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Proteomic Analyses of Acinetobacter baumannii Clinical Isolates to Identify Drug Resistant Mechanism
Ping Wang1, Ren-Qing Li2, Lei Wang3
1Department of Microbiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China.
Abstract:
Acinetobacter baumannii is one of the main causes of nosocomial infections. Increasing numbers of multidrug-resistant Acinetobacter baumannii cases have been reported in recent years, but its antibiotic resistance mechanism remains unclear. We studied 9 multidrug-resistant (MDR) and 10 drug-susceptible Acinetobacter baumannii clinical isolates using Label free, TMT labeling approach and glycoproteomics analysis to identify proteins related to drug resistance. Our results showed that 164 proteins exhibited different expressions between MDR and drug-susceptible isolates. These differential proteins can be classified into six groups: a. proteins related to antibiotic resistance, b. membrane proteins, membrane transporters and proteins related to membrane formation, c. Stress response-related proteins, d. proteins related to gene expression and protein translation, e. metabolism-related proteins, f. proteins with unknown function or other functions containing biofilm formation and virulence. In addition, we verified seven proteins at the transcription level in eight clinical isolates by using quantitative RT-PCR. Results showed that four of the selected proteins have positive correlations with the protein level. This study provided an insight into the mechanism of antibiotic resistance of multidrug-resistant Acinetobacter baumannii.
Insights
This study investigated multidrug-resistant Acinetobacter baumannii, identifying 164 differentially expressed proteins linked to antibiotic resistance mechanisms. Findings offer insights into combating hospital-acquired infections caused by this pathogen.
Area of Science:
- Microbiology
- Molecular Biology
- Proteomics
Background:
- Acinetobacter baumannii is a significant cause of nosocomial infections.
- Rising multidrug-resistant (MDR) strains pose a critical threat, yet resistance mechanisms are not fully understood.
Purpose of the Study:
- To identify proteins associated with antibiotic resistance in MDR Acinetobacter baumannii.
- To elucidate the molecular mechanisms underlying drug resistance in this opportunistic pathogen.
Main Methods:
- Comparative proteomic analysis using label-free and TMT labeling approaches on MDR and drug-susceptible Acinetobacter baumannii clinical isolates.
- Glycoproteomics analysis to identify proteins related to drug resistance.
- Quantitative RT-PCR to validate protein expression at the transcriptional level.
Main Results:
- 164 proteins showed differential expression between MDR and drug-susceptible isolates.
- These proteins are involved in antibiotic resistance, membrane transport, stress response, gene expression, metabolism, and virulence factors like biofilm formation.
- Four out of seven validated proteins showed a positive correlation between protein and transcript levels.
Conclusions:
- The study provides a comprehensive proteomic profile of MDR Acinetobacter baumannii.
- Identified proteins offer potential targets for understanding and overcoming antibiotic resistance mechanisms in clinical settings.
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