Abstract
Photoinduced carotenoid synthesis has been studied in two species of mycobacteria, Mycobacterium marinum and an unclassified species. The action spectra of photo-induction have been shown to be markedly different for these two organisms. The action spectrum for the Mycobacterium sp. has maxima at 365 and 460 mμ separated by a minimum at 395 mμ. The action spectrum of M. marinum has a principal maximum at 404 mμ and two lesser maxima at 493 and 577 mμ. It is likely that a flavin is the photoreceptor for the Mycobacterium sp. and a porphyrin for M. marinum. The photoinduction of carotenogenesis in Mycobacterium sp. was found to be depressed at acid pH while that of M. marinum was unaffected by that treatment. The photoinductive reaction of both organisms was inhibited by azide at acid pH.
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