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Related Experiment Video

Updated: Jun 22, 2026

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
06:37

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source

Published on: February 7, 2013

The heme sensor system of Staphylococcus aureus.

Devin L Stauff, Eric P Skaar

    Contributions to Microbiology
    |June 5, 2009
    PubMed
    Summary

    Staphylococcus aureus senses toxic heme levels using the HssRS system, which activates HrtAB to reduce toxicity. This heme sensing and detoxification is crucial for staphylococcal virulence.

    Area of Science:

    • Microbiology
    • Bacterial Pathogenesis
    • Molecular Biology

    Background:

    • Staphylococcus aureus, a significant human pathogen, acquires iron from host hemoglobin during infection.
    • Heme acquisition, while necessary for iron, can lead to toxic levels for S. aureus.
    • Effective management of heme toxicity is essential for bacterial survival and virulence.

    Purpose of the Study:

    • To investigate the mechanism by which Staphylococcus aureus detects and responds to toxic levels of exogenous heme.
    • To elucidate the role of the HssRS two-component system and the HrtAB transporter in heme detoxification.
    • To understand the impact of heme sensing and detoxification on S. aureus virulence.

    Main Methods:

    • The study focuses on the HssRS heme sensing system and the HrtAB heme-regulated ABC transporter in S. aureus.

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  • Analysis of gene regulation in response to heme exposure.
  • Assessment of bacterial virulence in relation to heme sensing and detoxification capabilities.

    • Main Results:

    • S. aureus utilizes the HssRS two-component system to sense toxic heme levels.
    • HssRS directly regulates the expression of the HrtAB transporter to alleviate heme toxicity.
    • Impaired heme sensing or detoxification significantly alters S. aureus virulence.
    • Homologues of Hss and Hrt systems are present in other Gram-positive bacteria, suggesting a conserved response to heme stress.

    Conclusions:

    • Heme sensing and detoxification via the HssRS-HrtAB pathway are critical for Staphylococcus aureus pathogenesis.
    • This mechanism is vital for managing the dual role of heme as a nutrient and a toxin.
    • The findings suggest that heme stress is a common challenge for bacteria inhabiting heme-rich host environments.