Protein precursor to functional NEDD8 which is ideal for the characterization of NEDD8-specific processing proteases. The ubiquitin-like protein Nedd8 is conjugated to targets by the NEDD8- specific E1 activating enzyme (AppBp1/Uba3) the Ubch12 E2 enzyme, and the ROC1/Rbx1 RING finger ligase. NEDD8 plays a critical regulatory role in cell proliferation and development, and modifies nearly all members of the cullin family.