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. 1989 Feb;171(2):1093–1099. doi: 10.1128/jb.171.2.1093-1099.1989

An rpoN-like gene of Alcaligenes eutrophus and Pseudomonas facilis controls expression of diverse metabolic pathways, including hydrogen oxidation.

D Römermann 1, J Warrelmann 1, R A Bender 1, B Friedrich 1
PMCID: PMC209706  PMID: 2536672

Abstract

Pleiotropic mutants of Alcaligenes eutrophus with the phenotype Hno- have been characterized previously. They are deficient in several diverse metabolic activities, including hydrogen oxidation, nitrate and urea assimilation, denitrification, and various substrate transport systems. Phenotypically similar mutants were identified among hydrogenase-deficient strains of Pseudomonas facilis. The Tn5-labeled hno gene was cloned from a genomic DNA library of A. eutrophus and used to identify the corresponding unimpaired wild-type DNA sequence. The recombinant plasmid pCH148 contained an insert of 12.3 kilobase pairs and was shown to restore the Hno+ phenotype to mutants of A. eutrophus and P. facilis. A cosmid isolated from a DNA library of P. facilis also exhibited intergeneric Hno-complementing activity. The cloned hno loci from both organisms showed DNA homology by Southern blot hybridization. A subclone of pCH148 which contained a 6.5-kilobase-pair insert was constructed. The resulting hybrid, pCH170, not only was able to complement Hno- mutants but also relieved glutamine auxotrophy in NtrA- mutants of enteric bacteria. This suggests that the hno gene product from A. eutrophus is functionally similar to the NtrA protein, which has been identified as a novel sigma factor (sigma 54) of RNA polymerase.

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Selected References

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