Fusion of Aequorea victoria GFP and aequorin provides their Ca(2+)-induced interaction that results in red shift of GFP absorption and efficient bioluminescence energy transfer

Biochemical and Biophysical Research Communications
Andrey Yu GorokhovatskyYuli B Alakhov

Abstract

The bioluminescence emitted by Aequorea victoria jellyfish is greenish while its single bioluminescent photoprotein aequorin emits blue light. This phenomenon may be explained by a bioluminescence resonance energy transfer (BRET) from aequorin chromophore to green fluorescent protein (GFP) co-localized with it. However, a slight overlapping of the aequorin bioluminescence spectrum with the GFP absorption spectrum and the absence of marked interaction between these proteins in vitro pose a question on the mechanism providing the efficient BRET in A. victoria. Here we report the in vitro study of BRET between homologous Ca(2+)-activated photoproteins, aequorin or obelin (Obelia longissima), as bioluminescence energy donors, and GFP, as an acceptor. The fusions containing donor and acceptor proteins linked by a 19 aa peptide were purified after expressing their genes in Escherichia coli cells. It was shown that the GFP-aequorin fusion has a significantly greater BRET efficiency, compared to the GFP-obelin fusion. Two main factors responsible for the difference in BRET efficiency of these fusions were revealed. First, it is the presence of Ca(2+)-induced interaction between the donor and acceptor in the aequorin-containing fusion a...Continue Reading

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