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Bacterial Longevity Requires Protein Synthesis and a Stringent Response.

Liang Yin1, Hongyu Ma1,2, Ernesto S Nakayasu3

  • 1Department of Microbiology, University of Washington, Seattle, Washington, USA.

Mbio
|October 17, 2019
PubMed
Summary
This summary is machine-generated.

Long-lived bacteria, like Rhodopseudomonas palustris, remain viable during growth arrest by actively synthesizing proteins and mounting a stringent response. This challenges the idea that non-growing bacteria are dormant and metabolically inactive.

Keywords:
Rhodopseudomonas palustrisgrowth arrestlongevityribosomesstringent responsetranslation

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Molecular Biology

Background:

  • Gram-negative bacteria often enter a non-growing state due to environmental stresses, which can lead to antibiotic tolerance.
  • This non-growing state has been traditionally viewed as dormancy, implying metabolic inactivity.

Purpose of the Study:

  • To investigate the mechanisms underlying the long-term viability of growth-arrested bacteria.
  • To determine if protein synthesis and stringent response are crucial for bacterial longevity during growth arrest.

Main Methods:

  • Studied Rhodopseudomonas palustris, a phototrophic alphaproteobacterium known for its extended viability during growth arrest.
  • Analyzed protein synthesis, translation machinery, and stringent response pathways in growth-arrested cells.

Main Results:

  • Protein synthesis and specific translation proteins are essential for the prolonged survival of growth-arrested R. palustris.
  • A stringent response is also required for bacterial longevity during growth arrest.
  • Growth-arrested R. palustris cells exhibit significant metabolic activity, contrary to the dormancy assumption.

Conclusions:

  • Bacterial longevity during growth arrest is an active process requiring sustained protein synthesis and stringent response.
  • This challenges the traditional view of dormant bacteria as metabolically inactive, suggesting higher metabolic activity than previously assumed.
  • Rhodopseudomonas palustris serves as an excellent model for studying bacterial longevity and the active strategies employed by non-growing cells.