NtcA-regulated heterocyst differentiation genes hetC and devB from Anabaena sp. strain PCC 7120 exhibit a similar tandem promoter arrangement.

Abstract excerpt

Transcription of the hetC gene, whose product is required for heterocyst differentiation, takes place from a long promoter region that includes the previously described HetR-independent, NtcA-activated promoter producing transcripts with a 5' end corresponding to position -571 with respect to the translational start site of hetC. Northern blot analysis indicated that the accumulation of hetC transcripts depends...

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