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How much territory can a single E. coli cell control?

Ziad W El-Hajj1, Elaine B Newman1

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Summary
This summary is machine-generated.

This study explores exceptionally long Escherichia coli (E. coli) cells, some reaching 750 μm. Mutations in genes like metK and FtsZ, or the SOS response, cause this extreme elongation, challenging traditional bacterial size classifications.

Keywords:
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Area of Science:

  • Microbiology
  • Cell Biology
  • Genetics

Background:

  • Bacteria, traditionally known for small sizes like Escherichia coli (1-2 μm), exhibit size variation based on growth conditions.
  • Recent discoveries include giant bacteria such as Epulopiscium fishelsoni (700 μm) and Thiomargarita namibiensis (750 μm), necessitating complex intracellular organization.
  • This review focuses on elongated E. coli strains exceeding typical laboratory and natural dimensions.

Purpose of the Study:

  • To review E. coli cells that exhibit significant elongation beyond their standard size.
  • To highlight genetic and regulatory mechanisms contributing to bacterial cell elongation.
  • To present findings on exceptionally elongated E. coli strains, including a 750 μm mutant.

Main Methods:

  • Analysis of E. coli mutants with single-gene mutations (e.g., metK) affecting cell division and elongation.
  • Investigation of FtsZ mutants and their elongated phenotypes under specific temperature conditions (42°C).
  • Examination of the SOS response pathway's role in inducing cell elongation due to DNA damage.

Main Results:

  • metK mutants, when starved of S-adenosylmethionine, elongate up to 50 μm and beyond without dividing.
  • FtsZ mutants are routinely isolated as elongated cells when grown at 42°C.
  • A unique metK strain with an unidentified secondary mutation achieved a record length of 750 μm without internal divisions or increased width.

Conclusions:

  • Specific genetic mutations (metK, FtsZ) and cellular responses (SOS) can lead to extreme elongation in E. coli.
  • The study presents a 750 μm E. coli as a model for understanding extreme bacterial cell size.
  • These findings expand the known size range for E. coli and contribute to understanding bacterial morphology regulation.