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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
08:46

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Published on: January 6, 2015

Physiological response to membrane protein overexpression in E. coli.

Francesca Gubellini1, Grégory Verdon, Nathan K Karpowich

  • 1Department of Biological Sciences, 702A Fairchild Center, MC2434, Columbia University, New York, New York 10027, USA.

Molecular & Cellular Proteomics : MCP
|July 2, 2011
PubMed
Summary

Overexpressing integral membrane proteins (IMPs) in E. coli is challenging due to toxicity and misfolding. However, this study finds that protein properties, not host physiology, are the main hurdles for IMP overexpression in E. coli.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Integral membrane protein (IMP) overexpression is crucial for structural and functional studies.
  • Escherichia coli (E. coli) is a common host, but IMPs often cause toxicity and low yields of folded protein.
  • Limited understanding exists regarding the physiological constraints on IMP overexpression in vivo.

Purpose of the Study:

  • To characterize the physiological responses of E. coli to IMP and soluble protein overexpression.
  • To identify the key factors limiting successful IMP overexpression and folding in E. coli.

Main Methods:

  • Utilized genetic, genomic, and microscopy techniques.
  • Analyzed physiological responses of E. coli MG1655 to overexpression of various proteins.
  • Investigated transcriptomic and genetic marker data.

Main Results:

  • Overexpression of IMPs and soluble proteins minimally perturbs E. coli physiology.
  • IMP overexpression moderately impacts the stationary-phase transcriptional program more than soluble proteins.
  • Protein biochemical and conformational properties are identified as primary obstacles to IMP overexpression success.

Conclusions:

  • E. coli can support moderate-level IMP overexpression suitable for structural studies.
  • Inherent physiological obstacles in E. coli for IMP overexpression are less significant than previously thought.
  • Target protein toxicity drives selective pressures, potentially leading to heterogeneity and crystallization challenges.