Protein ubiquitination: CHIPping away the symmetry.
CHIP is a ubiquitin ligase implicated in the degradation of misfolded proteins. In the November 23 issue of Molecular Cell, identified CHIP as a protein that interacts with the ubiquitin E2 complex Ubc13-Uev1A, which catalyzes the synthesis of Lys-63-linked polyubiquitin chains. Although the ubiquitin ligase activity of CHIP requires its dimerization through the U box domain, the crystal structure of the CHIP-E2 complex reveals that the protomers in the CHIP homodimer adopt distinct conformations such that only one U box of CHIP interacts with Ubc13.
Schulman
Brenda A
BA
Howard Hughes Medical Institute, St. Jude Children's Research Hospital, 332 North Lauderdale Street, Memphis, Tennessee 38105, USA.
Chen
Zhijian J
ZJ
D002384:Catalysis; D019281:Dimerization; D006801:Humans; D011487:Protein Conformation; D025801:Ubiquitin / Q000378:metabolism*; D044763:Ubiquitin-Conjugating Enzymes / Q000378:metabolism; D043743:Ubiquitin-Protein Ligase Complexes / Q000378:metabolism*; D044767:Ubiquitin-Protein Ligases / Q000737:chemistry / Q000378:metabolism*
D025801:Ubiquitin; D044763:Ubiquitin-Conjugating Enzymes; D043743:Ubiquitin-Protein Ligase Complexes; C467728:STUB1 protein, human; D044767:Ubiquitin-Protein Ligases