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Related Experiment Video

Updated: May 18, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Specific metal recognition in nickel trafficking.

Khadine A Higgins¹, Carolyn E Carr, Michael J Maroney

¹Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.

|September 14, 2012

Summary

Bacteria use sophisticated systems to manage essential nickel (Ni2+). This review details how nickel trafficking mechanisms distinguish Ni2+ from other metals, preventing toxicity and ensuring proper enzyme function.

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Area of Science:

Biochemistry
Microbiology
Molecular Biology

Background:

Nickel is an essential micronutrient for many bacteria, vital for the function of specific enzymes.
Bacterial nickel trafficking systems must selectively bind and transport nickel ions, distinguishing them from other transition metals.
The relatively simple nickel "traffic pattern" in bacteria offers a model for studying metal ion discrimination mechanisms.

Purpose of the Study:

To review the known mechanisms of nickel acquisition, delivery, and regulation in bacteria.
To explore how bacterial systems differentiate nickel from other metal ions with similar properties.
To highlight the molecular strategies employed in nickel homeostasis and metalloenzyme assembly.

Main Methods:

Review of existing literature on nickel transport proteins, metallochaperones, and metalloregulators.
Analysis of specific examples like NikA, HypA, NikR, and RcnR.
Examination of molecular recognition and allosteric regulation in nickel trafficking.

Main Results:

Bacterial nickel trafficking involves uptake permeases, metallochaperones, and proteins for metallocenter assembly.
Mechanisms for nickel discrimination include molecular recognition (e.g., NikA) and allosteric regulation (e.g., HypA, NikR, RcnR).
These systems ensure nickel is delivered to target enzymes while preventing cellular toxicity.

Conclusions:

Bacterial nickel homeostasis relies on intricate molecular mechanisms for metal ion selectivity and controlled delivery.
Understanding these nickel trafficking systems provides insights into broader principles of metal ion transport and regulation in biology.
The study of nickel transport in bacteria offers a valuable model for investigating metal ion discrimination and cellular metal management.