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Volume 148, Issue 10

Oxidative stress response genes in : role of in resistance to peroxynitrite and stage-specific survival in macrophages Free

Abstract

The gene, encoding the mycobacterial orthologue of alkylhydroperoxide reductase, undergoes an unusual regulatory cycle. The levels of AhpC alternate between stages of expression silencing in virulent strains grown as aerated cultures, secondary to a natural loss of the regulatory function in all strains of the tubercle bacillus, and expression activation in static bacilli by a yet undefined mechanism. The reasons for this unorthodox regulatory cycle controlling expression of an antioxidant factor are currently not known. In this work, H37Rv and mc155 knockout mutants were tested for sensitivity to reactive nitrogen intermediates, in particular peroxynitrite, a highly reactive combinatorial product of reactive nitrogen and oxygen species, and sensitivity to bactericidal mechanisms in resting and activated macrophages. Both ::Km and ::Km showed increased susceptibility to peroxynitrite. In contrast, inactivation of in did not cause increased sensitivity to donors of NO alone. ::Km also showed decreased survival in unstimulated macrophages, but the effect was no longer detectable upon IFNγ activation. These studies establish a specific role for in antioxidant defences involving peroxynitrite and most likely additional cidal mechanisms in macrophages, with the regulatory cycle likely contributing to survival upon coming out of the stationary phase during dormancy (latent infection) or upon transmission to a new host.

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Keyword(s): ahpC , DETA nonoate, (Z)-1-[N-(2-aminoethyl)-N-(2-ammonioethyl)aminio]diazen-1-ium-1,2-diolate) , latency , M. tuberculosis , nitric oxide and peroxynitrite
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2002-10-01
2025-05-19
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/content/journal/micro/10.1099/00221287-148-10-3139
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Oxidative stress response genes in Mycobacterium tuberculosis: role of ahpC in resistance to peroxynitrite and stage-specific survival in macrophages
Microbiology 148, 3139 (2002); https://doi.org/10.1099/00221287-148-10-3139
/content/journal/micro/10.1099/00221287-148-10-3139
/content/journal/micro/10.1099/00221287-148-10-3139
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