Emergence of Robust Growth Laws from Optimal Regulation of Ribosome Synthesis
Overview
Affiliations
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.
van Olst B, Boeren S, Vervoort J, Kleerebezem M mBio. 2025; 16(3):e0299024.
PMID: 39976430 PMC: 11898756. DOI: 10.1128/mbio.02990-24.
Antibiotics change the population growth rate heterogeneity and morphology of bacteria.
Kals M, Kals E, Kotar J, Donald A, Mancini L, Cicuta P PLoS Pathog. 2025; 21(2):e1012924.
PMID: 39908318 PMC: 11835381. DOI: 10.1371/journal.ppat.1012924.
Soft Modes as a Predictive Framework for Low Dimensional Biological Systems across Scales.
Russo C, Husain K, Murugan A ArXiv. 2025; .
PMID: 39764393 PMC: 11702803.
Single-cell data reveal heterogeneity of investment in ribosomes across a bacterial population.
Pavlou A, Cinquemani E, Pinel C, Giordano N, Mathilde V, Mihalcescu I Nat Commun. 2025; 16(1):285.
PMID: 39746998 PMC: 11695989. DOI: 10.1038/s41467-024-55394-5.
Genome concentration limits cell growth and modulates proteome composition in .
Makela J, Papagiannakis A, Lin W, Lanz M, Glenn S, Swaffer M Elife. 2024; 13.
PMID: 39714909 PMC: 11666246. DOI: 10.7554/eLife.97465.