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Kovalevskiy OV, Lebedev AA, Surin AK, Solonin AS, Antson AA. Crystal structure of Bacillus cereus HlyIIR, a transcriptional regulator of the gene for pore-forming toxin hemolysin II. J Mol Biol 2007; 365:825-34. [PMID: 17097673 PMCID: PMC1828608 DOI: 10.1016/j.jmb.2006.10.074] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Revised: 10/19/2006] [Accepted: 10/23/2006] [Indexed: 01/07/2023]
Abstract
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.
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Affiliation(s)
- Oleg V. Kovalevskiy
- Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
- Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Andrey A. Lebedev
- Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Alexei K. Surin
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Alexander S. Solonin
- Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
- Corresponding authors. Alexander S. Solonin is to be contacted at Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. Alfred A. Antson, Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Alfred A. Antson
- Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
- Corresponding authors. Alexander S. Solonin is to be contacted at Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. Alfred A. Antson, Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
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