Abstract
This paper reports the production, purification, and biological assay of a new mycobactin fromMycobacterium paratuberculosis. This new mycobactin, designated mycobactin J, is produced by a strain ofM. paratuberculosis adapted to growth on synthetic medium without exogenous mycobactin. Mycobactin J reduces the incubation period ofM. paratuberculosis in complex medium by 3 weeks when compared with medium containing mycobactin P, and a higher proportion of the organisms, in inocula from infected tissues or fecal specimens, produce colonies. Also, some strains ofM. paratuberculosis will grow on medium containing mycobactin J that will not grow on medium containing mycobactin P.
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