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. 1986 May;166(2):439–445. doi: 10.1128/jb.166.2.439-445.1986

Role of ribosome degradation in the death of starved Escherichia coli cells.

B D Davis, S M Luger, P C Tai
PMCID: PMC214624  PMID: 2422153

Abstract

In Escherichia coli cultures limited for phosphate, the number of ribosomal particles was reduced to a small percentage of its earlier peak value by the time the viable cell count began to drop; the 30S subunits decreased more than the 50S subunits. Moreover, the ribosomal activity was reduced even more: these cells no longer synthesized protein, and their extracts could not translate phage RNA unless ribosomes were added. The translation initiation factors also disappeared, suggesting that they become less stable when released from their normal attachment to 30S subunits. In contrast, elongation factors, aminoacyl-tRNA synthetases, and tRNA persisted. During further incubation, until viability was reduced to 10(-5), the ribosomal particles disappeared altogether, while tRNA continued to be preserved. These results suggest that an excessive loss of ribosomes (and of initiation factors) may be a major cause of cell death during prolonged phosphate starvation.

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Selected References

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