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  • Title: A promoter switch that can rescue a plant sigma factor mutant.
    Author: Schweer J, Loschelder H, Link G.
    Journal: FEBS Lett; 2006 Dec 11; 580(28-29):6617-22. PubMed ID: 17118361.
    Abstract:
    Chloroplasts sigma factors act in concert with PEP, the bacterial-type plastid RNA polymerase. Using a sigma knockout line from Arabidopsis thaliana, we investigated mutant-specific changes in plastid gene expression at RNA level. One characteristic feature was the appearance of a long transcript that spans the atpB-E operon and extends considerably into the far-upstream region of atpB. This region reveals a cluster of typical promoter elements for NEP, the second (phage-type) plastid RNA polymerase. The NEP promoter cluster can help maintain RNA synthesis in situations where no functional sigma factor is available for PEP.
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