Tubercle bacilli generate a novel cell wall-associated pigment after long-term anaerobic culture

Many cases of tuberculosis result from reactivation of previously acquired latent infections. Models to study such persister forms often involve gradual depletion of oxygen during culture as poor aeration is a characteristic of non-progressive TB granulomas. Anaerobically cultured bacilli develop a...

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Bibliographic Details
Published in:FEMS microbiology letters 2004-06, Vol.235 (1), p.191-198
Main Authors: Cunningham, A F, Ashton, PR, Spreadbury, CL, Lammas, DA, Craddock, R, Wharton, C W, Wheeler, PR
Format: Article
Language:English
Subjects:
Mycobacterium bovis
Mycobacterium tuberculosis
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Summary:Many cases of tuberculosis result from reactivation of previously acquired latent infections. Models to study such persister forms often involve gradual depletion of oxygen during culture as poor aeration is a characteristic of non-progressive TB granulomas. Anaerobically cultured bacilli develop a thickened outer-most cell wall layer. Here, we analyzed this layer from anaerobically cultured Mycobacterium tuberculosis and Mycobacterium bovis BCG. By six weeks of anaerobiosis a pigment was detected at levels >60-fold higher in anaerobic than aerobic bacilli. This pigment was responsible for the electron-dense appearance of the thickened cell wall layer and gave an electrospray mass spectrometry peak at 409 Da (M+Na) super(+) or (M+H) super(+). We termed this pigment APP1, anaerobically produced pigment 1, the first pigment identified in M. tuberculosis.
ISSN:0378-1097
DOI:10.1016/j.femsle.2004.04.036