RCSB PDB - 3K9P: The crystal structure of E2-25K and ubiquitin complex (original) (raw)
Structural basis of E2-25K/UBB+1 interaction leading to proteasome inhibition and neurotoxicity
[Ko, S.](/search?q=citation.rcsb%5Fauthors:Ko, S.), [Kang, G.B.](/search?q=citation.rcsb%5Fauthors:Kang, G.B.), [Song, S.M.](/search?q=citation.rcsb%5Fauthors:Song, S.M.), [Lee, J.-G.](/search?q=citation.rcsb%5Fauthors:Lee, J.-G.), [Shin, D.Y.](/search?q=citation.rcsb%5Fauthors:Shin, D.Y.), [Yun, J.-H.](/search?q=citation.rcsb%5Fauthors:Yun, J.-H.), [Sheng, Y.](/search?q=citation.rcsb%5Fauthors:Sheng, Y.), [Cheong, C.](/search?q=citation.rcsb%5Fauthors:Cheong, C.), [Jeon, Y.H.](/search?q=citation.rcsb%5Fauthors:Jeon, Y.H.), [Jung, Y.-K.](/search?q=citation.rcsb%5Fauthors:Jung, Y.-K.), [Arrowsmith, C.H.](/search?q=citation.rcsb%5Fauthors:Arrowsmith, C.H.), [Avvakumov, G.V.](/search?q=citation.rcsb%5Fauthors:Avvakumov, G.V.), [Dhe-Paganon, S.](/search?q=citation.rcsb%5Fauthors:Dhe-Paganon, S.), [Yoo, Y.J.](/search?q=citation.rcsb%5Fauthors:Yoo, Y.J.), [Eom, S.H.](/search?q=citation.rcsb%5Fauthors:Eom, S.H.), [Lee, W.](/search?q=citation.rcsb%5Fauthors:Lee, W.)
(2010) J Biological Chem 285: 36070-36080
PubMed Abstract:
E2-25K/Hip2 is an unusual ubiquitin-conjugating enzyme that interacts with the frameshift mutant of ubiquitin B (UBB(+1)) and has been identified as a crucial factor regulating amyloid-β neurotoxicity. To study the structural basis of the neurotoxicity mediated by the E2-25K-UBB(+1) interaction, we determined the three-dimensional structures of UBB(+1), E2-25K and the E2-25K/ubiquitin, and E2-25K/UBB(+1) complex. The structures revealed that ubiquitin or UBB(+1) is bound to E2-25K via the enzyme MGF motif and residues in α9 of the enzyme. Polyubiquitylation assays together with analyses of various E2-25K mutants showed that disrupting UBB(+1) binding markedly diminishes synthesis of neurotoxic UBB(+1)-anchored polyubiquitin. These results suggest that the interaction between E2-25K and UBB(+1) is critical for the synthesis and accumulation of UBB(+1)-anchored polyubiquitin, which results in proteasomal inhibition and neuronal cell death.
Organizational Affiliation:
Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea.