Journal
INFECTION AND IMMUNITY
Volume 83, Issue 2, Pages 544-550Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/IAI.02722-14
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Funding
- National Research Foundation
- South African Medical Research Council
- Howard Hughes Medical Institute
- Columbia University-Southern African Fogarty AITRP
- PHRI-AURUM-Global Infectious Diseases Research Programme
- NIAID [AI54338, AI092002]
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Mycobacterium tuberculosis is able to synthesize molybdopterin cofactor (MoCo), which is utilized by numerous enzymes that catalyze redox reactions in carbon, nitrogen, and sulfur metabolism. In bacteria, MoCo is further modified through the activity of a guanylyltransferase, MobA, which converts MoCo to bis-molybdopterin guanine dinucleotide (bis-MGD), a form of the cofactor that is required by the dimethylsulfoxide (DMSO) reductase family of enzymes, which includes the nitrate reductase NarGHI. In this study, the functionality of the mobA homolog in M. tuberculosis was confirmed by demonstrating the loss of assimilatory and respiratory nitrate reductase activity in a mobA deletion mutant. This mutant displayed no survival defects in human monocytes or mouse lungs but failed to persist in the lungs of guinea pigs. These results implicate one or more bis-MGD-dependent enzymes in the persistence of M. tuberculosis in guinea pig lungs and underscore the applicability of this animal model for assessing the role of molybdoenzymes in this pathogen.
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