6WJN image
Entry Detail
PDB ID:
6WJN
EMDB ID:
Title:
SD-like state of human 26S Proteasome with non-cleavable M1-linked hexaubiquitin and E3 ubiquitin ligase E6AP/UBE3A
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2020-04-14
Release Date:
2020-08-05
Method Details:
Experimental Method:
Resolution:
5.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 7
Chain IDs:NA (auth: A)
Chain Length:399
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 4
Chain IDs:OA (auth: B)
Chain Length:191
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 8
Chain IDs:PA (auth: C)
Chain Length:392
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 6B
Chain IDs:QA (auth: D)
Chain Length:257
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 10B
Chain IDs:RA (auth: E)
Chain Length:375
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome regulatory subunit 6A
Chain IDs:SA (auth: F)
Chain Length:396
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-6
Chain IDs:L (auth: G), Z (auth: g)
Chain Length:240
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-2
Chain IDs:M (auth: H), AA (auth: h)
Chain Length:232
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-4
Chain IDs:N (auth: I), BA (auth: i)
Chain Length:250
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-7
Chain IDs:O (auth: J), CA (auth: j)
Chain Length:243
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-5
Chain IDs:P (auth: K), DA (auth: k)
Chain Length:234
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-1
Chain IDs:Q (auth: L), EA (auth: l)
Chain Length:238
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit alpha type-3
Chain IDs:R (auth: M), FA (auth: m)
Chain Length:245
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-6
Chain IDs:S (auth: N), GA (auth: n)
Chain Length:191
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-7
Chain IDs:T (auth: O), HA (auth: o)
Chain Length:220
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-3
Chain IDs:U (auth: P), IA (auth: p)
Chain Length:204
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-2
Chain IDs:V (auth: Q), JA (auth: q)
Chain Length:199
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-5
Chain IDs:W (auth: R), KA (auth: r)
Chain Length:201
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-1
Chain IDs:X (auth: S), LA (auth: s)
Chain Length:213
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Proteasome subunit beta type-4
Chain IDs:Y (auth: T), MA (auth: t)
Chain Length:215
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 1
Chain IDs:A (auth: U)
Chain Length:911
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 3
Chain IDs:B (auth: V)
Chain Length:480
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 12
Chain IDs:C (auth: W)
Chain Length:456
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 11
Chain IDs:D (auth: X)
Chain Length:380
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 6
Chain IDs:E (auth: Y)
Chain Length:378
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 7
Chain IDs:F (auth: Z)
Chain Length:286
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 13
Chain IDs:G (auth: a)
Chain Length:399
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 4
Chain IDs:H (auth: b)
Chain Length:191
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 14
Chain IDs:I (auth: c)
Chain Length:392
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 8
Chain IDs:J (auth: d)
Chain Length:257
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome complex subunit SEM1
Chain IDs:K (auth: e)
Chain Length:375
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:26S proteasome non-ATPase regulatory subunit 2
Chain IDs:TA (auth: f)
Chain Length:396
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Cryo-EM Reveals Unanchored M1-Ubiquitin Chain Binding at hRpn11 of the 26S Proteasome.
Structure 28 1206 1217.e4 (2020)
PMID: 32783951 DOI: 10.1016/j.str.2020.07.011

Abstact

The 26S proteasome is specialized for regulated protein degradation and formed by a dynamic regulatory particle (RP) that caps a hollow cylindrical core particle (CP) where substrates are proteolyzed. Its diverse substrates unify as proteasome targets by ubiquitination. We used cryogenic electron microscopy (cryo-EM) to study how human 26S proteasome interacts with M1-linked hexaubiquitin (M1-Ub6) unanchored to a substrate and E3 ubiquitin ligase E6AP/UBE3A. Proteasome structures are available with model substrates extending through the RP ATPase ring and substrate-conjugated K63-linked ubiquitin chains present at inhibited deubiquitinating enzyme hRpn11 and the nearby ATPase hRpt4/hRpt5 coiled coil. In this study, we find M1-Ub6 at the hRpn11 site despite the absence of conjugated substrate, indicating that ubiquitin binding at this location does not require substrate interaction with the RP. Moreover, unanchored M1-Ub6 binds to this hRpn11 site of the proteasome with the CP gating residues in both the closed and opened conformational states.

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Primary Citation of related structures