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Novel metal-binding proteins by design

M Klemba1, K H Gardner, S Marino

  • 1Department of Molecular Biophysics & Biochemistry Yale University, New Haven, Connecticut 06520, USA.

Nature Structural Biology
|May 1, 1995
PubMed
Summary
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Researchers designed a novel zinc-binding site in a small protein, maintaining its structure. The engineered protein binds zinc ions with high affinity and tetrahedral coordination.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Engineering

Background:

  • The B1 domain of Streptococcal protein G is a well-characterized small protein.
  • Introducing metal-binding sites into proteins can alter their function and stability.
  • Designing specific metal coordination environments is crucial for bioinorganic chemistry applications.

Purpose of the Study:

  • To engineer a novel tetrahedral histidine-cysteine (His3Cys) zinc(II)-binding site into the B1 domain of Streptococcal protein G.
  • To characterize the biophysical properties of the engineered protein variants.
  • To confirm the structural integrity of the B1 domain upon metal site incorporation.

Main Methods:

  • Protein engineering to introduce the His3Cys metal-binding site.

Related Experiment Videos

  • Spectroscopic characterization including optical absorption, circular dichroism (CD), and nuclear magnetic resonance (NMR) spectroscopy.
  • Zinc(II) titration experiments to assess binding affinity.

    • Main Results:

    • Successful design and expression of B1 domain variants with a functional His3Cys Zn(II)-binding site.
    • Spectroscopic data confirmed high-affinity binding of Zn(II) to the engineered site.
    • NMR and CD spectroscopy indicated that the overall secondary and tertiary structure of the B1 domain was preserved.
    • The Zn(II) ions adopted a tetrahedral coordination geometry within the designed site.

    Conclusions:

    • A novel tetrahedral His3Cys Zn(II)-binding site can be successfully engineered into the B1 domain of Streptococcal protein G.
    • The engineered protein binds Zn(II) with high affinity while maintaining the protein's native structure.
    • This work provides a foundation for designing metalloproteins with tailored functions.