alpha-ring from the proteasome from archaeoglobus fulgidus

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Investigations on the Maturation and Regulation of Archaebacterial Proteasomes

Groll, M.Brandstetter, H.Bartunik, H.Bourenkow, G.Huber, R.

(2003) J Mol Biol 327: 75-83

  • DOI: https://doi.org/10.1016/s0022-2836(03)00080-9
  • Primary Citation of Related Structures:  
    1J2P, 1J2Q

  • PubMed Abstract: 

    The 20S proteasome (core particle, CP) is a multifunctional protease complex and composed of four heptameric subunit rings arranged in a hollow, barrel-shaped structure. Here, we report the crystal structure of the CP from Archaeoglobus fulgidus at 2.25A resolution. The analysis of the structure of early and late assembly intermediates of this CP gives new insights in the maturation of archaebacterial CPs and indicates similarities to assembly intermediates observed in eukaryotes. We also show a striking difference in mechanism and regulation of substrate access between eukaryotic and archaebacterial 20S proteasomes. While eukaryotic CPs are auto-inhibited by the N-terminal tails of the outer alpha-ring by imposing topological closure with a characteristic sequence motif (YDR-motif) and show regulatory gating this segment is disordered in the CP and differently structured in the alpha(7)-sub-complex of A.fulgidus leaving a pore leading into the particle with a diameter of 13A. Mutagenesis and functional studies indicate the absence of regulatory gating in the archaeal 20S proteasome.

  • Organizational Affiliation

    Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Planegg-Martinsried, Germany. groll@biochem.mpg.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome alpha subunit
A, B, C, D, E
A, B, C, D, E, F, G
246Archaeoglobus fulgidusMutation(s): 0 
Find proteins for O29760 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O29760 
Go to UniProtKB:  O29760
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO29760
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 193.755α = 90
b = 214.226β = 90
c = 43.963γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references
  • Version 1.4: 2024-04-03
    Changes: Refinement description