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A novel protein-mineral interface.

Dmitriy Alexeev1, Haizhong Zhu, Maolin Guo

  • 1Institute of Cell and Molecular Biology, Michael Swann Building, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JR, UK.

Nature Structural Biology
|February 25, 2003
PubMed
Summary
This summary is machine-generated.

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Researchers discovered a protein that binds to metal clusters, not just single metal ions. This finding reveals a new mechanism for how organisms might acquire metals from their environment.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Geochemistry

Background:

  • Transferrins are proteins that typically bind single metal ions, like Fe3+.
  • Many metals in the environment exist as multi-nuclear oxo-metal clusters.
  • The function of transferrin-like proteins in binding metal clusters is largely unknown.

Purpose of the Study:

  • To investigate if transferrin superfamily proteins can bind multi-nuclear oxo-metal clusters.
  • To determine the structural basis for protein-metal cluster interactions.

Main Methods:

  • Utilized the ferric ion-binding protein (nFbp) from Neisseria gonorrhoeae.
  • Performed binding assays with various metal clusters (Fe3+, Ti4+, Zr4+, Hf4+).
  • Determined the crystal structure of Hf-nFbp complex at 1.7 Å resolution.

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Main Results:

  • nFbp readily binds multi-nuclear oxo-metal clusters of Fe3+, Ti4+, Zr4+, and Hf4+.
  • The crystal structure revealed three distinct cluster types bound in a positively charged cleft.
  • A di-tyrosyl motif nucleates binding to trinuclear or pentanuclear oxo-Hf clusters, with phosphate capping.

Conclusions:

  • This study provides the first evidence of a transferrin superfamily member binding multi-nuclear metal clusters.
  • The high-resolution structure reveals a novel protein-mineral interface.
  • This work suggests a new metal uptake mechanism and models protein-mediated mineralization in geochemical processes.