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. 1970 Oct;104(1):300–312. doi: 10.1128/jb.104.1.300-312.1970

Mutant Analysis and Enzyme Subunit Complementation in Bacterial Bioluminescence in Photobacterium fischeri

Kenneth H Nealson a,1, Alvin Markovitz a
PMCID: PMC248215  PMID: 5479452

Abstract

Chemical mutagens were used to obtain mutants deficient in bioluminescence in the marine bacterium Photobacterium fischeri strain MAV. Acridine dyes were effective in the production of dark mutants but not in the production of auxotrophs. These dark mutants were all of one type and appeared to contain lesions blocking the synthesis of luciferase. ICR-191 was especially effective in the production of aldehyde mutants, i.e., dark strains that luminesce when a long-chain aldehyde such as n-decanal is added to them. However, other mutant types were isolated after treatment with ICR-191. N-methyl-N′-nitro-N-nitrosoguanidine induced many bioluminescence-deficient types with respect to both the site of the lesion and the quantitative effect on the luminescent system. We characterized the dark and dim mutants with respect to their response to exogenous decanal, levels of in vivo and in vitro luminescence, and their rates of reversion to wild type. In addition, the luciferases of the mutant strains were examined by subunit complementation. On the basis of these analyses, we identified mutants which synthesize altered luciferase, strains which are deficient in synthesis of luciferase, and aldehyde mutants. The results of analysis of luciferase from the aldehyde mutants and the complementation studies indicate that the lesions in these strains are in the luciferase itself. Results obtained with wild-type cells grown in minimal medium, and aldehyde mutant cells grown either in complete or minimal medium, indicate that a “natural aldehyde factor” is involved in in vivo light emission. These same studies showed that the long-chain aldehyde(s) could only partially substitute for the natural “aldehyde factor.” The possibility that the in vivo aldehyde factor is not a long-chain aldehyde is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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