Bacteria must constantly adapt their growth to changes in nutrient availability; yet despite large‐scale changes in protein expression associated with sensing, adaptation, and processing different environmental nutrients, simple growth laws connect the ribosome abundance and the growth rate. Here, we investigate the origin of these growth laws by analyzing the features of ribosomal regulation that coordinate proteome‐wide expression changes with cell growth in a variety of nutrient conditions in the model organism Escherichia coli. We identify supply‐driven feedforward activation of ribosomal protein synthesis as the key regulatory motif maximizing amino acid flux, and autonomously guiding a cell to achieve optimal growth in different environments. The growth laws emerge naturally from the robust regulatory strategy underlying growth rate control, irrespective of the details of the molecular implementation. The study highlights the interplay between phenomenological modeling and molecular mechanisms in uncovering fundamental operating constraints, with implications for endogenous and synthetic design of microorganisms.
Emergence of robust growth laws from optimal regulation of ribosome synthesis
M. Scott,S. Klumpp,E. Mateescu,T. Hwa
Published 2014 in Molecular Systems Biology
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- Publication year
2014
- Venue
Molecular Systems Biology
- Publication date
2014-08-01
- Fields of study
Biology, Medicine
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- External record
- Source metadata
Semantic Scholar, PubMed
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