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Updated: Oct 29, 2025

Using Mycobacterium smegmatis as a Bioindicator for Zinc-Limited Growth Conditions in Mycobacteria
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Leptothrix cholodnii Response to Nutrient Limitation.

Tatsuki Kunoh1, Tatsuya Yamamoto1, Shinya Sugimoto2

  • 1Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan.

Frontiers in Microbiology
|July 12, 2021
PubMed
Summary
This summary is machine-generated.

Understanding nutrient needs for filamentous bacteria like Leptothrix cholodnii is key to preventing wastewater treatment bulking. Nutrient limitations, especially Ca2+, significantly alter filament structure and can be leveraged to control growth.

Keywords:
LeptothrixMicrofluidicsfilamentous bacteriumnutrient limitationsheath formation

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Area of Science:

  • Environmental microbiology
  • Wastewater treatment
  • Microbial ecophysiology

Background:

  • Filamentous bacteria are crucial in activated sludge wastewater treatment.
  • Uncontrolled growth causes bulking, reducing treatment efficiency.
  • Nutrient requirements for filament formation remain poorly understood.

Purpose of the Study:

  • To investigate the specific nutrient requirements for filamentous bacterium Leptothrix cholodnii SP-6 filament formation.
  • To elucidate how nutrient limitations impact cell-chain elongation and sheath formation.
  • To identify conditions that may control deleterious filamentous bacteria growth in water purification.

Main Methods:

  • Utilized a high aspect-ratio microfluidic chamber for precise control of nutrient conditions.
  • Tracked cell-chain elongation and sheath formation of L. cholodnii SP-6 under various nutrient limitations (Na+, K+, Fe2+, C, N, P, vitamins, Mg2+, Ca2+).
  • Observed morphological changes and cell viability in response to nutrient deprivation.

Main Results:

  • Limitations in Na+, K+, and Fe2+ showed no significant impact on filament morphology.
  • Depletion of C, N, P, or vitamins resulted in partially empty filaments with intercellular gaps.
  • Mg2+ deficiency induced cell autolysis; Ca2+ removal caused catastrophic filament disintegration, but simultaneous C and Ca2+ limitation promoted planktonic growth.

Conclusions:

  • Specific nutrient limitations, particularly Ca2+ and Mg2+, profoundly affect Leptothrix filament integrity and morphology.
  • Understanding these nutrient dependencies offers potential strategies to control filamentous bacteria bulking in wastewater systems.
  • Findings provide detailed insights into the ecophysiology of Leptothrix, aiding in optimizing water purification processes.