2Z5E

Crystal Structure of Proteasome Assembling Chaperone 3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.184 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of a chaperone complex that contributes to the assembly of yeast 20S proteasomes

Yashiroda, H.Mizushima, T.Okamoto, K.Kameyama, T.Hayashi, H.Kishimoto, T.Niwa, S.Kasahara, M.Kurimoto, E.Sakata, E.Takagi, K.Suzuki, A.Hirano, Y.Murata, S.Kato, K.Yamane, T.Tanaka, K.

(2008) Nat Struct Mol Biol 15: 228-236

  • DOI: 10.1038/nsmb.1386
  • Primary Citation of Related Structures:  
    2Z5B, 2Z5C, 2Z5E

  • PubMed Abstract: 
  • Eukaryotic 20S proteasomes are composed of two alpha-rings and two beta-rings, which form an alphabetabetaalpha stacked structure. Here we describe a proteasome-specific chaperone complex, designated Dmp1-Dmp2, in budding yeast. Dmp1-Dmp2 directly bound to the alpha5 subunit to facilitate alpha-ring formation ...

    Eukaryotic 20S proteasomes are composed of two alpha-rings and two beta-rings, which form an alphabetabetaalpha stacked structure. Here we describe a proteasome-specific chaperone complex, designated Dmp1-Dmp2, in budding yeast. Dmp1-Dmp2 directly bound to the alpha5 subunit to facilitate alpha-ring formation. In Deltadmp1 cells, alpha-rings lacking alpha4 and decreased formation of 20S proteasomes were observed. Dmp1-Dmp2 interacted with proteasome precursors early during proteasome assembly and dissociated from the precursors before the formation of half-proteasomes. Notably, the crystallographic structures of Dmp1 and Dmp2 closely resemble that of PAC3-a mammalian proteasome-assembling chaperone; nonetheless, neither Dmp1 nor Dmp2 showed obvious sequence similarity to PAC3. The structure of the Dmp1-Dmp2-alpha5 complex reveals how this chaperone functions in proteasome assembly and why it dissociates from proteasome precursors before the beta-rings are assembled.


    Organizational Affiliation

    Laboratory of Frontier Science, Core Technology and Research Center, Tokyo Metropolitan Institute of Medical Science, Bunkyo-ku, Tokyo 113-8613, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Proteasome Assembling Chaperone 3A, B122Homo sapiensMutation(s): 0 
Gene Names: PSMG3C7orf48PAC3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BT73 (Homo sapiens)
Explore Q9BT73 
Go to UniProtKB:  Q9BT73
PHAROS:  Q9BT73
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.184 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.642α = 90
b = 88.642β = 90
c = 57.179γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
DENZOdata reduction
HKL-2000data scaling
SHELXSphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance