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The Application of Open Searching-based Approaches for the Identification of Acinetobacter baumannii O-linked Glycopeptides
Published on: November 2, 2021
Identification of immunogenic proteins of the bacterium Acinetobacter baumannii using a proteomic approach
Renata Fajardo Bonin1, Alex Chapeaurouge, Jonas Perales
1Instituto de Tecnologia em Imunobiológicos, Fiocruz, Rio de Janeiro, Brazil.
Purpose:
Acinetobacter baumannii is an important opportunistic pathogen that causes pneumoniae, urinary tract infections, and/or septicemia in immunocompromised patients. This pathogen is frequently associated with nosocomial outbreaks worldwide and has become particularly problematic because of its prevalence and resistance patterns to several antibiotics. In the present study, we used an immunoproteome-based approach to identify immunogenic proteins located on the surface of A. baumannii for the development of a possible immunotherapy against this devastating bacterial infection.
Experimental Design:
Sera from patients with A. baumannii infections (n = 50) and from a control group of healthy individuals (n = 3) were analyzed for reactivity against A. baumannii outer membrane proteins (OMPs) using Western blot analysis. To identify potential immunogenic proteins in A. baumannii, OMPs were separated by 2DE, and reactive sera from infected patients were randomly selected and divided into two different pools, each containing 15 sera. Finally, MALDI-TOF/TOF mass spectrometric analysis was employed to identify the corresponding proteins.
Results:
This analysis identified six immunoreactive proteins: OmpA, Omp34kDa, OprC, OprB-like, OXA-23, and ferric siderophore receptor protein. Notably, these proteins are highly abundant on the bacterial surface and involved in virulence, antibiotic resistance, and growth.
Conclusions And Clinical Relevance:
Our results support the notion that the proteins identified in the present immunoproteome study could serve as antigen candidates for the development of vaccines and passive immunotherapies against A. baumannii infections.
Insights
Researchers identified six key surface proteins on Acinetobacter baumannii, a dangerous bacterium. These proteins show promise as targets for new vaccines and immunotherapies to combat antibiotic-resistant infections.
Area of Science:
- Microbiology
- Immunology
- Proteomics
Background:
- Acinetobacter baumannii is a significant opportunistic pathogen causing severe infections like pneumonia and septicemia, particularly in hospital settings.
- High prevalence and antibiotic resistance make A. baumannii a global health concern, necessitating novel therapeutic strategies.
Purpose of the Study:
- To identify immunogenic surface proteins of A. baumannii using an immunoproteome approach.
- To explore potential vaccine and immunotherapy targets against A. baumannii infections.
Main Methods:
- Outer membrane proteins (OMPs) from A. baumannii were analyzed using Western blot with sera from infected patients and healthy controls.
- Two-dimensional electrophoresis (2DE) separated OMPs, followed by MALDI-TOF/TOF mass spectrometry for protein identification.
Main Results:
- Six immunoreactive proteins were identified: OmpA, Omp34kDa, OprC, OprB-like, OXA-23, and a ferric siderophore receptor protein.
- These identified proteins are abundant on the bacterial surface and implicated in virulence, antibiotic resistance, and bacterial growth.
Conclusions:
- The identified proteins are potential antigen candidates for developing vaccines against A. baumannii.
- These findings support the development of passive immunotherapies to combat A. baumannii infections.
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