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Budarina ZI, Nikitin DV, Zenkin N, Zakharova M, Semenova E, Shlyapnikov MG, Rodikova EA, Masyukova S, Ogarkov O, Baida GE, Solonin AS, Severinov K. A new Bacillus cereus DNA-binding protein, HlyIIR, negatively regulates expression of B. cereus haemolysin II. Microbiology (Reading) 2005; 150:3691-3701. [PMID: 15528656 DOI: 10.1099/mic.0.27142-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Haemolysin II, HlyII, is one of several cytotoxic proteins produced by Bacillus cereus, an opportunistic human pathogen that causes food poisoning. The hlyII gene confers haemolytic activity to Escherichia coli cells. Here a new B. cereus gene, hlyIIR, which is located immediately downstream of hlyII and regulates hlyII expression, is reported. The deduced amino acid sequence of HlyIIR is similar to prokaryotic DNA-binding transcriptional regulators of the TetR/AcrA family. Measurements of haemolytic activity levels and of hlyII promoter activity levels using gene fusions and primer-extension assays demonstrated that, in E. coli, hlyII transcription decreased in the presence of hlyIIR. Recombinant HlyIIR binds to a 22 bp inverted DNA repeat centred 48 bp upstream of the hlyII promoter transcription initiation point. In vitro transcription studies showed that HlyIIR inhibits transcription from the hlyII promoter by binding to the 22 bp repeat and RNA polymerase, and by decreasing the formation of the catalytically competent open promoter complex.
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Affiliation(s)
- Zhanna I Budarina
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Dmitri V Nikitin
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Nikolay Zenkin
- Waksman Institute for Microbiology, Rutgers, The State University of New Jersey, 190 Frelinghuysen Road, Piscataway, NJ 08854, USA
| | - Marina Zakharova
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Ekaterina Semenova
- Waksman Institute for Microbiology, Rutgers, The State University of New Jersey, 190 Frelinghuysen Road, Piscataway, NJ 08854, USA
| | - Michael G Shlyapnikov
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | | | - Svetlana Masyukova
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Oleg Ogarkov
- Waksman Institute for Microbiology, Rutgers, The State University of New Jersey, 190 Frelinghuysen Road, Piscataway, NJ 08854, USA
| | - Gleb E Baida
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Alexander S Solonin
- The Institute of Biochemistry and Physiology of Micro-organisms, Nauki Avenue, 5, Pushchino, 142292 Russia
| | - Konstantin Severinov
- Waksman Institute for Microbiology, Rutgers, The State University of New Jersey, 190 Frelinghuysen Road, Piscataway, NJ 08854, USA
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