4JPO

5A resolution structure of Proteasome Assembly Chaperone Hsm3 in complex with a C-terminal fragment of Rpt1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.00 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Reconfiguration of the proteasome during chaperone-mediated assembly.

Park, S.Li, X.Kim, H.M.Singh, C.R.Tian, G.Hoyt, M.A.Lovell, S.Battaile, K.P.Zolkiewski, M.Coffino, P.Roelofs, J.Cheng, Y.Finley, D.

(2013) Nature 497: 512-516

  • DOI: 10.1038/nature12123
  • Primary Citation of Related Structures:  
    4JPO

  • PubMed Abstract: 
  • The proteasomal ATPase ring, comprising Rpt1-Rpt6, associates with the heptameric α-ring of the proteasome core particle (CP) in the mature proteasome, with the Rpt carboxy-terminal tails inserting into pockets of the α-ring. Rpt ring assembly is mediated by four chaperones, each binding a distinct Rpt subunit ...

    The proteasomal ATPase ring, comprising Rpt1-Rpt6, associates with the heptameric α-ring of the proteasome core particle (CP) in the mature proteasome, with the Rpt carboxy-terminal tails inserting into pockets of the α-ring. Rpt ring assembly is mediated by four chaperones, each binding a distinct Rpt subunit. Here we report that the base subassembly of the Saccharomyces cerevisiae proteasome, which includes the Rpt ring, forms a high-affinity complex with the CP. This complex is subject to active dissociation by the chaperones Hsm3, Nas6 and Rpn14. Chaperone-mediated dissociation was abrogated by a non-hydrolysable ATP analogue, indicating that chaperone action is coupled to nucleotide hydrolysis by the Rpt ring. Unexpectedly, synthetic Rpt tail peptides bound α-pockets with poor specificity, except for Rpt6, which uniquely bound the α2/α3-pocket. Although the Rpt6 tail is not visualized within an α-pocket in mature proteasomes, it inserts into the α2/α3-pocket in the base-CP complex and is important for complex formation. Thus, the Rpt-CP interface is reconfigured when the lid complex joins the nascent proteasome to form the mature holoenzyme.


    Organizational Affiliation

    Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA mismatch repair protein HSM3A, B491Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: HSM3YBR272CYBR1740
UniProt
Find proteins for P38348 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38348 
Go to UniProtKB:  P38348
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
26S protease regulatory subunit 7 homologC, D100Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: RPT1CIM5YTA3YKL145W
UniProt
Find proteins for P33299 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P33299 
Go to UniProtKB:  P33299
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.00 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.254 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 185.299α = 90
b = 185.299β = 90
c = 357.382γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
JDirectordata collection
XDSdata reduction
BUSTERrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Database references
  • Version 1.2: 2013-07-10
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description
  • Version 1.4: 2020-02-26
    Changes: Data collection, Database references