Cited by 68Tuberculosis Research and EpidemiologyBacterial Genetics and BiotechnologyIron Metabolism and Disorders

Metal ion transport and regulation in mycobacterium tuberculosis

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Agranoff, Daniel·2004·Frontiers in Bioscience

Abstract

The regulation of metal ion concentrations is central to the physiology of the interaction between pathogenic bacteria and their hosts. Apart from the NRAMP orthologue, MntH, metal ion transporters in Mycobacterium tuberculosis have not been studied. Mn, the physiological substrate of MntH in other bacteria, may play an important role as a structural and redox-active cofactor in a wide range of metabolic processes. Fe, Cu and Zn play structural and catalytic roles in metalloenzymes involved in oxidative stress responses. Fe and Mg are required for growth in macrophages. Genomic analyses reveal 28 sequences encoding a broad repertoire of putative metal ion transporters (or transporter subunits), representing 24% of all transporters in this organism. These comprise 8 families of secondary active transporters and 3 families of primary active transporters, including 12,P, type ATPases. Potential metal ion specificities include K+, Na+, Cu2+, Cd2+, Zn2+, Mn2+, Mg2+, Ca2+, Co2+, Ni2+, Fe2+/3+, Hg2+, AsO2- and AsO4(2-). 17 of these transporters are also encoded as complete open reading frames in Mycobacterium leprae, suggesting a role in intracellular survival. Iron transcriptionally regulates a diverse set of genes via the iron-dependent DNA-binding proteins, Fur and IdeR. Changes in Fe and Mg concentrations signal entry into the intracellular compartment and potentially trigger up-regulation of virulence determinants. The plethora of putative transport systems encoded by the M. tuberculosis genome contrasts strikingly with the paucity of experimental data on these systems. The detailed analysis of the temporal pattern of M. tuberculosis transporter gene expression during infection will provide important insights into the basic biology of intracellular parasitism and may help to shape novel therapeutic strategies.

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  • Identification of two genes annotated as fecB and fecB2 coding proteins similar to E. coli FecB suggests M. tuberculosis may also utilize ferric dicitrate as an Fe source.

    “The identification of two genes that are annotated as fecB and fecB2 and that code proteins similar to FecB of Escherichia coli suggests that M. tuberculosis may also utilize ferric dicitrate as an Fe source [61].”

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Authors
Agranoff, D.
Affiliations
St George's Hospital (GB)
Corresponding author
Agranoff, Daniel
Venue
Frontiers in Bioscience
Publisher
IMR Press
Published
2004
Volume
9
Issue
1-3
Pages
2996
ISSN
  • 1093-4715 (ISSN-L)
  • 1093-9946
OpenAlex
W1999294120
Cited by
68
References
77
Citations by year
2025: 2 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 5 · 2020: 5 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 1 · 2014: 5 · 2013: 4 · 2012: 6
FWCI
0.31
Type
journal article
Language
en
Open access
Locations
  • Frontiers in bioscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust (063634)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
Keywords
Mycobacterium tuberculosis, metal ion transport, metal homeostasis, MntH, NRAMP, iron regulation, Fur protein, IdeR, copper transport, zinc transport, magnesium transport, manganese transport, arsenic transport, cadmium transport, mercury transport, secondary active transporters, Mycobacterium leprae, intracellular survival, virulence gene expression, macrophage infection, host-pathogen interaction
MeSH terms
Natural Resistance-associated Macrophage Protein 1, Adenosine Triphosphatases, Bacterial Proteins, Biological Transport, Ions, Iron, Magnesium, Metals, Mycobacterium tuberculosis, Virulence, Signal Transduction, Up-Regulation, Gene Expression Regulation, Bacterial, Genome, Ion Transport, Oxidative Stress, Cation Transport Proteins, Iron-Binding Proteins

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