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• W1488491608 endingPage "1164" @default.
• W1488491608 startingPage "1157" @default.
• W1488491608 abstract "In the Hupc mutants of Bradyrhizobium japonicum SR, regulation of expression of hydrogenase is altered; the mutants synthesize hydrogenase constitutively in the presence of atmospheric levels of oxygen. The DNA gyrase inhibitors nalidixic acid, novobiocin, and coumermycin were used to inhibit growth of wild-type and mutant cells. For each inhibitor tested, growth of mutant and wild-type strains was equally sensitive. However, in contrast to the wild type, the Hupc mutants synthesized hydrogenase in the presence of high levels of any inhibitor. Cells were incubated with the drugs and simultaneously labeled with 14C-labeled amino acids, and hydrogenase was immunoprecipitated with antibody to the large subunit of the enzyme. Fluorograms of antibody blots then were scanned to determine the relative amount of hydrogenase (large subunit) synthesized in the presence or absence of the gyrase inhibitors. The amount of hydrogenase synthesized by the Hupc mutants in the presence of 300 micrograms of nalidixic acid per ml was near the level of enzyme synthesized in the absence of the inhibitor. No hydrogenase was detected in antibody blots of wild-type cultures which were derepressed for hydrogenase in the presence of 100 micrograms of coumermycin or novobiocin per ml. In contrast, hydrogenase was synthesized by the Hupc mutants in the presence of 100 micrograms of either drug per ml. The amount synthesized ranged from 5 to 32% and 20 to 49%, respectively, of that in the absence of those inhibitors, but nevertheless, hydrogenase synthesis was detected in all of the mutants examined.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W1488491608 created "2016-06-24" @default.
• W1488491608 creator A5035303875 @default.
• W1488491608 creator A5076187405 @default.
• W1488491608 date "1989-05-01" @default.
• W1488491608 modified "2023-10-14" @default.
• W1488491608 title "Hydrogenase synthesis in Bradyrhizobium japonicum Hupc mutants is altered in sensitivity to DNA gyrase inhibitors" @default.
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• W1488491608 doi "https://doi.org/10.1128/aem.55.5.1157-1164.1989" @default.
• W1488491608 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/184270" @default.
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• W1488491608 hasPublicationYear "1989" @default.
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