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© Mélanie Falord, Tarek Msadek, Jean-Marc Panaud
Staphylococcus aureus "golden staph" in scanning electron microscopy.
Publication : The Journal of biological chemistry

In vitro reconstitution of transcriptional antitermination by the SacT and SacY proteins of Bacillus subtilis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of biological chemistry - 01 Aug 1996

Arnaud M, Débarbouillé M, Rapoport G, Saier MH, Reizer J

Link to Pubmed [PMID] – 8702561

J. Biol. Chem. 1996 Aug;271(31):18966-72

Expression of the sacPA and sacB genes of Bacillus subtilis is positively modulated by transcriptional regulatory proteins encoded by the sacT and sacY genes, respectively. Previous genetic studies led to the suggestion that SacT and SacY function as nascent mRNA binding proteins preventing early termination of transcription at terminators located in the leader regions of the corresponding genes. Here we report the overproduction, purification to near homogeneity, and characterization of the two antiterminators, SacT and SacY. Using mRNA band migration retardation assays and a reconstituted transcriptional antitermination system, the mRNA binding functions and antitermination activities of purified SacT and SacY are demonstrated under in vitro conditions. The results establish for the first time that members of the BglG family of antiterminators function in antitermination in the absence of other proteins in vitro. Purified SacT is shown to be phosphorylated by phosphoenolpyruvate in a phosphotransferase-catalyzed reaction dependent on Enzyme I and HPr. Unexpectedly, the purified SacT is shown to be functional in mRNA binding and in transcriptional antitermination independently of its phosphorylation state.

http://www.ncbi.nlm.nih.gov/pubmed/8702561