A small basic protein from the brz-brb operon is involved in regulation of bop transcription in Halobacterium salinarum

Valery Tarasov, Rita Schwaiger, Katarina Furtwangler, Katrina Furtwaengler, Michael Dyall-Smith, Dieter Oesterhelt

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Abstract

BackgroundThe halophilic archaeon Halobacterium salinarum expresses bacteriorhodopsin, a retinal-protein that allows photosynthetic growth. Transcription of the bop (bacterioopsin) gene is controlled by two transcription factors, Bat and Brz that induce bop when cells are grown anaerobically and under light.ResultsA new gene was identified that is transcribed together with the brz gene that encodes a small basic protein designated as Brb (bacteriorhodopsin-regulating basic protein). The translation activity of start codon of the brb gene was confirmed by BgaH reporter assays. In vivo site-directed mutagenesis of the brb gene showed that the Brb protein cooperates with Brz in the regulation of bop expression. Using a GFP reporter assay, it was demonstrated that Brb cooperates with both Brz and Bat proteins to activate bop transcription under phototrophic growth conditions.ConclusionsThe activation of the bop promoter was shown to be dependent not only on two major factors, Bat and Brz, but is also tuned by the small basic protein, Brb.
Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalBMC Molecular Biology
Volume12
Issue number42
DOIs
Publication statusPublished - Sep 2011

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    Tarasov, V., Schwaiger, R., Furtwangler, K., Furtwaengler, K., Dyall-Smith, M., & Oesterhelt, D. (2011). A small basic protein from the brz-brb operon is involved in regulation of bop transcription in Halobacterium salinarum. BMC Molecular Biology, 12(42), 1-15. https://doi.org/10.1186/1471-2199-12-42