heterochromatin boundary formation / protein K29-linked ubiquitination / cytoplasm protein quality control by the ubiquitin-proteasome system / nuclear protein quality control by the ubiquitin-proteasome system / protein branched polyubiquitination / HECT-type E3 ubiquitin transferase / cytoplasm protein quality control / protein K11-linked ubiquitination / ubiquitin-ubiquitin ligase activity / DNA repair-dependent chromatin remodeling ...heterochromatin boundary formation / protein K29-linked ubiquitination / cytoplasm protein quality control by the ubiquitin-proteasome system / nuclear protein quality control by the ubiquitin-proteasome system / protein branched polyubiquitination / HECT-type E3 ubiquitin transferase / cytoplasm protein quality control / protein K11-linked ubiquitination / ubiquitin-ubiquitin ligase activity / DNA repair-dependent chromatin remodeling / protein K48-linked ubiquitination / progesterone receptor signaling pathway / ubiquitin binding / negative regulation of smoothened signaling pathway / positive regulation of protein import into nucleus / protein polyubiquitination / ubiquitin protein ligase activity / positive regulation of canonical Wnt signaling pathway / proteasome-mediated ubiquitin-dependent protein catabolic process / DNA repair / DNA damage response / positive regulation of gene expression / chromatin / perinuclear region of cytoplasm / protein-containing complex / RNA binding / zinc ion binding / nucleoplasm / nucleus / membrane / cytosol / cytoplasm 類似検索 - 分子機能
E3 ubiquitin ligase EDD, ubiquitin-associated domain / : / E3 ubiquitin ligase EDD / Poly(A)-binding protein C-terminal (PABC) domain profile. / C-terminal domain of Poly(A)-binding protein. Present also in Drosophila hyperplastics discs protein. / Polyadenylate-binding protein/Hyperplastic disc protein / PABC (PABP) domain / MLLE domain / Zinc finger, UBR-type / Zinc finger UBR-type profile. ...E3 ubiquitin ligase EDD, ubiquitin-associated domain / : / E3 ubiquitin ligase EDD / Poly(A)-binding protein C-terminal (PABC) domain profile. / C-terminal domain of Poly(A)-binding protein. Present also in Drosophila hyperplastics discs protein. / Polyadenylate-binding protein/Hyperplastic disc protein / PABC (PABP) domain / MLLE domain / Zinc finger, UBR-type / Zinc finger UBR-type profile. / Putative zinc finger in N-recognin, a recognition component of the N-end rule pathway / Regulator of chromosome condensation 1/beta-lactamase-inhibitor protein II / HECT domain / HECT, E3 ligase catalytic domain / HECT-domain (ubiquitin-transferase) / HECT domain profile. / Domain Homologous to E6-AP Carboxyl Terminus with 類似検索 - ドメイン・相同性
ジャーナル: Nat Chem Biol / 年: 2024 タイトル: Structural snapshots along K48-linked ubiquitin chain formation by the HECT E3 UBR5. 著者: Laura A Hehl / Daniel Horn-Ghetko / J Rajan Prabu / Ronnald Vollrath / D Tung Vu / David A Pérez Berrocal / Monique P C Mulder / Gerbrand J van der Heden van Noort / Brenda A Schulman / 要旨: Ubiquitin (Ub) chain formation by homologous to E6AP C-terminus (HECT)-family E3 ligases regulates vast biology, yet the structural mechanisms remain unknown. We used chemistry and cryo-electron ...Ubiquitin (Ub) chain formation by homologous to E6AP C-terminus (HECT)-family E3 ligases regulates vast biology, yet the structural mechanisms remain unknown. We used chemistry and cryo-electron microscopy (cryo-EM) to visualize stable mimics of the intermediates along K48-linked Ub chain formation by the human E3, UBR5. The structural data reveal a ≈ 620 kDa UBR5 dimer as the functional unit, comprising a scaffold with flexibly tethered Ub-associated (UBA) domains, and elaborately arranged HECT domains. Chains are forged by a UBA domain capturing an acceptor Ub, with its K48 lured into the active site by numerous interactions between the acceptor Ub, manifold UBR5 elements and the donor Ub. The cryo-EM reconstructions allow defining conserved HECT domain conformations catalyzing Ub transfer from E2 to E3 and from E3. Our data show how a full-length E3, ubiquitins to be adjoined, E2 and intermediary products guide a feed-forward HECT domain conformational cycle establishing a highly efficient, broadly targeting, K48-linked Ub chain forging machine.