Abstract The transcriptional antisilencer VirB acts as a master regulator of virulence gene expression in the human pathogen Shigella flexneri. It binds DNA sequences (virS) upstream of VirB-dependent promoters and counteracts their silencing by the nucleoid-organizing protein H-NS. However. its precise mode of action remains unclear. https://ashleyshomestores.shop/product-category/boxes-set-of-3/