MUB1-RAD6-UBR2 ubiquitin ligase complex / RAD6-UBR2 ubiquitin ligase complex / Rad6-Rad18 complex / regulation of dipeptide transport / UBR1-RAD6 ubiquitin ligase complex / sno(s)RNA transcription / HULC complex / proteasome regulatory particle binding / error-free postreplication DNA repair / meiotic DNA double-strand break formation ...MUB1-RAD6-UBR2 ubiquitin ligase complex / RAD6-UBR2 ubiquitin ligase complex / Rad6-Rad18 complex / regulation of dipeptide transport / UBR1-RAD6 ubiquitin ligase complex / sno(s)RNA transcription / HULC complex / proteasome regulatory particle binding / error-free postreplication DNA repair / meiotic DNA double-strand break formation / ubiquitin-dependent protein catabolic process via the N-end rule pathway / stress-induced homeostatically regulated protein degradation pathway / Synthesis of active ubiquitin: roles of E1 and E2 enzymes / mitochondria-associated ubiquitin-dependent protein catabolic process / cytoplasm protein quality control by the ubiquitin-proteasome system / E3 ubiquitin ligases ubiquitinate target proteins / telomere maintenance via recombination / proteasome regulatory particle, base subcomplex / ribosome-associated ubiquitin-dependent protein catabolic process / error-free translesion synthesis / E2 ubiquitin-conjugating enzyme / sporulation resulting in formation of a cellular spore / proteasome binding / ubiquitin conjugating enzyme activity / Antigen processing: Ubiquitination & Proteasome degradation / Maturation of protein E / protein monoubiquitination / Maturation of protein E / cellular response to unfolded protein / ER Quality Control Compartment (ERQC) / Myoclonic epilepsy of Lafora / ubiquitin ligase complex / FLT3 signaling by CBL mutants / Prevention of phagosomal-lysosomal fusion / IRAK2 mediated activation of TAK1 complex / Alpha-protein kinase 1 signaling pathway / error-prone translesion synthesis / Glycogen synthesis / IRAK1 recruits IKK complex / IRAK1 recruits IKK complex upon TLR7/8 or 9 stimulation / Membrane binding and targetting of GAG proteins / Endosomal Sorting Complex Required For Transport (ESCRT) / Regulation of TBK1, IKKε (IKBKE)-mediated activation of IRF3, IRF7 / Negative regulation of FLT3 / PTK6 Regulates RTKs and Their Effectors AKT1 and DOK1 / Regulation of TBK1, IKKε-mediated activation of IRF3, IRF7 upon TLR3 ligation / Constitutive Signaling by NOTCH1 HD Domain Mutants / IRAK2 mediated activation of TAK1 complex upon TLR7/8 or 9 stimulation / NOTCH2 Activation and Transmission of Signal to the Nucleus / TICAM1,TRAF6-dependent induction of TAK1 complex / subtelomeric heterochromatin formation / TICAM1-dependent activation of IRF3/IRF7 / APC/C:Cdc20 mediated degradation of Cyclin B / Regulation of FZD by ubiquitination / Downregulation of ERBB4 signaling / p75NTR recruits signalling complexes / APC-Cdc20 mediated degradation of Nek2A / InlA-mediated entry of Listeria monocytogenes into host cells / Regulation of pyruvate metabolism / TRAF6-mediated induction of TAK1 complex within TLR4 complex / TRAF6 mediated IRF7 activation in TLR7/8 or 9 signaling / Regulation of innate immune responses to cytosolic DNA / NF-kB is activated and signals survival / Downregulation of ERBB2:ERBB3 signaling / NRIF signals cell death from the nucleus / Pexophagy / VLDLR internalisation and degradation / Regulation of PTEN localization / Activated NOTCH1 Transmits Signal to the Nucleus / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / Translesion synthesis by REV1 / Synthesis of active ubiquitin: roles of E1 and E2 enzymes / InlB-mediated entry of Listeria monocytogenes into host cell / Translesion synthesis by POLK / Activation of IRF3, IRF7 mediated by TBK1, IKKε (IKBKE) / Downregulation of TGF-beta receptor signaling / Josephin domain DUBs / TICAM1, RIP1-mediated IKK complex recruitment / ERAD pathway / JNK (c-Jun kinases) phosphorylation and activation mediated by activated human TAK1 / Translesion synthesis by POLI / mitotic G1 DNA damage checkpoint signaling / Gap-filling DNA repair synthesis and ligation in GG-NER / IKK complex recruitment mediated by RIP1 / TGF-beta receptor signaling in EMT (epithelial to mesenchymal transition) / Regulation of activated PAK-2p34 by proteasome mediated degradation / TNFR1-induced NF-kappa-B signaling pathway / PINK1-PRKN Mediated Mitophagy / TCF dependent signaling in response to WNT / Autodegradation of Cdh1 by Cdh1:APC/C / N-glycan trimming in the ER and Calnexin/Calreticulin cycle / APC/C:Cdc20 mediated degradation of Securin / activated TAK1 mediates p38 MAPK activation / Regulation of NF-kappa B signaling / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / Regulation of signaling by CBL / NIK-->noncanonical NF-kB signaling / NOTCH3 Activation and Transmission of Signal to the Nucleus Similarity search - Function
Journal: Nature / Year: 2021 Title: Structural insights into Ubr1-mediated N-degron polyubiquitination. Authors: Man Pan / Qingyun Zheng / Tian Wang / Lujun Liang / Junxiong Mao / Chong Zuo / Ruichao Ding / Huasong Ai / Yuan Xie / Dong Si / Yuanyuan Yu / Lei Liu / Minglei Zhao / Abstract: The N-degron pathway targets proteins that bear a destabilizing residue at the N terminus for proteasome-dependent degradation. In yeast, Ubr1-a single-subunit E3 ligase-is responsible for the Arg/N- ...The N-degron pathway targets proteins that bear a destabilizing residue at the N terminus for proteasome-dependent degradation. In yeast, Ubr1-a single-subunit E3 ligase-is responsible for the Arg/N-degron pathway. How Ubr1 mediates the initiation of ubiquitination and the elongation of the ubiquitin chain in a linkage-specific manner through a single E2 ubiquitin-conjugating enzyme (Ubc2) remains unknown. Here we developed chemical strategies to mimic the reaction intermediates of the first and second ubiquitin transfer steps, and determined the cryo-electron microscopy structures of Ubr1 in complex with Ubc2, ubiquitin and two N-degron peptides, representing the initiation and elongation steps of ubiquitination. Key structural elements, including a Ubc2-binding region and an acceptor ubiquitin-binding loop on Ubr1, were identified and characterized. These structures provide mechanistic insights into the initiation and elongation of ubiquitination catalysed by Ubr1.
History
Deposition
Apr 8, 2021
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Header (metadata) release
Nov 24, 2021
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Map release
Nov 24, 2021
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Update
May 29, 2024
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Current status
May 29, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
EMPIAR-10886 (Title: Single-particle cryoEM data of yeast Ubr1-Ubc2-Ub-N-degron complex (initiation) Data size: 5.7 TB Data #1: Unaligned movie data of yeast Ubr1-Ubc2-Ub-N-degron complex (initiation complex) [micrographs - multiframe])
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