Sigma Factor Genes sigC , sigE , and sigG Are Upregulated in Heterocysts of the Cyanobacterium Anabaena sp. Strain PCC 7120
- 15 November 2007
- journal article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 189 (22) , 8392-8396
- https://doi.org/10.1128/jb.00821-07
Abstract
We used gfp transcriptional fusions to investigate the regulation of eight sigma factor genes during heterocyst development in the cyanobacterium Anabaena sp. strain PCC 7120. Reporter strains containing gfp fusions with the upstream regions of sigB2, sigD, sigI, and sigJ did not show developmental regulation. Time-lapse microscopy of sigC, sigE, and sigG reporter strains showed increased green fluorescent protein fluorescence in differentiating cells at 4 h, 16 h, and 9 h, respectively, after nitrogen step down.Keywords
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