PMID:17999920

Citation	Bremer, H and Dennis, P (2008) Feedback control of ribosome function in Escherichia coli. Biochimie 90:493-9
Abstract	We have previously proposed that the rate of ribosome function during balanced growth in E. coli, expressed as the rate of peptide chain elongation, is adjusted by a feedback mechanism: whenever that rate is submaximal (i.e. below 22 amino acid residues polymerized per active ribosome at 37 degrees C), the feedback signal ppGpp is generated by an activation of the ppGpp synthetase expressed from the spoT gene. The accumulation of ppGpp reduces the synthesis of additional ribosomes and thereby reduces the consumption of amino acids which, in turn, allows the remaining ribosomes to function at a higher rate. Here we have described with supporting evidence the proposed feedback loop in greater detail and provided a mathematical analysis which predicts that the SpoT ppGpp synthetase activity should be highest when the ribosomes function at their half-maximal rate. This prediction is consistent with reported observations and is independent of the particular (unknown) mechanism by which the rate of translation controls the ppGpp synthetase activity of SpoT.
Links	PubMed Online version:10.1016/j.biochi.2007.10.008
Keywords	Amino Acids/metabolism; Escherichia coli/enzymology; Escherichia coli/genetics; Escherichia coli/metabolism; Escherichia coli Proteins; Feedback, Physiological/physiology; Gene Expression Regulation, Bacterial; Guanine Nucleotides/metabolism; Ligases/metabolism; Pyrophosphatases/metabolism; Ribosomes/physiology
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