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. 1984 Jan;157(1):53–58. doi: 10.1128/jb.157.1.53-58.1984

Cloning of genes involved in the biosynthesis of pseudobactin, a high-affinity iron transport agent of a plant growth-promoting Pseudomonas strain.

J C Moores, M Magazin, G S Ditta, J Leong
PMCID: PMC215128  PMID: 6690426

Abstract

A gene bank of DNA from plant growth-promoting Pseudomonas sp. strain B10 was constructed using the broad host-range conjugative cosmid pLAFR1. The recombinant cosmids contained insert DNA averaging 21.5 kilobase pairs in length. Nonfluorescent mutants of Pseudomonas sp. strain B10 were obtained by mutagenesis with N-methyl-N'-nitro-N-nitrosoguanidine, ethyl methanesulfonate, or UV light and were defective in the biosynthesis of its yellow-green, fluorescent siderophore (microbial iron transport agent) pseudobactin. No yellow-green, fluorescent mutants defective in the production of pseudobactin were identified. Nonfluorescent mutants were individually complemented by mating the gene bank en masse and identifying fluorescent transconjugants. Eight recombinant cosmids were sufficient to complement 154 nonfluorescent mutants. The pattern of complementation suggests that a minimum of 12 genes arranged in four gene clusters is required for the biosynthesis of pseudobactin. This minimum number of genes seems reasonable considering the structural complexity of pseudobactin.

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Selected References

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