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Proteomic Profiling of Macrophages by 2D Electrophoresis
Published on: November 4, 2014
Detection of Nuclear Protein Profile Changes by Human Metapneumovirus M2-2 Protein Using Quantitative Differential
Yuping Ren1,2, Eunjin Choi3, Ke Zhang4
1Department of Pediatrics, University of Texas Medical Branch, Galveston, TX 77555, USA. ypren@tjh.tjmu.edu.cn.
Abstract:
Human metapneumovirus (hMPV) is a leading cause of lower respiratory infection in pediatric populations globally. This study examined proteomic profile changes in A549 cells infected with hMPV and two attenuated mutants with deleted PDZ domain-binding motif(s) in the M2-2 protein. These motifs are involved in the interruption of antiviral signaling, namely the interaction between the TNF receptor associated factor (TRAF) and mitochondrial antiviral-signaling (MAVS) proteins. The aim of this study was to provide insight into the overall and novel impact of M2-2 motifs on cellular responses via an unbiased comparison. Tandem mass tagging, stable isotope labeling, and high-resolution mass spectrometry were used for quantitative proteomic analysis. Using quantitative proteomics and Venn analysis, 1248 common proteins were detected in all infected samples of both technical sets. Hierarchical clustering of the differentiated proteome displayed distinct proteomic signatures that were controlled by the motif(s). Bioinformatics and experimental analysis confirmed the differentiated proteomes, revealed novel cellular biological events, and implicated key pathways controlled by hMPV M2-2 PDZ domain-binding motif(s). This provides further insight for evaluating M2-2 mutants as potent vaccine candidates.
Insights
This study reveals how human metapneumovirus (hMPV) M2-2 protein motifs impact cellular responses. Understanding these motifs offers insights for developing effective hMPV vaccines.
Area of Science:
- Virology
- Proteomics
- Immunology
Background:
- Human metapneumovirus (hMPV) is a significant cause of pediatric lower respiratory infections worldwide.
- The M2-2 protein's PDZ domain-binding motifs are implicated in disrupting antiviral signaling pathways, specifically the TRAF-MAVS interaction.
Purpose of the Study:
- To investigate the proteomic changes in A549 cells upon infection with hMPV and its attenuated M2-2 motif mutants.
- To elucidate the novel and overall impact of M2-2 motifs on cellular responses using an unbiased proteomic approach.
Main Methods:
- Quantitative proteomic analysis using tandem mass tagging and stable isotope labeling.
- High-resolution mass spectrometry for protein identification and quantification.
- Bioinformatic and experimental validation of proteomic data.
Main Results:
- 1248 common proteins were identified across all hMPV-infected samples.
- Distinct proteomic signatures were observed, correlating with the presence or absence of M2-2 motifs.
- Novel cellular events and key pathways influenced by hMPV M2-2 PDZ domain-binding motifs were identified.
Conclusions:
- The M2-2 PDZ domain-binding motifs play a critical role in modulating cellular responses during hMPV infection.
- The identified proteomic alterations provide a deeper understanding of hMPV pathogenesis.
- These findings support the evaluation of M2-2 mutants as potential vaccine candidates against hMPV.
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