FlAsH Labeling of A Nuclear Receptor Domain (D Domain of Ultraspiracle) Fused to Tetracysteine Tag

Abstract

Biarsenical fluorescein compounds feature unique fluorescence characteristics and special binding mechanism to tetracysteine tags with certain structures and these dyes offer a feasible method for site specific labeling of heterologously expressed proteins. We aimed FlAsH fluorescent labeling of tetracysteine fused hinge region of the ultraspiracle from Drosophila melanogaster (DmUSP-D domain) to facilitate functional studies of this receptor domain. A CCPGCC tetracysteine motif was integrated between His6, Gateway attB1, and Flag tags and attached to the N-terminus of the DmUSP-D. The fusion protein was expressed in Esherichia coli and the FlAsH labeling was performed in bacterial extracts, under conditions which are compatible with receptor function. The dye was bound to the tetracysteine tag with high affinity and complex stability and the labeling proved to be specific for the target fusion protein. Results indicate that FlAsH labeling of the internal CCPGCC motif can be a valuable tool for the functional characterisation of any nuclear receptor domains.

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Correspondence to M. Szécsi.

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Szécsi, M., Spindler-Barth, M. FlAsH Labeling of A Nuclear Receptor Domain (D Domain of Ultraspiracle) Fused to Tetracysteine Tag. BIOLOGIA FUTURA 57, 181–190 (2006). https://doi.org/10.1556/ABiol.57.2006.2.5

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Keywords

  • Fluorescent dyes
  • site specific labeling
  • recombinant fusion proteins