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There are three binding sites for NtcA (nir I,nir II, andnir III), the global nitrogen regulator of cyanobacteria, in the DNA region between the two divergently transcribed operons (nirA andnirB operons) involved in nitrate assimilation inSynechococcus sp. strain PCC 7942. Using theluxAB reporter system, we showed thatnir I andnir III, which are located 23 bp upstream from the −10 promoter element ofnirA andnirB , respectively, are required for induction by nitrogen depletion of thenirA andnirB operons, respectively. The induction ofnirA operon transcription was a prerequisite for the nitrite-responsive positive regulation of the transcription by NtcB, a LysR-type protein. The NtcA-binding sitenir II, located in the middle of thenirA-nirB intergenic region, and a potential binding site for a LysR-type protein (TGCAN5 TGCA; designated L1), located betweennir I andnir II, were required for the nitrite-responsive, NtcB-dependent enhancement ofnirA operon transcription. Although the requirement for the L1 site was consistent with the involvement of the LysR family protein NtcB in transcriptional regulation, NtcB did not bind to thenirA regulatory region in vitro in the presence of nitrite and NtcA, suggesting the involvement of some additional factor(s) in the regulation. An L1-like inverted repeat with the consensus sequence TGCN7 GCA was conserved in thenirA promoter region of cyanobacteria, being centered at position −23 with respect to the NtcA-binding site corresponding tonir I, which suggested the common occurrence of nitrite-responsive regulation of the nitrate assimilation operon among cyanobacteria.

journal of bacteriology

<i>cis</i> -Acting Sequences Required for NtcB-Dependent, Nitrite-Responsive Positive Regulation of the Nitrate Assimilation Operon in the Cyanobacterium <i>Synechococcus</i> sp. Strain PCC 7942

cis -Acting Sequences Required for NtcB-Dependent, Nitrite-Responsive Positive Regulation of the Nitrate Assimilation Operon in the Cyanobacterium Synechococcus sp. Strain PCC 7942