5LFJ

Crystal Structure of the Bacterial Proteasome Activator Bpa of Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 

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This is version 1.1 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:  
    5LFJ, 5LFP, 5LFQ, 5LZP

  • 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 proteasomal degradation pathway ...

    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. Electronic address: eilika@mol.biol.ethz.ch.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bacterial proteasome activatorA, B, C, D125Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: bpaRv3780MTCY13D12.14
UniProt
Find proteins for P9WKX3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WKX3 
Go to UniProtKB:  P9WKX3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WKX3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.378α = 90
b = 101.378β = 90
c = 311.246γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2016-12-14
    Changes: Database references