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Related Experiment Videos

Polypeptide-metal cluster connectivities in Cd(II) GAL4.

P L Gadhavi1, A L Davis, J F Povey

  • 1Department of Biochemistry, University of Cambridge, UK.

FEBS Letters
|April 9, 1991
PubMed
Summary

This study used NMR to map connections in Cd(II) GAL4, revealing a two-metal ion cluster. Cysteine residues 11 and 28 were identified as bridging ligands in this protein-metal complex.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • The GAL4 protein is a transcriptional activator that binds to upstream activating sequences.
  • Metal ions, particularly zinc, are crucial for the structure and function of GAL4.
  • Understanding the coordination environment of metal ions in GAL4 is essential for elucidating its mechanism of action.

Purpose of the Study:

  • To determine the polypeptide/metal cluster connectivities in Cadmium(II)-substituted GAL4 (Cd(II) GAL4).
  • To identify the specific amino acid residues involved in coordinating the metal ions within the GAL4 protein.

Main Methods:

  • Two-dimensional 1H-113Cd correlation Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
  • This technique allowed for the direct observation of interactions between protons in the polypeptide and the 113Cadmium nucleus.

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Main Results:

  • The NMR data confirmed the presence of a two-metal ion cluster within the Cd(II) GAL4 protein.
  • Cysteine residues at positions 11 (Cys-11) and 28 (Cys-28) were identified as the bridging ligands connecting the two metal ions.

Conclusions:

  • The study elucidates the specific coordination environment of Cadmium ions in GAL4.
  • Cys-11 and Cys-28 play a critical role in forming the binuclear metal cluster, influencing the protein's structure and potentially its function.