Investigation of Rifampicin Resistance Mechanisms in Brucella abortus Using MS-Driven Comparative Proteomics
详细信息 查看全文
- 作者：Vassilios Sandalakis ; Anna Psaroulaki ; Pieter-Jan De Bock ; Athanasia Christidou ; Kris Gevaert ; Georgios Tsiotis ; Yiannis Tselentis
- 刊名：Journal of Proteome Research
- 出版年：2012
- 出版时间：April 6, 2012
- 年：2012
- 卷：11
- 期：4
- 页码：2374-2385
- 全文大小：382K
- 年卷期：v.11,no.4(April 6, 2012)
- ISSN：1535-3907
文摘
Mutations in the rpoB gene have already been shown to contribute to rifampicin resistance in many bacterial strains including Brucella species. Resistance against this antibiotic easily occurs and resistant strains have already been detected in human samples. We here present the first research project that combines proteomic, genomic, and microbiological analysis to investigate rifampicin resistance in an in vitro developed rifampicin resistant strain of Brucella abortus 2308. In silico analysis of the rpoB gene was performed and several antibiotics used in the therapy of Brucellosis were used for cross resistance testing. The proteomic profiles were examined and compared using MS-driven comparative proteomics. The resistant strain contained an already described mutation in the rpoB gene, V154F. A correlation between rifampicin resistance and reduced susceptibility on trimethoprim/sulfamethoxazole was detected by E-test and supported by the proteomics results. Using 12鈥?36 MS/MS spectra we identified 6753 peptides corresponding to 456 proteins. The resistant strain presented 39 differentially regulated proteins most of which are involved in various metabolic pathways. Results from our research suggest that rifampicin resistance in Brucella mostly involves mutations in the rpoB gene, excitation of several metabolic processes, and perhaps the use of the already existing secretion mechanisms at a more efficient level.