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Siderophore-dependent ferrichelatases.

C E Merrick1, N M Gulati1, T A Wencewicz1

  • 1Department of Chemistry, Washington University in St. Louis, St. Louis, MO, United States.

Methods in Enzymology
|August 18, 2024
PubMed
Summary
This summary is machine-generated.

Bacteria use siderophores to scavenge iron, but new research shows their binding proteins may actively shuttle iron. This ferrichelatase activity challenges traditional models of bacterial iron transport and warrants further investigation across siderophore binding proteins.

Keywords:
Ferrichelatase ironFerrioxamineMembrane transportSiderophore

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Bacteria require iron for proliferation, but host defenses limit its availability during infection.
  • Siderophores are bacterial chelators that bind ferric iron for uptake via specific receptors.
  • Traditional models of siderophore-receptor interaction do not fully explain iron transport dynamics.

Purpose of the Study:

  • To investigate the functional characterization of siderophore binding proteins (SBPs).
  • To develop methodologies for assaying ferrichelatase activity in SBPs.
  • To determine if ferrichelatase activity is a common feature of SBPs.

Main Methods:

  • General functional characterization protocols for SBPs.
  • Assay development for ferrichelatase activity.
  • Investigating iron transfer from holo-transferrin to siderophores via SBPs.

Main Results:

  • Demonstrated that Staphylococcus aureus SBP FhuD2 exhibits ferrichelatase activity.
  • Showed FhuD2 can transfer iron from holo-transferrin to a siderophore.
  • Challenged canonical protein-ligand binding models for SBP function.

Conclusions:

  • Ferrichelatase activity represents a novel mechanism in receptor-mediated active transport.
  • The role of SBPs in iron transport may involve active iron shuttling.
  • Further research is needed to determine the prevalence of ferrichelatase activity in SBPs.