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Updated: Jul 12, 2025

Genome-wide Quantification of Translation in Budding Yeast by Ribosome Profiling
Published on: December 21, 2017
Ribosome Abundance Control in Prokaryotes
Jacob Shea1, Lisa Davis1, Bright Quaye2
1Department of Mathematical Sciences, Montana State University, Bozeman, MT, 59717, USA.
Abstract:
Cell growth is an essential phenotype of any unicellular organism and it crucially depends on precise control of protein synthesis. We construct a model of the feedback mechanisms that regulate abundance of ribosomes in E. coli, a prototypical prokaryotic organism. Since ribosomes are needed to produce more ribosomes, the model includes a positive feedback loop central to the control of cell growth. Our analysis of the model shows that there can be only two coexisting equilibrium states across all 23 parameters. This precludes the existence of hysteresis, suggesting that the ribosome abundance changes continuously with parameters. These states are related by a transcritical bifurcation, and we provide an analytic formula for parameters that admit either state.
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