Green Fluorescent Protein (GFP)


Green fluorescent protein (GFP), a fluorescent molecule, found in the jellyfish Aequorea victoria, was the first of a diverse family of fluorescent proteins cloned from marine invertebrates. Fluorescent proteins are useful reporter molecules for in vitro and whole organism gene expression studies and for tracking subcellular localisation of proteins in living cells. Because they fold robustly in nearly all biological systems studied and require no cofactors for development of fluorescence, fluorescent proteins have become ubiquitous tools in a broad range of cell biology subdisciplines. Colour variants covering the entire visible spectrum have been engineered from various wild‐type fluorescent proteins, allowing the simultaneous imaging of multiple proteins within the same cell, as well as advanced applications such as biochemical activity reporters. Additional engineering has produced variants that change colour upon illumination or whose fluorescence can be switched on and off, making them useful for other advanced imaging techniques.

Key Concepts:

  • The green fluorescent protein from Aequorea victoria was the first intrinsically fluorescent protein to be discovered.

  • A diverse family of fluorescent proteins has been cloned from a wide variety of marine invertebrates including jellyfish, corals, copepods and lancelets.

  • Fluorescent proteins are highly useful reporter genes in a wide variety of biological systems.

  • Fluorescent proteins have been the subject of heavy engineering efforts to improve their physical and optical properties as genetically encoded tools.

  • Colour variants of fluorescent proteins allow multicolour protein tracking in living cells.

  • Advanced uses for fluorescent proteins include optical sensing of important signalling molecules such as calcium and biochemical activities such as kinase activation.

  • Photoactivatable and photoswitchable fluorescent proteins can be used for ‘superresolution’ imaging of cellular structures below the optical diffraction limit.

Keywords: fluorescence; fluorescent proteins; reporter gene; coral; microscopy

Figure 1.

Purified fluorescent proteins illuminated by UV light. Proteins pictured are variants of Aequorea victoria GFP and Discosoma sp. DsRed. Photograph © Nathan C. Shaner.

Figure 2.

Structure of Aequorea victoria green fluorescent protein.

Figure 3.

(a) Excitation and (b) emission spectra of EBFP2, mTurquoise, EGFP, mNeonGreen, Venus, mOrange and mCherry.

Figure 4.

HeLa cells expressing ECFP localised to the endoplasmic reticulum (ER) and EYFP localised to the Golgi apparatus. Images were taken with CCD imaging, then pseudocoloured and superimposed.

Figure 5.

Transgenic mice expressing GFP. Photograph © Dr Masaru Okabe.



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Further Reading

Chalfie M and Kain S (eds) (2006) Green Fluorescent Protein: Properties, Applications, and Protocols, 2nd edn. New York, NY: Wiley‐Liss.

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Shaner NC, Patterson GH and Davidson MW (2007) Advances in fluorescent protein technology. Journal of Cell Science 120(Pt 24): 4247–4260.

Sullivan K and Kay SA (eds) (1999) GFP biofluorescence: imaging gene expression and protein dynamics in living cells. Methods in Cell Biology, vol. 58. San Diego, CA: Academic Press.

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How to Cite close
Shaner, Nathan C(Oct 2014) Green Fluorescent Protein (GFP). In: eLS. John Wiley & Sons Ltd, Chichester. [doi: 10.1002/9780470015902.a0002663.pub3]