli cells normally require RNase E activity to form colonies (colony-forming ability [CFA]). The CFA-defective phenotype of cells lacking RNase E is partly reversed by overexpression of the related endoribonuclease RNase G or by mutation of the gene encoding the RNA helicase DeaD. We found that the carbon source utilization by rne deaD doubly mutant bacteria differs from that of rne(+) cells and from that of cells mutated in deaD alone and that the loss of rne function in these bacteria limits conversion of the glycolytic pathway product phosphoenolpyruvate to the tricarboxylic acid (TCA) cycle intermediate oxaloacetic acid. We show that the mechanism underlying this effect is reduced production of the enzyme phosphoenolpyruvate carboxylase (PPC) and that adventitious overexpression of PPC, which facilitates phosphoenolpyruvate utilization and connects the glycolytic pathway with the TCA cycle, restored CFA to rne deaD mutant bacteria cultured on carbon sources that otherwise were unable to sustain growth. We further show that bacteria producing full-length RNase E, which allows formation of degradosomes, have nutritional requirements different from those of cells supplied with only the N-terminal catalytic region of RNase E and that mitigation of RNase E deficiency by overexpression of a related RNase, RNase G, is also affected by carbon source. Our results reveal previously unsuspected effects of RNase E deficiency and degradosome formation on nutrient utilization by E. coli cells.
Volume 195(6)
Pages 1133-41
Published 2013-3-1
DOI 10.1128/JB.01558-12
PII JB.01558-12
PMID 23275245
PMC PMC3591997
MeSH Carbon / metabolism Citric Acid Cycle / genetics Endoribonucleases / genetics Endoribonucleases / metabolism* Escherichia coli / enzymology* Escherichia coli / genetics* Escherichia coli / metabolism Escherichia coli Proteins / metabolism* Glycolysis / genetics Humans Oxaloacetic Acid / metabolism Phosphoenolpyruvate / metabolism Phosphoenolpyruvate Carboxylase / metabolism RNA Helicases / genetics RNA Helicases / metabolism*
IF 3.006
Times Cited 12
Prokaryotes E. coli JW3928-1( Keio )?