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Cited by 342

The DOI matches its Crossref record; 44 of the 44 references it cites were found in a registry or an index.

Role of KatG catalase‐peroxidase in mycobacterial pathogenesis: countering the phagocyte oxidative burst

Open access
Ng, Vincent H., Cox, Jeffery S., Sousa, Alexandra O., MacMicking, John D., McKinney, John D.·2004·Molecular Microbiology

Abstract

Summary: Reactive nitrogen species (RNS) play an essential role in host defence against Mycobacterium tuberculosis (MTB) in the mouse model of tuberculosis (TB), as evidenced by the increased susceptibility of mice deficient in the inducible isoform of nitric oxide synthase (NOS2). In contrast, the role of reactive oxygen species (ROS) in protection against MTB is less clear, and mice defective in the ROS‐generating phagocyte NADPH oxidase (Phox) are relatively resistant. This suggests that MTB might possess efficient mechanisms to evade or counter the phagocyte oxidative burst, effectively masking the impact of this host defence mechanism. In order to assess the role of ROS detoxification pathways in MTB virulence, we generated a katG null mutant of MTB, deficient in the KatG catalase‐peroxidase‐peroxynitritase, and evaluated the mutant's ability to replicate and persist in macrophages and mice. Although markedly attenuated in wild‐type C57Bl/6 mice and NOS2–/– mice, the Δ katG MTB strain was indistinguishable from wild‐type MTB in its ability to replicate and persist in gp91 Phox–/– mice lacking the gp91 subunit of NADPH oxidase. Similar observations were made with murine bone marrow macrophages infected ex vivo: growth of the Δ katG MTB strain was impaired in macrophages from C57Bl/6 and NOS2–/– mice, but indistinguishable from wild‐type MTB in gp91 Phox–/– macrophages. These results indicate that the major role of KatG in MTB pathogenesis is to catabolize the peroxides generated by the phagocyte NADPH oxidase; in the absence of this host antimicrobial mechanism, KatG is apparently dispensable.

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Metadata

Authors
Ng, V. H., Cox, J. S., Sousa, A. O., MacMicking, J. D., & McKinney, J. D.
Venue
Molecular Microbiology
Publisher
Wiley
Published
2004-04-30
Volume
52
Issue
5
Pages
1291-1302
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W2103512536
Cited by
342
References
44
FWCI
8.05
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Role of KatG catalase‐peroxidase in mycobacterial pathogenesis: countering the phagocyte oxidative burst. https://app.cochat.ai/papers/10.1111/j.1365-2958.2004.04078.x
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Ng, V. H., Cox, J. S., Sousa, A. O., MacMicking, J. D., & McKinney, J. D. (2004). Role of KatG catalase‐peroxidase in mycobacterial pathogenesis: countering the phagocyte oxidative burst. Molecular Microbiology. https://doi.org/10.1111/j.1365-2958.2004.04078.x

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