Ubiquitin-activating enzyme E1PDB ID: 1R4N
Several enzymes are needed to recognize obsolete proteins and add ubiquitin to them. This enzyme is similar to E1, the enzyme that activates ubiquitin.
The structure of the APPBP1-UBA3-NEDD8-ATP complex reveals the basis for selective ubiquitin-like protein activation by an E1.
Walden, H., Podgorski, M.S., Huang, D.T., Miller, D.W., Howard, R.J., Minor, D.L., Holton, J.M., Schulman, B.A.
Journal: (2003) Mol.Cell 12: 1427-1437