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Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates
Published on: May 30, 2017
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Vibrio cholerae FeoA, FeoB, and FeoC Interact To Form a Complex.
Begoña Stevenson1, Elizabeth E Wyckoff1, Shelley M Payne2
1Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA.
Journal of Bacteriology
|February 3, 2016
Summary
The ferrous iron transport (Feo) system in Vibrio cholerae involves FeoA, FeoB, and FeoC proteins. This study reveals they form a large complex, with FeoA essential for assembly, suggesting this complex is the active iron transport form.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- The Feo system is the primary ferrous iron uptake mechanism in prokaryotes.
- Despite its importance, the structure and transport mechanism of Feo remain largely unknown.
- The feo operon in Vibrio cholerae encodes three essential proteins: FeoA, FeoB, and FeoC.
Purpose of the Study:
- To investigate the in vivo interactions of Vibrio cholerae Feo proteins (FeoA, FeoB, FeoC).
- To determine the role of FeoA and FeoC in the assembly of the Feo complex.
- To identify key residues in FeoB involved in complex formation and system function.
Main Methods:
- In vivo cross-linking of full-length FeoB in Vibrio cholerae.
- Analysis of higher-order FeoB complexes using biochemical techniques.
- Site-directed mutagenesis to identify critical amino acid residues in FeoB's GTPase domain.
Main Results:
- Full-length FeoB forms higher-order complexes in vivo.
- FeoB simultaneously associates with both FeoA and FeoC to create a large complex.
- FeoA, but not FeoC, is essential for the assembly of this Feo complex.
- Specific residues in FeoB's GTPase domain are critical for both complex formation and Feo system function.
Conclusions:
- The Feo system likely functions as a large multi-protein complex, not just the FeoB permease alone.
- FeoA plays a crucial role in mediating the assembly of the Feo complex.
- The identified FeoB residues are vital for ferrous iron transport and complex integrity.
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