Identification and characterization of two nitrogen-regulated genes of the cyanobacterium Synechococcus sp. strain PCC7942 required for maximum efficiency of nitrogen assimilation.

Abstract excerpt

Two nitrogen-regulated genes were found in the genomic DNA region upstream of the nirA operon involved in uptake and utilization of nitrate in Synechococcus sp. strain PCC7942. The two genes (nirB and ntcB) are transcribed divergently from nirA and encode proteins of 349 and 309 amino acid residues, respectively. The levels of nirB and ntcB transcripts were low in cells growing on ammonium and increased upon...

Topics

• Amino Acid Sequence
• Ammonium Sulfate
• Bacterial Proteins
• Base Sequence
• Cyanobacteria
• Genes, Bacterial
• Molecular Sequence Data
• Mutagenesis, Insertional
• Nitrates
• Nitrogen
• Phenotype