5LZP

Binding of the C-terminal GQYL motif of the bacterial proteasome activator Bpa to the 20S proteasome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Structural Analysis of the Bacterial Proteasome Activator Bpa in Complex with the 20S Proteasome.

Bolten, M.Delley, C.L.Leibundgut, M.Boehringer, D.Ban, N.Weber-Ban, E.

(2016) Structure 24: 2138-2151

  • DOI: 10.1016/j.str.2016.10.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mycobacterium tuberculosis harbors proteasomes that recruit substrates for degradation through an ubiquitin-like modification pathway. Recently, a non-ATPase activator termed Bpa (bacterial proteasome activator) was shown to support an alternate prot ...

    Mycobacterium tuberculosis harbors proteasomes that recruit substrates for degradation through an ubiquitin-like modification pathway. Recently, a non-ATPase activator termed Bpa (bacterial proteasome activator) was shown to support an alternate proteasomal degradation pathway. Here, we present the cryo-electron microscopy (cryo-EM) structure of Bpa in complex with the 20S core particle (CP). For docking into the cryo-EM density, we solved the X-ray structure of Bpa, showing that it forms tight four-helix bundles arranged into a 12-membered ring with a 40 Å wide central pore and the C-terminal helix of each protomer protruding from the ring. The Bpa model was fitted into the cryo-EM map of the Bpa-CP complex, revealing its architecture and striking symmetry mismatch. The Bpa-CP interface was resolved to 3.5 Å, showing the interactions between the C-terminal GQYL motif of Bpa and the proteasome α-rings. This docking mode is related to the one observed for eukaryotic activators with features specific to the bacterial complex.


    Organizational Affiliation

    ETH Zurich, Institute of Molecular Biology & Biophysics, 8093 Zurich, Switzerland.,ETH Zurich, Institute of Molecular Biology & Biophysics, 8093 Zurich, Switzerland. Electronic address: eilika@mol.biol.ethz.ch.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proteasome subunit alpha
0, 2, 4, 6, 8, B, D, H, J, M, Q, S, W, Y
241Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: prcA
EC: 3.4.25.1
Find proteins for P9WHU1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WHU1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Bacterial proteasome activator
1, 3, 5, 7, V, X, Z
180Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: bpa
Find proteins for P9WKX3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WKX3
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Proteasome subunit beta
A, C, E, F, G, I, K, L, N, O, P, R, T, U
242Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: prcB
EC: 3.4.25.1
Find proteins for P9WHT9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WHT9
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2016-12-14
    Type: Database references
  • Version 1.2: 2017-07-26
    Type: Experimental preparation
  • Version 1.3: 2017-08-02
    Type: Data collection
  • Version 1.4: 2018-10-17
    Type: Data collection, Refinement description
  • Version 1.5: 2019-10-23
    Type: Data collection, Other