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 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.253 

wwPDB Validation 3D Report Full Report


This is version 1.3 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

  • 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 med ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA mismatch repair protein HSM3
A, B
491Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: HSM3
Find proteins for P38348 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P38348
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
26S protease regulatory subunit 7 homolog
C, D
100Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: RPT1 (CIM5, YTA3)
Find proteins for P33299 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P33299
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.253 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 185.299α = 90.00
b = 185.299β = 90.00
c = 357.382γ = 120.00
Software Package:
Software NamePurpose
JDirectordata collection
BUSTER-TNTrefinement
PHASERphasing
XDSdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-06-12
    Type: Database references
  • Version 1.2: 2013-07-10
    Type: Database references
  • Version 1.3: 2017-11-15
    Type: Refinement description