Red fluorescent protein from Discosoma as a fusion tag and a partner for fluorescence resonance energy transfer

Biochemistry
H MizunoA Miyawaki

Abstract

The biochemical and biophysical properties of a red fluorescent protein from a Discosoma species (DsRed) were investigated. The recombinant DsRed expressed in E. coli showed a complex absorption spectrum that peaked at 277, 335, 487, 530, and 558 nm. Excitation at each of the absorption peaks produced a main emission peak at 583 nm, whereas a subsidiary emission peak at 500 nm appeared with excitation only at 277 or 487 nm. Incubation of E. coli or the protein at 37 degrees C facilitated the maturation of DsRed, resulting in the loss of the 500-nm peak and the enhancement of the 583-nm peak. In contrast, the 500-nm peak predominated in a mutant DsRed containing two amino acid substitutions (Y120H/K168R). Light-scattering analysis revealed that DsRed proteins expressed in E. coli and HeLa cells form a stable tetramer complex. DsRed in HeLa cells grown at 37 degrees C emitted predominantly at 583 nm. The red fluorescence was imaged using a two-photon laser (Nd:YLF, 1047 nm) as well as a one-photon laser (He:Ne, 543.5 nm). When fused to calmodulin, the red fluorescence produced an aggregation pattern only in the cytosol, which does not reflect the distribution of calmodulin. Despite the above spectral and structural complexity, fl...Continue Reading

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