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Salmonella YqiC exerts its function through an oligomeric state
Wei-Chun Huang1, Wai-Ting Chen1, Yueh-Chen Chen1
1Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
Protein Science : a Publication of the Protein Society
|August 9, 2023
Summary
Salmonella Typhimurium
Area of Science:
- Microbiology
- Protein Biochemistry
- Bacterial Pathogenesis
Background:
- Protein oligomerization influences biological function.
- The YqiC protein in Salmonella Typhimurium forms a homotrimer and is linked to bacterial colonization and invasion.
- Understanding YqiC's oligomeric state is crucial for elucidating its role in infection.
Purpose of the Study:
- To investigate the significance of YqiC protein oligomerization in Salmonella Typhimurium pathogenesis.
- To identify YqiC's interaction partners and their role in bacterial virulence.
Main Methods:
- Site-directed mutagenesis of YqiC's coiled-coil domain.
- Confirmation of trimer loss using chemical crosslinking and SEC-MALS.
- Complementation of yqiC-knockout strains with wild-type and mutant YqiC.
- Protein-protein interaction studies using pull-down assays and mass spectrometry.
Main Results:
- Mutating key residues disrupted YqiC homotrimer formation.
- Mutant YqiC failed to restore Salmonella colonization and invasion in knockout strains.
- YqiC interacts with electron transport chain Complex II subunits (SdhA, SdhB) and F0F1-ATP synthase β-subunit.
- Identified interactions suggest YqiC modulates bacterial energy metabolism and virulence factor assembly.
Conclusions:
- YqiC oligomerization is essential for Salmonella Typhimurium virulence.
- YqiC's interaction with metabolic enzymes impacts bacterial pathogenesis.
- YqiC represents a potential therapeutic target for combating Salmonella infections.
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