Use of hybridization for distance measurement by fluorescence energy transfer in oligomeric proteins: distance between two functional sites in aspartase.

Abstract excerpt

Our previous studies suggested that in a tetrameric enzyme aspartase, Cys-140 and Trp-430 are located at or near the catalytic and activator sites, respectively. To estimate the distance between these two sites, fluorescence energy transfer between a single tryptophan (Trp-430) and a fluorescent group specifically attached to Cys-140 has been measured. From the fluorescence spectra of the enzyme, the distance was...

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