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Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects

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Published on: February 18, 2014

Structural Analysis and Inhibitor Modeling of Bacterioferritin From Brucella abortus.

Lijun Liu^1,2, Elizabeth K Harmon^2,3, Justin K Craig^2,3

¹Protein Structure and X-Ray Crystallography Laboratory, Del Shankel Structural Biology Center, University of Kansas, Kansas, USA.

|January 2, 2026

Summary

Bacterioferritins (Bfr) store iron in bacteria, with iron release facilitated by ferredoxin (Bfd). This study presents crystal structures of Bfr and models of Bfr:Bfd complexes, offering insights into potential drug targets.

Keywords:

bacterioferritin brucellosis inhibitor binding iron transport pathogens protein complex

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Area of Science:

Microbiology
Structural Biology
Biochemistry

Background:

Bacterioferritins (Bfr) are crucial for bacterial iron homeostasis, storing Fe3+ and releasing Fe2+ for metabolic needs.
Bfr forms a 24-meric spherical structure, with iron release facilitated by ferredoxin (Bfd) binding to its surface.
Understanding the Bfr:Bfd interaction is vital for developing novel antibacterial strategies.

Purpose of the Study:

To determine the crystal structures of Brucella abortus bacterioferritin (BaBfr) in apo and iron-bound states.
To model the Bfr:Bfd complexes for Brucella abortus (Ba) and Acinetobacter baumannii (Ab) and compare them with Pseudomonas aeruginosa (Pa).
To investigate potential inhibitory mechanisms by docking known Bfr:Bfd inhibitors to Ba and Ab structures.

Main Methods:

X-ray crystallography was used to obtain the crystal structures of BaBfr.
Molecular modeling was employed to generate models of BaBfr:Bfd and AbBfr:Bfd complexes.
Molecular docking was performed using compounds known to inhibit the Bfr:Bfd interaction in Pa.

Main Results:

Crystal structures of apo and iron-bound BaBfr were determined and compared with Ab and Pa Bfr.
Models of BaBfr:Bfd and AbBfr:Bfd complexes were generated and analyzed in comparison to PaBfr:Bfd.
Docking studies provided insights into the binding modes and potential inhibitory mechanisms of compounds targeting the Bfr:Bfd interaction.

Conclusions:

The structural and modeling data provide a foundation for understanding bacterial iron storage and release mechanisms.
The study highlights the potential of targeting the Bfr:Bfd interaction as a strategy for antibacterial drug development.
Comparative analysis across different bacterial species offers insights into conserved and variable features of the Bfr:Bfd complex.