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• W2002389726 abstract "The ultraspiracle protein (Usp), together with an ecdysone receptor (EcR) forms a heterodimeric ecdysteroid receptor complex, which controls metamorphosis in Drosophila melanogaster. Although the ecdysteroid receptor is considered to be a source of elements for ecdysteroid inducible gene switches in mammals, nothing is known about posttranslational modifications of the receptor constituents in mammalian cells. Up until now there has been no study about Usp sumoylation. Using Ubc9 fusion-directed sumoylation system, we identified Usp as a new target of SUMO1 and SUMO3 modification. Mutagenesis studies on the fragments of Usp indicated that sumoylation can occur alternatively on several defined Lys residues, i.e. three (Lys16, Lys20, Lys37) in A/B region, one (Lys424) in E region and one (Lys506) in F region. However, sumoylation of one Lys residue within A/B region prevents modification of other residues in this region. This was also observed for Lys residues in carboxyl-terminal fragment of Usp, i.e. comprising E and F regions. Mass spectrometry analysis of the full-length Usp indicated that the main SUMO attachment site is at Lys20. EcR, the heterodimerization partner of Usp, and muristerone A, the EcR ligand, do not influence sumoylation patterns of Usp. Another heterodimerization partner of Usp - HR38 fused with Ubc9 interacts with Usp in HEK293 cells and allows sumoylation of Usp independent of the direct fusion to Ubc9. Taken together, we propose that sumoylation of DmUsp can be an important factor in modulating its activity by changing molecular interactions." @default.
• W2002389726 created "2016-06-24" @default.
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• W2002389726 date "2012-11-01" @default.
• W2002389726 modified "2023-10-18" @default.
• W2002389726 title "Alternative sumoylation sites in the Drosophila nuclear receptor Usp" @default.
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• W2002389726 doi "https://doi.org/10.1016/j.jsbmb.2012.05.011" @default.
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