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Engineering 'Golden' Fluorescence by Selective Pressure Incorporation of Non-canonical Amino Acids and Protein Analysis by Mass Spectrometry and Fluorescence
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Structural evidence for an enolate intermediate in GFP fluorophore biosynthesis.

David P Barondeau1, John A Tainer, Elizabeth D Getzoff

  • 1Department of Molecular Biology, The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|March 9, 2006
PubMed
Summary

Researchers discovered a new enolate intermediate in green fluorescent protein (GFP) biosynthesis. This finding helps understand fluorophore formation and could lead to improved fluorescent proteins for biotechnology.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • The Aequorea victoria green fluorescent protein (GFP) forms a fluorophore via post-translational modification of amino acids Ser65, Tyr66, and Gly67.
  • This process involves spontaneous cyclization, dehydration, and oxidation reactions within the protein structure.

Purpose of the Study:

  • To elucidate the mechanism of fluorophore biosynthesis in GFP.
  • To identify and characterize intermediates in the GFP maturation pathway.
  • To investigate the role of the protein environment in stabilizing reaction intermediates.

Main Methods:

  • Coupling chemical reduction (dithionite) with anaerobic techniques.
  • Kinetic analyses to determine reaction rates.
  • High-resolution protein structure determination (X-ray crystallography).

Main Results:

  • Two high-resolution structures of dithionite-treated GFP variants revealed a novel enolate intermediate of the chromophore.
  • This enolate intermediate is stable under anaerobic conditions and can form the fluorophore upon exposure to air (t1/2 = 39 min-1).
  • The GFP protein environment stabilizes this high-energy enolate intermediate, mimicking enzymatic systems.

Conclusions:

  • The isolation of the enolate intermediate allows for specific probing of the rate-limiting oxidation step in GFP fluorophore biosynthesis.
  • Understanding this mechanism can guide the design of faster-maturing fluorescent proteins for biotechnology and cell biology.
  • The study highlights how protein structures can stabilize reactive intermediates to facilitate complex chemical modifications.