2fx0
From Proteopedia
Crystal Structure of HlyIIR, a Hemolysin II transcriptional Regulator
Overview
Production of Bacillus cereus and Bacillus anthracis toxins is controlled by a number of transcriptional regulators. Here we report the crystal structure of B. cereus HlyIIR, a regulator of the gene encoding the pore-forming toxin hemolysin II. We show that HlyIIR forms a tight dimer with a fold and overall architecture similar to the TetR family of repressors. A remarkable feature of the structure is a large internal cavity with a volume of 550 A(3) suggesting that the activity of HlyIIR is modulated by binding of a ligand, which triggers the toxin production. Virtual ligand library screening shows that this pocket can accommodate compounds with molecular masses of up to 400-500 Da. Based on structural data and previous biochemical evidence, we propose a model for HlyIIR interaction with the DNA.
About this Structure
2FX0 is a Single protein structure of sequence from Bacillus cereus. Full crystallographic information is available from OCA.
Reference
Crystal structure of Bacillus cereus HlyIIR, a transcriptional regulator of the gene for pore-forming toxin hemolysin II., Kovalevskiy OV, Lebedev AA, Surin AK, Solonin AS, Antson AA, J Mol Biol. 2007 Jan 19;365(3):825-34. Epub 2006 Oct 26. PMID:17097673 Page seeded by OCA on Sun May 4 04:24:19 2008
