title: Positive regulation by nitrite of the nitrate assimilation operon in the cyanobacteria Synechococcus sp. strain PCC 7942 and Plectonema boryanum.
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.
authors.affiliation: Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kikuchi
authors.forename: M
authors.initials: M
authors.lastname: Aichi
authors.forename: I
authors.initials: I
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Omato
mesh_terms: D027321:Anion Transport Proteins; D001426:Bacterial Proteins / Q000096:biosynthesis; D002352:Carrier Proteins / Q000096:biosynthesis; D000458:Cyanobacteria / Q000187:drug effects / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D008957:Models, Genetic; D009154:Mutation; D050901:Nitrate Reductase; D009565:Nitrate Reductases / Q000096:biosynthesis / Q000235:genetics; D000091285:Nitrate Transporters; D009566:Nitrates / Q000378:metabolism*; D009572:Nitrite Reductases / Q000096:biosynthesis / Q000235:genetics; D009573:Nitrites / Q000494:pharmacology*; D009876:Operon; D012329:RNA, Bacterial / Q000032:analysis; D012333:RNA, Messenger / Q000032:analysis; D013045:Species Specificity
chemical_list: D027321:Anion Transport Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D000091285:Nitrate Transporters; D009566:Nitrates; D009573:Nitrites; D012329:RNA, Bacterial; D012333:RNA, Messenger; D009565:Nitrate Reductases; D009572:Nitrite Reductases; D050901:Nitrate Reductase