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. 1991 Jan;173(1):23–27. doi: 10.1128/jb.173.1.23-27.1991

Identification of genes and gene products whose expression is activated during nitrogen-limited growth in Bacillus subtilis.

M R Atkinson 1, S H Fisher 1
PMCID: PMC207151  PMID: 1670935

Abstract

The levels of urease and asparaginase were elevated 25- and 20-fold, respectively, in extracts of Bacillus subtilis cells grown in medium containing nitrogen sources that are poor sources of ammonium (NH4+) compared with the levels seen in extracts of cells grown in medium containing nitrogen sources that are good sources of NH4+. To determine whether a collection of genes whose expression responds to nitrogen availability could be isolated, a library of Tn917-lacZ insertions was screened for nitrogen-regulated beta-galactosidase expression. Two fusion strains were identified. beta-Galactosidase expression was 26- and 4,000-fold higher, respectively, in the nrg-21::Tn917-lacZ and the nrg-29::Tn917-lacZ insertion strains during NH4(+)-restricted growth than during growth on nitrogen sources that are good sources of NH4+. PBS1 transduction analysis showed that the nrg-21::Tn917-lacZ insertion mapped between gutB and purB and that the nrg-29::Tn917-lacZ insertion mapped between degSU and spoIID. The repression of expression of these four gene products during growth on good sources of NH4+ required the wild-type glutamine synthetase protein but not the glutamine synthetase regulatory protein, GlnR.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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