ANALYSIS OF THE SEQUENCES WITHIN AND FLANKING THE CYANOGLOBIN-ENCODING GENE, GLBN, OF THE CYANOBACTERIUM NOSTOC COMMUNE UTEX-584

A 3.5-kb segment of DNA containing nifU glbN nifH nifD was cloned from a gene library of Nostoc 584 and sequenced. The nifU-glbN intergenic region contains short tandemly repeated repetitive sequences (5'-AATTACG). A sequence corresponding to a NifA-like upstream activator sequence (with the consensus recognition sequence for BifA in Anabnena 7120), elements of a nifH promoter and a sequence that may function as a transcription terminator, were identified downstream from glbN, GlbN, unique to certain Nostoc spp., is more homologous to protozoan myoglobins than to any other prokaryotic, vertebrate or plant globins.