Development of a bioluminescence resonance energy transfer (BRET) for monitoring estrogen receptor alpha activation

Elisa Michelini; Mara Mirasoli; Matti Karp; Marko Virta; Aldo Roda

doi:10.1117/12.529246

14 June 2004 Development of a bioluminescence resonance energy transfer (BRET) for monitoring estrogen receptor alpha activation

Elisa Michelini, Mara Mirasoli, Matti Karp, Marko Virta, Aldo Roda

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Proceedings Volume 5329, Genetically Engineered and Optical Probes for Biomedical Applications II; (2004) https://doi.org/10.1117/12.529246
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

Abstract

Estrogen receptor (ER) is a ligand-activated transcriptional factor, able to dimerize after activation and to bind specific DNA sequences (estrogen response elements), thus activating gene target transcription. Since ER homo- and hetero-dimerization (giving a-a and a-b isoforms) is a fundamental step for receptor activation, we developed an assay for detecting compounds that induce human ERa homo-dimerization based on bioluminescence resonance energy transfer (BRET). BRET is a non-radiative energy transfer, occurring between a luminescent donor and a fluorescent acceptor, that strictly depends on the closeness between the two proteins and can therefore be used for studying protein-protein interactions. We cloned ERa coding sequence in frame with either a variant of the green fluorescent protein (enhanced yellow fluorescent protein, EYFP) or Renilla luciferase (RLuc). Upon ERa homo-dimerization, BRET process takes place in the presence of the RLuc substrate coelenterazine resulting in EYFP emission at its characteristic wavelength. The ER alpha-Rluc and ER alpha-EYFP fusion proteins were cloned, then the occurrence of BRET in the presence of ER alpha activators was assayed both in vivo, within cells, and in vitro, with purified fusion proteins.

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Elisa Michelini, Mara Mirasoli, Matti Karp, Marko Virta, and Aldo Roda "Development of a bioluminescence resonance energy transfer (BRET) for monitoring estrogen receptor alpha activation", Proc. SPIE 5329, Genetically Engineered and Optical Probes for Biomedical Applications II, (14 June 2004); https://doi.org/10.1117/12.529246

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KEYWORDS

Receptors

Proteins

Resonance energy transfer

Bioluminescence

Luminescence

Energy transfer

Green fluorescent protein

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