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Metal-induced conformational changes in transferrins

J G Grossmann1, M Neu, R W Evans

  • 1Molecular Biophysics Group, SERC Daresbury Laboratory, Warrington, Cheshire, U.K.

Journal of Molecular Biology
|February 5, 1993
PubMed
Summary
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Metal binding to transferrin causes a domain closure, crucial for receptor recognition. Different metal ions induce varying conformational changes, impacting this interaction.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Transferrins are key iron-binding proteins involved in metal transport.
  • Iron binding to transferrin induces a significant conformational change, known as domain closure.
  • This domain closure is hypothesized to be essential for transferrin receptor recognition.

Purpose of the Study:

  • To investigate the structural changes in transferrin upon binding various metal ions.
  • To determine if metal-induced domain closure is specific to iron or occurs with other metals.
  • To correlate these conformational changes with potential receptor binding mechanisms.

Main Methods:

  • Small angle X-ray scattering (SAXS) was employed to study transferrin in solution.
  • SAXS data provided direct structural information on conformational dynamics.

Related Experiment Videos

  • The effects of different metal ions (Fe3+, In3+, Cu2+, Al3+, Hf4+) on transferrin structure were analyzed.

    • Main Results:

    • Fe3+, In3+, and Cu2+ induced a significant domain closure in transferrin, similar to previously observed changes with iron.
    • Al3+ caused a conformational change of a smaller magnitude.
    • Hf4+ did not induce any significant conformational change in transferrin.

    Conclusions:

    • The domain closure of transferrin upon metal binding is not exclusive to iron but is induced by other trivalent and divalent metal ions.
    • The magnitude of conformational change varies depending on the bound metal ion.
    • These findings support the hypothesis that metal-induced domain closure is a critical factor in the molecular recognition of metal-loaded transferrin by its receptor.