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. 1984 May;158(2):603–608. doi: 10.1128/jb.158.2.603-608.1984

Positive control of the L-rhamnose genetic system in Salmonella typhimurium LT2.

S Al-Zarban, L Heffernan, J Nishitani, L Ransone, G Wilcox
PMCID: PMC215471  PMID: 6327613

Abstract

A total of 28 L-rhamnose-negative mutants in Salmonella typhimurium LT2 were all linked by P22 transduction and were classified into five groups on the basis of genetic and biochemical experiments. Deletion mapping showed that the gene order was rhaD rhaA rhaB rhaC rhaT . rhaA mutants lacked an inducible L-rhamnose isomerase, rhaB mutants lacked an inducible L- rhamnulokinase , and rhaD mutants were probably defective in L- rhamnulose -1-phosphate aldolase. Mutants that were unable to accumulate L-[14C]rhamnose but could grow on 1% L-rhamnose were designated rhaT to indicate a defect in L-rhamnose transport. Genetic evidence supports the hypothesis that the rhaC gene is a positive regulator of rha gene expression. (i) Pleiotropically negative mutants in the rhaC gene were isolated at a high frequency. (ii) Mutants containing an insertion or deletion within the rhaC gene had a pleiotropically negative phenotype. (iii) Complementation tests indicated that rhaC + was dominant to rhaC -. (iv) Rha+ revertants of deletion and Tn10 insertion mutations in the rhaC gene were isolated.

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Selected References

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