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Comparative analysis of iron regulated genes in mycobacteria
Sailu Yellaboina1, Sarita Ranjan, Vaibhav Vindal
1Computational and Functional Genomics Group, Sun Centre of Excellence in Medical Bioinformatics, Centre for DNA Fingerprinting and Diagnostics, EMBnet India Node, Hyderabad 500076, India.
FEBS Letters
|April 25, 2006
Summary
This study identifies conserved and unique iron-regulated genes across mycobacteria using computational methods. It reveals novel conserved genes and species-specific iron regulation patterns, enhancing our understanding of mycobacterial iron metabolism.
Area of Science:
- Microbiology
- Genomics
- Biochemistry
Background:
- The iron-dependent regulator (IdeR) controls gene expression based on intracellular iron levels in Mycobacterium tuberculosis.
- IdeR orthologs are found across all sequenced mycobacterial species, suggesting a conserved regulatory mechanism.
Purpose of the Study:
- To computationally identify genes regulated by IdeR that are conserved across mycobacteria.
- To identify genes with species-specific iron regulation within the Mycobacterium genus.
Main Methods:
- Comparative genomics analysis of IdeR-regulated genes across various mycobacterial species.
- Bioinformatic identification of conserved and unique gene sets.
Main Results:
- Identified novel conserved iron-regulated genes, including a 4-hydroxy benzoyl CoA hydrolase (Rv1847) and a protease-dependent antibiotic regulatory system (Rv1846c, Rv0185c).
- Mycobacterium natural-resistance-associated macrophage protein (Mramp) is iron-regulated only in M. avium subsp. paratuberculosis, despite its presence in all species.
- An exochelin biosynthetic operon was identified as iron-regulated exclusively in the non-pathogenic Mycobacterium smegmatis.
Conclusions:
- The study highlights conserved and divergent iron regulatory strategies within the Mycobacterium genus.
- Identified novel iron-responsive genes and pathways, providing insights into mycobacterial adaptation and virulence.