Abstract
Mutants of Klebsiella aerogenes containing genetic fusions of glnA to lacZ were isolated by using Mu dl (lac, bla) bacteriophage and a Mu Kmr helper phage with the host range of bacteriophage P1. Synthesis of beta-galactosidase in these strains is regulated in response to nitrogen metabolites and regulatory gln loci and is rendered constitutive by a mutation in the linked glnL gene. Complementation studies indicated that glnL is a separate locus from glnA and glnG and that insertions in glnA are partially polar on glnL expression. These results support the hypothesis that glnA, glnL, and glnG are organized in an operon with multiple promoters.
MeSH Terms
DNA, Recombinant
Gene Expression
Gene Expression Regulation
Genes, Regulator
Genetic Linkage
Glutamate-Ammonia Ligase/genetics
Histidine Ammonia-Lyase/biosynthesis
Klebsiella pneumoniae/enzymology,genetics
Lac Operon
Transcription, Genetic
beta-Galactosidase/biosynthesis
Chemicals
DNA, Recombinant
beta-Galactosidase
Histidine Ammonia-Lyase
Glutamate-Ammonia Ligase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Goldie H
Magasanik B
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18 references, click to expand
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