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- PDB-22mm: Structure of human 26S proteasome complexed with midnolin(1-111+3... -

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Basic information

Entry
Database: PDB / ID: 22mm
TitleStructure of human 26S proteasome complexed with midnolin(1-111+337-468)
Components
  • (26S proteasome non-ATPase regulatory subunit ...) x 10
  • (26S proteasome regulatory subunit ...) x 5
  • (Proteasome subunit alpha type- ...) x 7
  • (Proteasome subunit beta type- ...) x 7
  • 26S proteasome complex subunit SEM1
  • Isoform Long of Proteasome subunit alpha type-1
  • Midnolin,MCHERRY,fusion tag
  • Proteasome 26S subunit, ATPase 6
KeywordsHYDROLASE / 26S proteasome / midnolin
Function / homology
Function and homology information


negative regulation of glucokinase activity / positive regulation of inclusion body assembly / thyrotropin-releasing hormone receptor binding / nuclear proteasome complex / host-mediated perturbation of viral transcription / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / proteasome accessory complex / purine ribonucleoside triphosphate binding / integrator complex ...negative regulation of glucokinase activity / positive regulation of inclusion body assembly / thyrotropin-releasing hormone receptor binding / nuclear proteasome complex / host-mediated perturbation of viral transcription / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / proteasome accessory complex / purine ribonucleoside triphosphate binding / integrator complex / proteasome regulatory particle / cytosolic proteasome complex / positive regulation of proteasomal protein catabolic process / CD8-positive, alpha-beta T cell differentiation / CD8-positive, alpha-beta T cell homeostasis / transcription factor binding / thymic T cell selection / Antigen processing: Ub, ATP-independent proteasomal degradation / proteasome-activating activity / proteasome regulatory particle, lid subcomplex / proteasome regulatory particle, base subcomplex / negative regulation of programmed cell death / negative regulation of regulatory T cell differentiation / T-helper 1 cell differentiation / protein K63-linked deubiquitination / metal-dependent deubiquitinase activity / Regulation of ornithine decarboxylase (ODC) / proteasome core complex / Proteasome assembly / cellular response to type I interferon / T-helper 17 cell differentiation / Cross-presentation of soluble exogenous antigens (endosomes) / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / Somitogenesis / K63-linked deubiquitinase activity / 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) / flagellated sperm motility / Resolution of D-loop Structures through Holliday Junction Intermediates / sperm end piece / proteasome binding / myofibril / Impaired BRCA2 binding to RAD51 / ciliary tip / negative regulation of insulin secretion / proteasomal ubiquitin-independent protein catabolic process / general transcription initiation factor binding / proteasome storage granule / Presynaptic phase of homologous DNA pairing and strand exchange / proteasome endopeptidase complex / protein deubiquitination / NF-kappaB binding / proteasome core complex, beta-subunit complex / endopeptidase activator activity / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasome assembly / mRNA export from nucleus / immune system process / regulation of G1/S transition of mitotic cell cycle / regulation of macroautophagy / stem cell differentiation / positive regulation of interleukin-2 production / proteasome complex / enzyme regulator activity / response to type II interferon / inclusion body / TBP-class protein binding / : / regulation of proteasomal protein catabolic process / bioluminescence / sarcomere / Regulation of activated PAK-2p34 by proteasome mediated degradation / generation of precursor metabolites and energy / ubiquitin binding / negative regulation of inflammatory response to antigenic stimulus / Autodegradation of Cdh1 by Cdh1:APC/C / proteasomal protein catabolic process / APC/C:Cdc20 mediated degradation of Securin / N-glycan trimming in the ER and Calnexin/Calreticulin cycle / Asymmetric localization of PCP proteins / lipopolysaccharide binding / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / AUF1 (hnRNP D0) binds and destabilizes mRNA / TNFR2 non-canonical NF-kB pathway / positive regulation of type II interferon production / Assembly of the pre-replicative complex / P-body / Vpu mediated degradation of CD4 / Cdc20:Phospho-APC/C mediated degradation of Cyclin A / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of DVL / Degradation of AXIN / Degradation of CRY and PER proteins / meiotic cell cycle
Similarity search - Function
Midnolin / : / : / 26S proteasome regulatory subunit RPN7/PSMD6 C-terminal helix / PSMD3-like, N-terminal TPR repeats / 26S proteasome non-ATPase regulatory subunit Rpn12 / 26S proteasome regulatory subunit, C-terminal / Proteasome regulatory subunit C-terminal / 26S proteasome regulatory subunit RPN5, C-terminal domain / : ...Midnolin / : / : / 26S proteasome regulatory subunit RPN7/PSMD6 C-terminal helix / PSMD3-like, N-terminal TPR repeats / 26S proteasome non-ATPase regulatory subunit Rpn12 / 26S proteasome regulatory subunit, C-terminal / Proteasome regulatory subunit C-terminal / 26S proteasome regulatory subunit RPN5, C-terminal domain / : / 26S proteasome regulatory subunit RPN5 C-terminal domain / PSD13 N-terminal repeats / 26S proteasome regulatory subunit Rpn6, N-terminal / 6S proteasome subunit Rpn6, C-terminal helix domain / 26S proteasome regulatory subunit RPN6 N-terminal domain / 26S proteasome subunit RPN6 C-terminal helix domain / 26S Proteasome non-ATPase regulatory subunit 13 / 26S Proteasome non-ATPase regulatory subunit 7/8 / : / 26S proteasome subunit RPN2, N-terminal domain / 26S proteasome regulatory complex, non-ATPase subcomplex, Rpn2/Psmd1 subunit / 26S proteasome regulatory subunit RPN2, C-terminal / 26S proteasome regulatory subunit RPN2 C-terminal domain / : / 26S proteasome regulatory subunit RPN11 C-terminal domain / 26S proteasome regulatory complex, non-ATPase subcomplex, Rpn1 subunit / RPN1, N-terminal / 26S proteasome non-ATPase regulatory subunit RPN1, C-terminal / RPN1 N-terminal domain / 26S proteasome non-ATPase regulatory subunit RPN1 C-terminal / DSS1/SEM1 / DSS1/SEM1 family / DSS1_SEM1 / Proteasome/cyclosome repeat / Proteasome/cyclosome repeat / : / 26S proteasome regulatory subunit 7, OB domain / : / : / : / PSMD12/CSN4, N-terminal / 26S proteasome regulatory subunit Rpn7/COP9 signalosome complex subunit 1 / 26S proteasome regulatory subunit Rpn7, N-terminal / 26S proteasome subunit RPN7 / 26S Proteasome non-ATPase regulatory subunit 12/COP9 signalosome complex subunit 4 / : / PCI/PINT associated module / HEAT repeats / Proteasome subunit alpha 1 / Proteasomal ATPase OB C-terminal domain / Proteasomal ATPase OB C-terminal domain / CSN8/PSMD8/EIF3K / CSN8/PSMD8/EIF3K family / Rpn11/EIF3F, C-terminal / Maintenance of mitochondrial structure and function / motif in proteasome subunits, Int-6, Nip-1 and TRIP-15 / : / PCI domain / Proteasome component (PCI) domain / PCI domain profile. / JAB1/Mov34/MPN/PAD-1 ubiquitin protease / Proteasome beta subunit, C-terminal / Proteasome beta subunits C terminal / Proteasome subunit beta 4 / Proteasome subunit beta 2 / Proteasome beta 3 subunit / Proteasome subunit alpha5 / Proteasome subunit alpha6 / Proteasome beta-type subunits signature. / Peptidase T1A, proteasome beta-subunit / Proteasome beta-type subunit, conserved site / Proteasome subunit A N-terminal signature / Proteasome alpha-type subunits signature. / Proteasome alpha-subunit, N-terminal domain / Proteasome subunit A N-terminal signature Add an annotation / Proteasome B-type subunit / Proteasome beta-type subunit profile. / : / Proteasome alpha-type subunit / Proteasome alpha-type subunit profile. / Proteasome subunit / Proteasome, subunit alpha/beta / JAB/MPN domain / JAB1/MPN/MOV34 metalloenzyme domain / AAA ATPase, AAA+ lid domain / AAA+ lid domain / MPN domain / MPN domain profile. / ATPase, AAA-type, conserved site / AAA-protein family signature. / Green fluorescent protein, GFP / Nucleophile aminohydrolases, N-terminal / Green fluorescent protein-related / Green fluorescent protein / Green fluorescent protein / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / Armadillo-like helical / Ubiquitin family / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
N-[(BENZYLOXY)CARBONYL]-L-LEUCYL-N-[(2S)-4-METHYL-1-OXOPENTAN-2-YL]-L-LEUCINAMIDE / ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / Chem-LDZ / 26S proteasome regulatory subunit 10B / MCHERRY / 26S proteasome non-ATPase regulatory subunit 11 / 26S proteasome non-ATPase regulatory subunit 12 / Ubiquitin C-terminal hydrolase PSMD14 / Proteasome subunit alpha type-7 ...N-[(BENZYLOXY)CARBONYL]-L-LEUCYL-N-[(2S)-4-METHYL-1-OXOPENTAN-2-YL]-L-LEUCINAMIDE / ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / Chem-LDZ / 26S proteasome regulatory subunit 10B / MCHERRY / 26S proteasome non-ATPase regulatory subunit 11 / 26S proteasome non-ATPase regulatory subunit 12 / Ubiquitin C-terminal hydrolase PSMD14 / Proteasome subunit alpha type-7 / 26S proteasome non-ATPase regulatory subunit 3 / 26S proteasome regulatory subunit 6A / Proteasome subunit beta type-1 / Proteasome subunit alpha type-1 / Proteasome subunit alpha type-2 / Proteasome subunit alpha type-3 / Proteasome subunit alpha type-4 / Proteasome subunit alpha type-5 / Proteasome subunit beta type-4 / Proteasome subunit beta type-6 / Proteasome subunit beta type-5 / 26S proteasome regulatory subunit 7 / 26S proteasome regulatory subunit 6B / 26S proteasome non-ATPase regulatory subunit 8 / Proteasome subunit beta type-3 / Proteasome subunit beta type-2 / 26S proteasome non-ATPase regulatory subunit 7 / 26S proteasome complex subunit SEM1 / Proteasome subunit alpha type-6 / 26S proteasome regulatory subunit 4 / 26S proteasome regulatory subunit 8 / 26S proteasome non-ATPase regulatory subunit 2 / 26S proteasome non-ATPase regulatory subunit 6 / Midnolin / Proteasome subunit beta type-7 / 26S proteasome non-ATPase regulatory subunit 1 / 26S proteasome non-ATPase regulatory subunit 13
Similarity search - Component
Biological speciesHomo sapiens (human)
Escherichia coli str. K-12 substr. MG1655 (bacteria)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.42 Å
AuthorsLiang, L. / Zhu, C. / Qin, L.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32171224 China
CitationJournal: Nat Commun / Year: 2026
Title: Structural dynamics of the midnolin-proteasome during ubiquitin-independent substrate turnover.
Authors: Chuanda Zhu / Lu Qin / Zonglin Dai / Peng Zuo / Ao Yang / Lijun Zhong / Zhiqiang Lin / Ling Liang /
Abstract: 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.
History
DepositionJan 16, 2026Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Apr 1, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
U: 26S proteasome non-ATPase regulatory subunit 1
V: 26S proteasome non-ATPase regulatory subunit 3
W: 26S proteasome non-ATPase regulatory subunit 12
X: 26S proteasome non-ATPase regulatory subunit 11
Y: 26S proteasome non-ATPase regulatory subunit 6
Z: 26S proteasome non-ATPase regulatory subunit 7
a: 26S proteasome non-ATPase regulatory subunit 13
c: 26S proteasome non-ATPase regulatory subunit 14
d: 26S proteasome non-ATPase regulatory subunit 8
e: 26S proteasome complex subunit SEM1
A: 26S proteasome regulatory subunit 7
B: 26S proteasome regulatory subunit 4
C: 26S proteasome regulatory subunit 8
D: 26S proteasome regulatory subunit 6B
E: Proteasome 26S subunit, ATPase 6
F: 26S proteasome regulatory subunit 6A
G: Proteasome subunit alpha type-6
H: Proteasome subunit alpha type-2
I: Proteasome subunit alpha type-4
J: Proteasome subunit alpha type-7
K: Proteasome subunit alpha type-5
L: Isoform Long of Proteasome subunit alpha type-1
M: Proteasome subunit alpha type-3
N: Proteasome subunit beta type-6
O: Proteasome subunit beta type-7
P: Proteasome subunit beta type-3
Q: Proteasome subunit beta type-2
R: Proteasome subunit beta type-5
S: Proteasome subunit beta type-1
T: Proteasome subunit beta type-4
g: Proteasome subunit alpha type-6
h: Proteasome subunit alpha type-2
i: Proteasome subunit alpha type-4
j: Proteasome subunit alpha type-7
k: Proteasome subunit alpha type-5
l: Isoform Long of Proteasome subunit alpha type-1
m: Proteasome subunit alpha type-3
n: Proteasome subunit beta type-6
o: Proteasome subunit beta type-7
p: Proteasome subunit beta type-3
q: Proteasome subunit beta type-2
r: Proteasome subunit beta type-5
s: Proteasome subunit beta type-1
t: Proteasome subunit beta type-4
f: Midnolin,MCHERRY,fusion tag
u: 26S proteasome non-ATPase regulatory subunit 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,676,13564
Polymers1,670,21146
Non-polymers5,92418
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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26S proteasome non-ATPase regulatory subunit ... , 10 types, 10 molecules UVWXYZacdu

#1: Protein 26S proteasome non-ATPase regulatory subunit 1 / 26S proteasome regulatory subunit RPN2 / 26S proteasome regulatory subunit S1 / 26S proteasome subunit p112


Mass: 105958.234 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q99460
#2: Protein 26S proteasome non-ATPase regulatory subunit 3 / 26S proteasome regulatory subunit RPN3 / 26S proteasome regulatory subunit S3 / Proteasome subunit p58


Mass: 60935.297 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O43242
#3: Protein 26S proteasome non-ATPase regulatory subunit 12 / 26S proteasome regulatory subunit RPN5 / 26S proteasome regulatory subunit p55


Mass: 52979.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O00232
#4: Protein 26S proteasome non-ATPase regulatory subunit 11 / 26S proteasome regulatory subunit RPN6 / 26S proteasome regulatory subunit S9 / 26S proteasome ...26S proteasome regulatory subunit RPN6 / 26S proteasome regulatory subunit S9 / 26S proteasome regulatory subunit p44.5


Mass: 47526.688 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O00231
#5: Protein 26S proteasome non-ATPase regulatory subunit 6 / 26S proteasome regulatory subunit RPN7 / 26S proteasome regulatory subunit S10 / Breast cancer- ...26S proteasome regulatory subunit RPN7 / 26S proteasome regulatory subunit S10 / Breast cancer-associated protein SGA-113M / Phosphonoformate immuno-associated protein 4 / Proteasome regulatory particle subunit p44S10 / p42A


Mass: 45592.285 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15008
#6: Protein 26S proteasome non-ATPase regulatory subunit 7 / 26S proteasome regulatory subunit RPN8 / 26S proteasome regulatory subunit S12 / Mov34 protein ...26S proteasome regulatory subunit RPN8 / 26S proteasome regulatory subunit S12 / Mov34 protein homolog / Proteasome subunit p40


Mass: 37086.441 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P51665
#7: Protein 26S proteasome non-ATPase regulatory subunit 13 / 26S proteasome regulatory subunit RPN9 / 26S proteasome regulatory subunit S11 / 26S proteasome ...26S proteasome regulatory subunit RPN9 / 26S proteasome regulatory subunit S11 / 26S proteasome regulatory subunit p40.5


Mass: 42995.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9UNM6
#8: Protein 26S proteasome non-ATPase regulatory subunit 14 / 26S proteasome regulatory subunit RPN11 / 26S proteasome-associated PAD1 homolog 1


Mass: 34488.824 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: O00487, Hydrolases; Acting on peptide bonds (peptidases); Omega peptidases
#9: Protein 26S proteasome non-ATPase regulatory subunit 8 / 26S proteasome regulatory subunit RPN12 / 26S proteasome regulatory subunit S14 / p31


Mass: 39536.676 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P48556
#33: Protein 26S proteasome non-ATPase regulatory subunit 2 / 26S proteasome regulatory subunit RPN1 / 26S proteasome regulatory subunit S2 / 26S proteasome ...26S proteasome regulatory subunit RPN1 / 26S proteasome regulatory subunit S2 / 26S proteasome subunit p97 / Protein 55.11 / Tumor necrosis factor type 1 receptor-associated protein 2


Mass: 100313.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q13200

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Protein , 4 types, 5 molecules eELlf

#10: Protein 26S proteasome complex subunit SEM1 / 26S proteasome complex subunit DSS1 / Deleted in split hand/split foot protein 1 / Split hand/foot ...26S proteasome complex subunit DSS1 / Deleted in split hand/split foot protein 1 / Split hand/foot deleted protein 1 / Split hand/foot malformation type 1 protein


Mass: 8284.611 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P60896
#15: Protein Proteasome 26S subunit, ATPase 6 / 26S proteasome regulatory subunit 10B


Mass: 45867.027 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: A0A087X2I1
#22: Protein Isoform Long of Proteasome subunit alpha type-1 / 30 kDa prosomal protein / PROS-30 / Macropain subunit C2 / Multicatalytic endopeptidase complex ...30 kDa prosomal protein / PROS-30 / Macropain subunit C2 / Multicatalytic endopeptidase complex subunit C2 / Proteasome component C2 / Proteasome nu chain / Proteasome subunit alpha-6 / alpha-6


Mass: 30150.277 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P25786
#32: Protein Midnolin,MCHERRY,fusion tag / Midbrain nucleolar protein


Mass: 49195.016 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Midnolin-mCherry, midnolin(1-111+337-468)
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Escherichia coli str. K-12 substr. MG1655 (bacteria), (gene. exp.) synthetic construct (others)
Gene: MIDN, mCherry / Production host: Homo sapiens (human) / References: UniProt: Q504T8, UniProt: A0A4D6FVK6

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26S proteasome regulatory subunit ... , 5 types, 5 molecules ABCDF

#11: Protein 26S proteasome regulatory subunit 7 / 26S proteasome AAA-ATPase subunit RPT1 / Proteasome 26S subunit ATPase 2


Mass: 48700.805 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P35998
#12: Protein 26S proteasome regulatory subunit 4 / P26s4 / 26S proteasome AAA-ATPase subunit RPT2 / Proteasome 26S subunit ATPase 1


Mass: 49260.504 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62191
#13: Protein 26S proteasome regulatory subunit 8 / 26S proteasome AAA-ATPase subunit RPT6 / Proteasome 26S subunit ATPase 5 / Proteasome subunit p45 / ...26S proteasome AAA-ATPase subunit RPT6 / Proteasome 26S subunit ATPase 5 / Proteasome subunit p45 / Thyroid hormone receptor-interacting protein 1 / TRIP1 / p45/SUG


Mass: 44852.121 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62195
#14: Protein 26S proteasome regulatory subunit 6B / 26S proteasome AAA-ATPase subunit RPT3 / MB67-interacting protein / MIP224 / Proteasome 26S subunit ...26S proteasome AAA-ATPase subunit RPT3 / MB67-interacting protein / MIP224 / Proteasome 26S subunit ATPase 4 / Tat-binding protein 7 / TBP-7


Mass: 47426.141 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P43686
#16: Protein 26S proteasome regulatory subunit 6A / 26S proteasome AAA-ATPase subunit RPT5 / Proteasome 26S subunit ATPase 3 / Proteasome subunit P50 / ...26S proteasome AAA-ATPase subunit RPT5 / Proteasome 26S subunit ATPase 3 / Proteasome subunit P50 / Tat-binding protein 1 / TBP-1


Mass: 49266.457 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P17980

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Proteasome subunit alpha type- ... , 7 types, 12 molecules GgHhIiJKkMmj

#17: Protein Proteasome subunit alpha type-6 / 27 kDa prosomal protein / PROS-27 / p27K / Macropain iota chain / Multicatalytic endopeptidase ...27 kDa prosomal protein / PROS-27 / p27K / Macropain iota chain / Multicatalytic endopeptidase complex iota chain / Proteasome iota chain / Proteasome subunit alpha-1 / alpha-1


Mass: 27301.262 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P60900
#18: Protein Proteasome subunit alpha type-2 / Macropain subunit C3 / Multicatalytic endopeptidase complex subunit C3 / Proteasome component C3 / ...Macropain subunit C3 / Multicatalytic endopeptidase complex subunit C3 / Proteasome component C3 / Proteasome subunit alpha-2 / alpha-2


Mass: 25796.338 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P25787
#19: Protein Proteasome subunit alpha type-4 / Macropain subunit C9 / Multicatalytic endopeptidase complex subunit C9 / Proteasome component C9 / ...Macropain subunit C9 / Multicatalytic endopeptidase complex subunit C9 / Proteasome component C9 / Proteasome subunit L / Proteasome subunit alpha-3 / alpha-3


Mass: 29394.648 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P25789
#20: Protein Proteasome subunit alpha type-7 / Proteasome subunit RC6-1 / Proteasome subunit XAPC7 / Proteasome subunit alpha-4 / alpha-4


Mass: 27929.891 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O14818
#21: Protein Proteasome subunit alpha type-5 / Macropain zeta chain / Multicatalytic endopeptidase complex zeta chain / Proteasome subunit alpha-5 ...Macropain zeta chain / Multicatalytic endopeptidase complex zeta chain / Proteasome subunit alpha-5 / alpha-5 / Proteasome zeta chain


Mass: 26435.977 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P28066
#23: Protein Proteasome subunit alpha type-3 / Macropain subunit C8 / Multicatalytic endopeptidase complex subunit C8 / Proteasome component C8 / ...Macropain subunit C8 / Multicatalytic endopeptidase complex subunit C8 / Proteasome component C8 / Proteasome subunit alpha-7 / alpha-7


Mass: 28338.057 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P25788
#31: Protein Proteasome subunit alpha type-7 / Proteasome subunit RC6-1 / Proteasome subunit XAPC7 / Proteasome subunit alpha-4 / alpha-4


Mass: 27798.695 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O14818

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Proteasome subunit beta type- ... , 7 types, 14 molecules NnOoPpQqRrSsTt

#24: Protein Proteasome subunit beta type-6 / Macropain delta chain / Multicatalytic endopeptidase complex delta chain / Proteasome delta chain / ...Macropain delta chain / Multicatalytic endopeptidase complex delta chain / Proteasome delta chain / Proteasome subunit Y / Proteasome subunit beta-1 / beta-1


Mass: 25246.455 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: P28072, proteasome endopeptidase complex
#25: Protein Proteasome subunit beta type-7 / Macropain chain Z / Multicatalytic endopeptidase complex chain Z / Proteasome subunit Z / ...Macropain chain Z / Multicatalytic endopeptidase complex chain Z / Proteasome subunit Z / Proteasome subunit beta-2 / beta-2


Mass: 29869.223 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: Q99436, proteasome endopeptidase complex
#26: Protein Proteasome subunit beta type-3 / Proteasome chain 13 / Proteasome component C10-II / Proteasome subunit beta-3 / beta-3 / Proteasome ...Proteasome chain 13 / Proteasome component C10-II / Proteasome subunit beta-3 / beta-3 / Proteasome theta chain


Mass: 22841.701 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P49720
#27: Protein Proteasome subunit beta type-2 / Macropain subunit C7-I / Multicatalytic endopeptidase complex subunit C7-I / Proteasome component ...Macropain subunit C7-I / Multicatalytic endopeptidase complex subunit C7-I / Proteasome component C7-I / Proteasome subunit beta-4 / beta-4


Mass: 22864.277 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P49721
#28: Protein Proteasome subunit beta type-5 / Macropain epsilon chain / Multicatalytic endopeptidase complex epsilon chain / Proteasome chain 6 / ...Macropain epsilon chain / Multicatalytic endopeptidase complex epsilon chain / Proteasome chain 6 / Proteasome epsilon chain / Proteasome subunit MB1 / Proteasome subunit X / Proteasome subunit beta-5 / beta-5


Mass: 28379.053 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: P28074, proteasome endopeptidase complex
#29: Protein Proteasome subunit beta type-1 / Macropain subunit C5 / Multicatalytic endopeptidase complex subunit C5 / Proteasome component C5 / ...Macropain subunit C5 / Multicatalytic endopeptidase complex subunit C5 / Proteasome component C5 / Proteasome gamma chain / Proteasome subunit beta-6 / beta-6


Mass: 26391.201 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P20618
#30: Protein Proteasome subunit beta type-4 / 26 kDa prosomal protein / HsBPROS26 / PROS-26 / Macropain beta chain / Multicatalytic endopeptidase ...26 kDa prosomal protein / HsBPROS26 / PROS-26 / Macropain beta chain / Multicatalytic endopeptidase complex beta chain / Proteasome beta chain / Proteasome chain 3 / HsN3 / Proteasome subunit beta-7 / beta-7


Mass: 29099.986 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P28070

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Non-polymers , 5 types, 18 molecules

#34: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#35: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#36: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#37: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#38: Chemical
ChemComp-LDZ / N-[(benzyloxy)carbonyl]-L-leucyl-N-[(2S)-4-methyl-1-oxopentan-2-yl]-L-leucinamide


Type: Peptide-like / Class: Inhibitor / Mass: 475.621 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C26H41N3O5 / Feature type: SUBJECT OF INVESTIGATION
References: N-[(BENZYLOXY)CARBONYL]-L-LEUCYL-N-[(2S)-4-METHYL-1-OXOPENTAN-2-YL]-L-LEUCINAMIDE
Comment: inhibitor*YM

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: 26S proteasome complexed with midnolin delCatch / Type: COMPLEX / Entity ID: #1-#33 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 BIOCONTINUUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1Topazparticle selection
2PHENIX1.20.1_4487model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.42 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 17418 / Symmetry type: POINT
RefinementHighest resolution: 3.42 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.004105027
ELECTRON MICROSCOPYf_angle_d0.826142010
ELECTRON MICROSCOPYf_dihedral_angle_d6.2114473
ELECTRON MICROSCOPYf_chiral_restr0.04716109
ELECTRON MICROSCOPYf_plane_restr0.00618333

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