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Area of Science:

  • Molecular Biology
  • Systems Biology
  • Biophysics

Background:

  • Ribosome quantities are historically linked to cellular growth rates.
  • However, mRNA and RNA polymerase levels also significantly impact growth in physiological conditions.
  • Previous models often focused on single factors, neglecting complex interactions.

Purpose of the Study:

  • To develop a quantitative model of cellular biosynthesis.
  • To explore the interplay between RNA polymerases, ribosomes, mRNA, and growth rate.
  • To provide testable scenarios for experimentally observed phenomena.

Main Methods:

  • Construction of a quantitative biosynthesis model.
  • Theoretical analysis of a regime where RNA polymerases and ribosomes compete for resources.
  • Derivation of general expressions relating growth rate to molecular concentrations.

Main Results:

  • The model predicts how ribosome fraction depends on total mRNA concentration.
  • It identifies an underexplored regime where transcript and ribosome levels jointly determine growth rate.
  • The model clarifies experimental observations in yeast and E. coli regarding protein expression costs, mRNA trends, and ribosome allocation.

Conclusions:

  • A regime of joint limitation, where mRNA and ribosome levels co-determine growth, likely applies under physiological conditions.
  • This joint limitation may be a self-imposed regulatory strategy.
  • The model offers a framework for understanding resource allocation and growth dynamics in cells.