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Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry
Published on: March 24, 2012
iTRAQ-facilitated proteomic analysis of Bacillus cereus via degradation of malachite green
Bobo Wang1, Jing Lu1, Junfang Zheng2
1College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Abstract:
The wide use of malachite green (MG) as a dye has caused substantial concern owing to its toxicity. Bacillus cereus can against the toxic effect of MG and efficiently decolourise it. However, detailed information regarding its underlying adaptation and degradation mechanisms based on proteomic data is scarce. In this study, the isobaric tags for relative and absolute quantitation (iTRAQ)-facilitated quantitative method was applied to analyse the molecular mechanisms by which B. cereus degrades MG. Based on this analysis, 209 upregulated proteins and 198 downregulated proteins were identified with a false discovery rate of 1% or less during MG biodegradation. Gene ontology and KEGG analysis determined that the differentially expressed proteins were enriched in metabolic processes, catalytic activity, antioxidant activity, and responses to stimuli. Furthermore, real-time qPCR was utilised to further confirm the regulated proteins involved in benzoate degradation. The proteins BCE_4076 (Acetyl-CoA acetyltransferase), BCE_5143 (Acetyl-CoA acetyltransferase), BCE_5144 (3-hydroxyacyl-CoA dehydrogenase), BCE_4651 (Enoyl-CoA hydratase), and BCE_5474 (3-hydroxyacyl-CoA dehydrogenase) involved in the benzoate degradation pathway may play an important role in the biodegradation of MG by B. cereus. The results of this study not only provide a comprehensive view of proteomic changes in B. cereus upon MG loading but also shed light on the mechanism underlying MG biodegradation by B. cereus.
Insights
Bacillus cereus effectively degrades toxic malachite green (MG) dye. Proteomic analysis revealed specific proteins involved in benzoate degradation pathways, uncovering key mechanisms for MG biodegradation by this bacterium.
Area of Science:
- Microbiology
- Environmental Biotechnology
- Proteomics
Background:
- Malachite green (MG) is a widely used dye with significant toxicity concerns.
- Bacillus cereus exhibits resistance and decolorization capabilities against MG.
- Limited proteomic data exists on the adaptation and degradation mechanisms of B. cereus for MG.
Purpose of the Study:
- To elucidate the molecular mechanisms of malachite green biodegradation by Bacillus cereus using a quantitative proteomic approach.
- To identify proteins and pathways involved in B. cereus adaptation and MG degradation.
Main Methods:
- Quantitative proteomic analysis using isobaric tags for relative and absolute quantitation (iTRAQ).
- Identification and quantification of differentially expressed proteins.
- Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis.
- Validation of key protein expression using real-time quantitative PCR (qPCR).
Main Results:
- 209 proteins were upregulated and 198 were downregulated in B. cereus during MG biodegradation (FDR ≤ 1%).
- Differentially expressed proteins were significantly enriched in metabolic processes, catalytic activity, antioxidant activity, and response to stimuli.
- Proteins involved in the benzoate degradation pathway, including Acetyl-CoA acetyltransferase and 3-hydroxyacyl-CoA dehydrogenase, were identified as potentially crucial for MG biodegradation.
Conclusions:
- Proteomic analysis provides a comprehensive view of B. cereus's response to malachite green exposure.
- Specific enzymes in the benzoate degradation pathway are key players in the biodegradation of malachite green by B. cereus.
- This study enhances understanding of the microbial mechanisms for degrading toxic industrial dyes.
