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Green Fluorescent Protein (GFP) as a Wavelength Shifter

1990
  • Osamu Shimomura
  • Martin Chalfie
  • Roger Y. Tsien
Esperimento di laboratorio con la proteina verde fluorescente nella ricerca biochimica.

(Immagine generata a solo scopo illustrativo)

In some organisms like the jellyfish Aequorea victoria, the initial bioluminescent reaction produces blue light. This energy is then transferred to a secondary protein, the Green Fluorescent Protein (GFP), via Förster resonance energy transfer (FRET). GFP absorbs the blue light and re-emits it as green light, effectively shifting the color of the luminescence.

The discovery and application of GFP revolutionized cell biology. Osamu Shimomura first isolated GFP from *Aequorea victoria* in the 1960s while studying the bioluminescent photoprotein aequorin. Aequorin emits blue light upon binding with Ca²⁺ ions. Shimomura noticed the jellyfish glowed green, not blue, leading him to discover the energy transfer to GFP. The key feature of GFP is its chromophore, formed autocatalytically from a Ser-Tyr-Gly sequence within the protein’s primary structure. This chromophore is shielded within a beta-barrel structure, protecting it from the environment and enabling its bright fluorescence.

Martin Chalfie ha successivamente dimostrato che il gene per la GFP potrebbe essere espresso in altri organismi (*E. coli* e *C. elegans*), dove funzionerebbe come marcatore fluorescente senza bisogno di cofattori specie-specifici.

UNESCO Nomenclature: 2401
- Biochimica

Tipo

Molecola biologica

Interruzione

Incremental

Utilizzo

Uso diffuso

Precursori

  • discovery of bioluminescenza in aequorea victoria
  • understanding of protein structure and function
  • sviluppo di DNA ricombinante tecnologia
  • discovery of Förster resonance energy transfer (FRET)

Applicazioni

  • gene reporter in biologia molecolare per visualizzare l'espressione genica
  • tagging proteins to study their location and movement within cells
  • calcium imaging (with variants like gcamp)
  • high-throughput screening in drug discovery
  • creating transgenic glowing pets (e.g., glofish)

Brevetti:

  • US5491084A
  • US6146826A

Idee e potenziali innovazioni

  • gfp-based sensors that change color in the presence of specific pollutants
  • whole-body imaging in preclinical research using near-infrared fluorescent proteins
  • fluorescent tattoos that can monitor blood glucose or other metabolites
  • gfp-tagged viruses to track the spread of infection in real-time
  • artistic and architectural materials incorporating fluorescent proteins
  • educational kits for students to learn about gene expression using glowing bacteria
  • cellular-level “barcodes” using different fluorescent proteins to track individual cells in a population
  • optogenetic tools where gfp is fused to light-sensitive proteins to control cellular activity
  • fluorescent silk produced by transgenic silkworms for novel textiles
  • biosensors for detecting explosives or chemical warfare agents
Correlato a: GFP, proteina fluorescente verde, Aequorea victoria, fluorescenza, FRET, gene reporter, marcatura proteica, cromoforo, Osamu Shimomura, Roger Tsien.

Contesto storico

Green Fluorescent Protein (GFP) as a Wavelength Shifter

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(se la data è sconosciuta o non rilevante, ad esempio "meccanica dei fluidi", viene fornita una stima approssimativa della sua notevole comparsa)

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