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. 1996 Oct;178(19):5822–5825. doi: 10.1128/jb.178.19.5822-5825.1996

Positive regulation by nitrite of the nitrate assimilation operon in the cyanobacteria Synechococcus sp. strain PCC 7942 and Plectonema boryanum.

H Kikuchi 1, M Aichi 1, I Suzuki 1, T Omato 1
PMCID: PMC178430  PMID: 8824636

Abstract

In the absence of fixation of ammonium to glutamine, nitrate and nitrite activated transcription of the nitrate assimilation (nirA-nrtABCD-narB) operon of Synechococcus sp. strain PCC 7942. In a nitrate reductase-deficient mutant, only nitrite activated transcription, indicating that nitrite is the actual activator of the operon. Nitrate and nitrite were also found to activate the transcription of a nitrate assimilation operon in the filamentous nonheterocystous nitrogen-fixing cyanobacterium Plectonema boryanum.

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Selected References

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