1887

Abstract

DevR is a transcriptional regulator that mediates the genetic response of to oxygen limitation and nitric oxide exposure. is co-transcribed along with , which encodes its cognate sensor kinase, and an upstream gene, . The transcriptional activity of this operon was characterized by primer extension, transcriptional fusion and electrophoretic mobility shift assays (EMSAs) under aerobic conditions. Transcription start points (Tsps) were detected upstream of both and , and the major transcript was derived from upstream of . Sequences with similarity to sigma factor consensus elements and to DevR-binding motifs were detected in the vicinity of the Tsps by analysis. EMSAs with promoter regions and DevR protein showed that DevR binds to its own promoters in a sequence-specific manner with differing affinities. Consistent with the primer extension and EMSA data, promoters, and not promoters, were determined to be the principal promoters of this operon using reporter assays performed in and . Furthermore, DevR modulated the activity of both and c promoters. From these findings it is inferred that the operon is transcribed from multiple promoters and is autoregulated.

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2005-12-01
2019-11-15
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