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Related Experiment Video

Updated: Mar 22, 2026

Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers

Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers

Published on: June 24, 2019

Protein overabundance is driven by growth robustness.

H James Choi¹, Teresa W Lo¹, Kevin J Cutler¹

¹Department of Physics, University of Washington, Seattle, WA 98195, USA.

Science Advances

|March 20, 2026

Summary

Cells optimize fitness by maintaining essential protein levels. Most essential proteins are overabundant, ensuring robust growth by exceeding minimum requirements, a key mechanism for cellular survival.

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Last Updated: Mar 22, 2026

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High-throughput Screening for Protein-based Inheritance in S. cerevisiae

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Published on: August 8, 2017

Area of Science:

Molecular Biology
Microbiology
Systems Biology

Background:

Cellular fitness is influenced by essential protein expression levels, with deficiencies or excesses impacting growth.
A trade-off exists between insufficient protein levels (compromising function) and overexpression (increasing metabolic load).

Purpose of the Study:

To test the prediction that cells maximize fitness by expressing proteins at 'sufficiency' levels.
To analyze the fitness landscape concerning protein abundance in *Acinetobacter baylyi*.

Main Methods:

Characterizing proliferation dynamics of essential-gene knockouts at single-cell (imaging) and genome-wide scales.
Diluting target protein levels over multiple generations to assess fitness consequences.
Performing a proteome-scale analysis of the fitness landscape.

Main Results:

Most essential proteins exhibit a threshold-like fitness landscape; growth is maintained above a critical abundance threshold.
Approximately 70% of essential proteins are found to be overabundant.
Protein overabundance increases as expression levels decrease, with some proteins exceeding requirements by over 10-fold.

Conclusions:

Robustness is a critical factor in determining essential gene expression levels.
Overabundance of essential proteins is a primary mechanism for ensuring robust cellular growth and survival.