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Microbial metal physiology: ions to ecosystems.

John D Helmann1

  • 1Department of Microbiology, Cornell University, Ithaca, NY, USA. jdh9@cornell.edu.

Nature Reviews. Microbiology
|July 27, 2025
PubMed
Summary

Microorganisms must manage metal ion levels for survival, facing challenges from both scarcity and toxicity in diverse environments. Understanding microbial metal physiology offers solutions for ecosystem health, bioremediation, and pathogen control.

Area of Science:

  • Microbial Physiology
  • Environmental Microbiology
  • Biochemistry

Background:

  • Metal ions are essential for life, but their concentrations vary greatly across environments, leading to limitations or toxicities for microorganisms.
  • Microbial fitness is influenced by metal availability, impacting both commensal and pathogenic species within the human host and external ecosystems.
  • Metal homeostasis is crucial, requiring efficient import during deficiency and export during excess to prevent cellular damage.

Purpose of the Study:

  • To review the key processes of metal transport, trafficking, storage, and regulation in microorganisms.
  • To highlight how microorganisms adapt to survive in environments with varying metal concentrations, from limited to toxic levels.
  • To explore the potential applications of microbial metal physiology in ecosystem management, bioremediation, biomining, and combating bacterial pathogens.

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Main Methods:

  • Review of existing literature on microbial metal ion homeostasis.
  • Analysis of metalloregulatory systems and their associated regulons.
  • Case studies of microorganisms thriving in metal-limited or metal-toxic environments.

Main Results:

  • Metalloregulatory systems are central to microbial adaptation to metal availability fluctuations.
  • Analysis of these systems reveals critical transport, trafficking, and storage functions.
  • Insights into intracellular metal pools and processes affected by metal imbalance were gained.

Conclusions:

  • A comprehensive understanding of microbial metal physiology is essential for addressing environmental and health challenges.
  • Harnessing this knowledge can lead to improvements in ecosystem health, bioremediation strategies, and biomining applications.
  • Targeting microbial metal metabolism offers a route to control pathogenic bacterial growth.