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データを開く
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基本情報
| 登録情報 | ![]() | |||||||||
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| タイトル | Substrate-engaged human 26S proteasome bound to midnolin with RPT1 at top of spiral staircase | |||||||||
マップデータ | ||||||||||
試料 |
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キーワード | Midnolin / 26S proteasome / Complex / HYDROLASE | |||||||||
| 機能・相同性 | 機能・相同性情報negative regulation of glucokinase activity / thyrotropin-releasing hormone receptor binding / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / nuclear proteasome complex / host-mediated perturbation of viral transcription / positive regulation of inclusion body assembly / integrator complex / proteasome accessory complex / meiosis I ...negative regulation of glucokinase activity / thyrotropin-releasing hormone receptor binding / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / nuclear proteasome complex / host-mediated perturbation of viral transcription / positive regulation of inclusion body assembly / integrator complex / proteasome accessory complex / meiosis I / purine ribonucleoside triphosphate binding / proteasome regulatory particle / cytosolic proteasome complex / positive regulation of proteasomal protein catabolic process / proteasome-activating activity / Antigen processing: Ub, ATP-independent proteasomal degradation / proteasome regulatory particle, lid subcomplex / proteasome regulatory particle, base subcomplex / sperm glycocalyx / protein K63-linked deubiquitination / negative regulation of programmed cell death / metal-dependent deubiquitinase activity / Regulation of ornithine decarboxylase (ODC) / Proteasome assembly / proteasome core complex / perinuclear theca / Cross-presentation of soluble exogenous antigens (endosomes) / Somitogenesis / K63-linked deubiquitinase activity / transcription factor binding / Homologous DNA Pairing and Strand Exchange / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / Resolution of D-loop Structures through Holliday Junction Intermediates / proteasome binding / Impaired BRCA2 binding to RAD51 / myofibril / regulation of protein catabolic process / proteasome storage granule / proteasomal ubiquitin-independent protein catabolic process / sperm head-tail coupling apparatus / Presynaptic phase of homologous DNA pairing and strand exchange / general transcription initiation factor binding / protein deubiquitination / blastocyst development / polyubiquitin modification-dependent protein binding / immune system process / proteasome endopeptidase complex / NF-kappaB binding / proteasome core complex, beta-subunit complex / endopeptidase activator activity / threonine-type endopeptidase activity / proteasome assembly / mRNA export from nucleus / proteasome core complex, alpha-subunit complex / enzyme regulator activity / regulation of proteasomal protein catabolic process / inclusion body / ciliary tip / : / TBP-class protein binding / proteasome complex / stem cell differentiation / Regulation of activated PAK-2p34 by proteasome mediated degradation / sarcomere / Autodegradation of Cdh1 by Cdh1:APC/C / APC/C:Cdc20 mediated degradation of Securin / ubiquitin binding / N-glycan trimming in the ER and Calnexin/Calreticulin cycle / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / TNFR2 non-canonical NF-kB pathway / AUF1 (hnRNP D0) binds and destabilizes mRNA / centriole / sperm end piece / P-body / negative regulation of inflammatory response to antigenic stimulus / Assembly of the pre-replicative complex / Vpu mediated degradation of CD4 / Cdc20:Phospho-APC/C mediated degradation of Cyclin A / lipopolysaccharide binding / Degradation of DVL / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of CRY and PER proteins / Degradation of AXIN / Hh mutants are degraded by ERAD / Activation of NF-kappaB in B cells / G2/M Checkpoints / Hedgehog ligand biogenesis / Degradation of GLI1 by the proteasome / Defective CFTR causes cystic fibrosis / Autodegradation of the E3 ubiquitin ligase COP1 / Regulation of RUNX3 expression and activity / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / Hedgehog 'on' state 類似検索 - 分子機能 | |||||||||
| 生物種 | Homo sapiens (ヒト) | |||||||||
| 手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.75 Å | |||||||||
データ登録者 | Zhu C / Qin L / Liang L | |||||||||
| 資金援助 | 中国, 1件
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引用 | ジャーナル: Nat Commun / 年: 2026タイトル: Structural dynamics of the midnolin-proteasome during ubiquitin-independent substrate turnover. 著者: Chuanda Zhu / Lu Qin / Zonglin Dai / Peng Zuo / Ao Yang / Lijun Zhong / Zhiqiang Lin / Ling Liang / ![]() 要旨: The 26S proteasome typically degrades proteins marked by ubiquitin chains. However, a distinct, ubiquitin-independent degradation pathway for nuclear proteins exists, mediated by the adaptor protein ...The 26S proteasome typically degrades proteins marked by ubiquitin chains. However, a distinct, ubiquitin-independent degradation pathway for nuclear proteins exists, mediated by the adaptor protein midnolin, yet its molecular mechanism remains poorly understood. Here, we present nine cryo-electron microscopy structures of the human 26S proteasome in complex with midnolin, which collectively delineate a near-complete catalytic cycle. Our structures reveal that midnolin binds to the proteasome via the RPN1 subunit by its C-terminal helix. Unexpectedly, its ubiquitin-like domain interacts with the RPN11 deubiquitinase in a non-catalytic role. This interaction positions the adjacent Catch domain, which is responsible for substrate binding, directly above the proteasomal entrance, potentially facilitating substrate entry into the proteasome. Furthermore, we observe four consecutive spiral staircase conformations of the AAA+ ATPase hexamer during substrate translocation. These findings provide insights into the mechanisms underlying ubiquitin-independent nuclear protein degradation and may help develop strategies for targeting nuclear proteins via direct proteasomal degradation. | |||||||||
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構造の表示
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ダウンロードとリンク
-EMDBアーカイブ
| マップデータ | emd_63776.map.gz | 743 MB | EMDBマップデータ形式 | |
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| ヘッダ (付随情報) | emd-63776-v30.xml emd-63776.xml | 67.8 KB 67.8 KB | 表示 表示 | EMDBヘッダ |
| 画像 | emd_63776.png | 53.2 KB | ||
| Filedesc metadata | emd-63776.cif.gz | 15.4 KB | ||
| アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-63776 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-63776 | HTTPS FTP |
-関連構造データ
| 関連構造データ | ![]() 9mbpMC ![]() 22mmC ![]() 9mboC ![]() 9mbqC ![]() 9u3lC ![]() 9u4mC ![]() 9u7rC ![]() 9w39C ![]() 9wbgC C: 同じ文献を引用 ( M: このマップから作成された原子モデル |
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| 類似構造データ | 類似検索 - 機能・相同性 F&H 検索 |
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リンク
| EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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| 「今月の分子」の関連する項目 |
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マップ
| ファイル | ダウンロード / ファイル: emd_63776.map.gz / 形式: CCP4 / 大きさ: 824 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| 投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
| ボクセルのサイズ | X=Y=Z: 0.85 Å | ||||||||||||||||||||||||||||||||||||
| 密度 |
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| 対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
| 詳細 | EMDB XML:
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-添付データ
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試料の構成要素
+全体 : 26S proteasome complexed with midnolin
+超分子 #1: 26S proteasome complexed with midnolin
+超分子 #2: midnolin
+超分子 #3: 26S proteasome
+分子 #1: 26S proteasome non-ATPase regulatory subunit 1
+分子 #2: 26S proteasome non-ATPase regulatory subunit 3
+分子 #3: 26S proteasome non-ATPase regulatory subunit 12
+分子 #4: 26S proteasome non-ATPase regulatory subunit 11
+分子 #5: 26S proteasome non-ATPase regulatory subunit 6
+分子 #6: 26S proteasome non-ATPase regulatory subunit 7
+分子 #7: 26S proteasome non-ATPase regulatory subunit 13
+分子 #8: 26S proteasome non-ATPase regulatory subunit 4
+分子 #9: 26S proteasome non-ATPase regulatory subunit 14
+分子 #10: 26S proteasome non-ATPase regulatory subunit 8
+分子 #11: 26S proteasome complex subunit SEM1
+分子 #12: 26S proteasome regulatory subunit 7
+分子 #13: 26S proteasome regulatory subunit 4
+分子 #14: 26S proteasome regulatory subunit 8
+分子 #15: 26S proteasome regulatory subunit 6B
+分子 #16: Proteasome 26S subunit, ATPase 6
+分子 #17: 26S proteasome regulatory subunit 6A
+分子 #18: substrate peptide
+分子 #19: Proteasome subunit alpha type-6
+分子 #20: Proteasome subunit alpha type-2
+分子 #21: Proteasome subunit alpha type-4
+分子 #22: Proteasome subunit alpha type-7
+分子 #23: Proteasome subunit alpha type-5
+分子 #24: Isoform Long of Proteasome subunit alpha type-1
+分子 #25: Proteasome subunit alpha type-3
+分子 #26: Proteasome subunit beta type-6
+分子 #27: Proteasome subunit beta type-7
+分子 #28: Proteasome subunit beta type-3
+分子 #29: Proteasome subunit beta type-2
+分子 #30: Proteasome subunit beta type-5
+分子 #31: Proteasome subunit beta type-1
+分子 #32: Proteasome subunit beta type-4
+分子 #33: Midnolin
+分子 #34: 26S proteasome non-ATPase regulatory subunit 2
+分子 #35: ZINC ION
+分子 #36: ADENOSINE-5'-TRIPHOSPHATE
+分子 #37: MAGNESIUM ION
+分子 #38: ADENOSINE-5'-DIPHOSPHATE
+分子 #39: N-[(benzyloxy)carbonyl]-L-leucyl-N-[(2S)-4-methyl-1-oxopentan-2-y...
-実験情報
-構造解析
| 手法 | クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
| 試料の集合状態 | particle |
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試料調製
| 緩衝液 | pH: 7.4 |
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| 凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
| 顕微鏡 | TFS KRIOS |
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| 撮影 | フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 平均電子線量: 40.0 e/Å2 |
| 電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
| 電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1.8 µm / 最小 デフォーカス(公称値): 1.2 µm |
| 実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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コントローラー
万見について




キーワード
Homo sapiens (ヒト)
データ登録者
中国, 1件
引用


































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解析
FIELD EMISSION GUN
