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Related Experiment Videos

Proton pathways in green fluorescence protein.

Noam Agmon1

  • 1Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel. agmon@fh.huji.ac.il

Biophysical Journal
|February 1, 2005
PubMed
Summary

Green fluorescent protein (GFP) has extended proton pathways, suggesting it acts as a light-driven proton pump. This pump facilitates proton emission and replenishment, impacting its fluorescence mechanism.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Protein Engineering

Background:

  • Green fluorescent protein (GFP) is a widely used bioluminescent reporter.
  • Understanding proton transfer mechanisms is crucial for protein function and engineering.

Purpose of the Study:

  • To elucidate the detailed proton pathways within wild-type green fluorescent protein (GFP).
  • To investigate the potential of GFP as a light-driven proton pump.

Main Methods:

  • Analysis of X-ray diffraction data of wild-type GFP.
  • Structural characterization of proton entry and exit pathways.

Main Results:

  • Identified an extended two-step proton exit pathway from the active site, regulated by a threonine switch.
  • Discovered a proton entry pathway originating from a glutamate-lysine cluster (Glu-5) to Glu-222 near the active site.

Conclusions:

  • Structural data supports GFP functioning as a portable light-driven proton pump.
  • Proton emission occurs in the excited state via the exit pathway, with replenishment in the ground state from the entry pathway.

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