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Fluorescence protein complementation in microscopy: applications beyond detecting bi-molecular interactions.

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|November 21, 2018
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Certain fluorescent protein fragments, like GFP1-10 and GFP11, spontaneously complement, enabling novel applications in protein biology and live imaging. These self-associating fragments offer unique advantages over traditional bimolecular fluorescence complementation (BiFC) techniques.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microscopy

Background:

  • Traditional bimolecular fluorescence complementation (BiFC) relies on protein proximity to form fluorescent species.
  • Conventional BiFC uses protein fragments that only emit light when interacting proteins bring them together.

Purpose of the Study:

  • To highlight the utility of spontaneously complementing fluorescent protein fragments.
  • To encourage further development and application of these self-associating fragments.

Main Methods:

  • Review of literature on fluorescent protein fragment complementation.
  • Focus on superfolder green fluorescent protein (GFP) derived fragments (GFP1-10 and GFP11).

Main Results:

  • Certain fluorescent protein fragments, specifically GFP1-10 and GFP11, exhibit spontaneous complementation.
  • These fragments serve as effective folding reporters for high-throughput expression and structural biology.
  • Self-associating fragments are valuable for live imaging, including labeling specific synapses and visualizing protein topology.

Conclusions:

  • Spontaneously complementing fluorescent protein fragments offer unique advantages for live imaging and protein studies.
  • The GFP11 tag is particularly useful when full-length fluorescent proteins hinder protein function or imaging.
  • These tools have broad potential in live imaging of pathogens and understanding subcellular protein localization.