Abstract
Neural precursor cell expressed, developmentally down-regulated gene 8 (NEDD8) is a recently discovered ubiquitin-like posttranslational modifier. NEDD8 acts predominantly as a regulator of ubiquitin–protein ligases and as a decoy for proteins targeted for proteasomal degradation. It thereby controls key events in cell cycle progression and embryogenesis. Deneddylase-1 (DEN1/NEDP1/SENP8) features a selective peptidase activity converting the proNEDD8 precursor to its mature form and an isopeptidase activity deconjugating NEDD8 from substrates such as cullins and p53. In this study, we describe a high-throughput screening (HTS)-compatible time-resolved fluorescent resonance energy transfer (TR–FRET) assay measuring the peptidase activity of DEN1.
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