Positive regulation by nitrite of the nitrate assimilation operon in the cyanobacteria Synechococcus sp. strain PCC 7942 and Plectonema boryanum.
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.
Kikuchi
H
H
Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University, Japan.
Aichi
M
M
Suzuki
I
I
Omato
T
T
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
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