Strategies for Rapid Identification of Acinetobacter baumannii Membrane Proteins and Polymyxin B's Effects
Yun Lu1, Xinxin Hu1, Tongying Nie1
1Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Abstract:
Acinetobacter baumannii, especially multidrug resistant Acinetobacter baumannii, is a notable source of pressure in the areas of public health and antibiotic development. To overcome this problem, attention has been focused on membrane proteins. Different digestion methods and extraction detergents were examined for membrane proteome sample preparation, and label-free quantitative and targeted proteome analyses of the polymyxin B-induced Acinetobacter baumannii ATCC 19606 membrane proteome were performed based on nano LC-MS/MS. Ultracentrifugation of proteins at a speed of 150,000×g, digestion by trypsin, filter-aided sample preparation, and detergents such as lauryldimethylamine-N-oxide were proved as a fast and effective way for identification of membrane proteome by nano LC-MS/MS. Upon treatment with polymyxin B, expression levels of 15 proteins related to membrane structure, transporters, cell surface, and periplasmic space were found to be significantly changed. Furthermore, targeted proteome was also used to confirm these changes. A relatively rapid membrane proteome preparation method was developed, and a more comprehensive view of changes in the Acinetobacter baumannii membrane proteome under polymyxin B pressure was obtained.
Insights
Researchers developed a rapid method to analyze the membrane proteome of multidrug-resistant Acinetobacter baumannii. This study identified key protein changes in response to polymyxin B, aiding antibiotic development.
Area of Science:
- Microbiology and Proteomics
- Focus on bacterial membrane proteins and their role in antibiotic resistance.
Background:
- Multidrug-resistant Acinetobacter baumannii poses a significant public health threat.
- Membrane proteins are crucial targets for understanding and combating antibiotic resistance.
Purpose of the Study:
- To develop an efficient method for preparing membrane proteome samples from Acinetobacter baumannii.
- To investigate changes in the membrane proteome of Acinetobacter baumannii upon exposure to polymyxin B.
Main Methods:
- Utilized ultracentrifugation, trypsin digestion, filter-aided sample preparation, and lauryldimethylamine-N-oxide detergent.
- Employed nano LC-MS/MS for label-free quantitative and targeted proteome analysis.
- Investigated the Acinetobacter baumannii ATCC 19606 strain under polymyxin B induction.
Main Results:
- Established a fast and effective membrane proteome preparation protocol.
- Identified significant expression level changes in 15 proteins involved in membrane structure, transport, and periplasmic functions.
- Confirmed proteomic alterations using targeted proteome analysis.
Conclusions:
- A rapid and comprehensive method for Acinetobacter baumannii membrane proteome analysis was successfully developed.
- Polymyxin B treatment induces significant changes in key membrane proteins, offering insights into resistance mechanisms.
- Findings contribute to a better understanding of Acinetobacter baumannii's response to antibiotics.
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