Nucleotide sequence of the narB gene encoding assimilatory nitrate reductase from the cyanobacterium Oscillatoria chalybea

摘要

The nucleotide sequence of the structural gene of nitrate reductase (narB) lias been determined from the filamentous, non-hetero-cystcuis cyanobacterium Oscillutoriu chalyhea. The nurli gene enemies a protein of 737 amino acid residues, which shows 61% identity to nitrate reductase of the unicellular cyanobacterium Synechococcus sp. PCC 7042 and only weak homologies to different bacterial molybdoenzymes, such as nitrate reductases or formate dehydrogenases,