Abstract
The production of nitric oxide and other reactive nitrogen intermediates (RNI) by macrophages helps to control infection by Mycobacterium tuberculosis ( Mtb ). However, the protection is imperfect and infection persists. To identify genes that Mtb requires to resist RNI, we screened 10,100 Mtb transposon mutants for hypersusceptibility to acidified nitrite. We found 12 mutants with insertions in seven genes representing six pathways, including the repair of DNA ( uvrB ) and the synthesis of a flavin cofactor ( fbiC ). Five mutants had insertions in proteasome-associated genes. An Mtb mutant deficient in a presumptive proteasomal adenosine triphosphatase was attenuated in mice, and exposure to proteasomal protease inhibitors markedly sensitized wild-type Mtb to RNI. Thus, the mycobacterial proteasome serves as a defense against oxidative or nitrosative stress.
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- We thank C. Sassetti and E. Rubin for providing the ϕMycoMarT7 transposon before its publication D. Ladant for the bacterial two-hybrid system D. Schappinger and D. Dou for polymerase chain reaction–screening the mutant library for prcBA mutants I. Orme for aerosol infection protocols H. T. Nguyen for histology M. Fuortes for calculations and photography and A. Darwin and A. Ding for review. Supported by NIH grants HL61241 AI055549 and T32 AI07621. The Department of Microbiology and Immunology acknowledges the support of the William Randolph Hearst Foundation. K.H.D. dedicates this work to the memory of Dr. Susan Valone.
Dates
Type | When |
---|---|
Created | 21 years, 8 months ago (Dec. 11, 2003, 5:48 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 9, 2024, 9:26 p.m.) |
Indexed | 2 weeks, 3 days ago (Aug. 12, 2025, 6:22 p.m.) |
Issued | 21 years, 8 months ago (Dec. 12, 2003) |
Published | 21 years, 8 months ago (Dec. 12, 2003) |
Published Print | 21 years, 8 months ago (Dec. 12, 2003) |
@article{Darwin_2003, title={The Proteasome of Mycobacterium tuberculosis Is Required for Resistance to Nitric Oxide}, volume={302}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1091176}, DOI={10.1126/science.1091176}, number={5652}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Darwin, K. Heran and Ehrt, Sabine and Gutierrez-Ramos, José-Carlos and Weich, Nadine and Nathan, Carl F.}, year={2003}, month=dec, pages={1963–1966} }