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.
journal_name
Biochimiejournal_title
Biochimieauthors
Bremer H,Dennis Pdoi
10.1016/j.biochi.2007.10.008subject
Has Abstractpub_date
2008-03-01 00:00:00pages
493-9issue
3eissn
0300-9084issn
1638-6183pii
S0300-9084(07)00302-1journal_volume
90pub_type
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