1887

Abstract

The interplay between Fur (ferric uptake regulator) proteins and small, non-coding RNAs has been described as a key regulatory loop in several bacteria. In the filamentous cyanobacterium sp. PCC 7120, a large dicistronic transcript encoding the putative membrane protein Alr1690 and an α- RNA is involved in the modulation of the global regulator FurA. In this work we report the existence of three novel antisense RNAs in cyanobacteria and show that a α- RNA is conserved in very different genomic contexts, namely in the unicellular cyanobacteria PCC 7806 and sp. PCC 6803. Syα- RNA covers only part of the coding sequence of the orthologue , whose flanking genes encode two hypothetical proteins. Transcriptional analysis of and its adjacent genes in unravels a highly compact organization of this locus involving overlapping transcripts. Maα- RNA spans the whole Ma CDS and part of the flanking and sequences. In addition, Ma seems to be part of a dicistronic operon encoding this regulator and an α- RNA. These results allow new insights into the transcriptomes of two unicellular cyanobacteria and suggest that in PCC 7806, the α- α- RNAs might participate in a regulatory connection between the genes of the locus.

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2011-12-01
2019-10-22
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