3E47

Crystal Structure of the Yeast 20S Proteasome in Complex with Homobelactosin C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

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Literature

Inhibitor-binding mode of homobelactosin C to proteasomes: new insights into class I MHC ligand generation

Groll, M.Larionov, O.V.Huber, R.de Meijere, A.

(2006) Proc Natl Acad Sci U S A 103: 4576-4579

  • DOI: https://doi.org/10.1073/pnas.0600647103
  • Primary Citation of Related Structures:  
    3E47

  • PubMed Abstract: 

    Most class I MHC ligands are generated from the vast majority of cellular proteins by proteolysis within the ubiquitin-proteasome pathway and are presented on the cell surface by MHC class I molecules. Here, we present the crystallographic analysis of yeast 20S proteasome in complex with the inhibitor homobelactosin C. The structure reveals a unique inhibitor-binding mode and provides information about the composition of proteasomal primed substrate-binding sites. IFN-gamma inducible substitution of proteasomal constitutive subunits by immunosubunits modulates characteristics of generated peptides, thus producing fragments with higher preference for binding to MHC class I molecules. The structural data for the proteasome:homobelactosin C complex provide an explanation for involvement of immunosubunits in antigen generation and open perspectives for rational design of ligands, inhibiting exclusively constitutive proteasomes or immunoproteasomes.


  • Organizational Affiliation

    Ludwig Maximilians Universität, Adolf Butenandt Institut, Butenandtstrasse 5, Gebäude B, D-81377 Munich, Germany. mgroll@med.uni-muenchen.de


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component Y7
A, O
250Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component Y13
B, P
244Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PRE6
C, Q
241Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PUP2
D, R
242Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PRE5
E, S
233Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component C1
F, T
244Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component C7-alpha
G, U
243Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PUP1
H, V
222Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PUP3
I, W
204Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component C11
J, X
198Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PRE2
K, Y
212Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component C5
L, Z
222Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PRE4AA [auth 1],
M
233Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome component PRE3BA [auth 2],
N
196Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.25.1
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Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ESY
Query on ESY

Download Ideal Coordinates CCD File 
CA [auth K],
DA [auth Y]
benzyl N-[(benzyloxy)carbonyl]-L-alanyl-N~6~-[(2R,3S,4S)-3-formyl-2-hydroxy-4-methylhexanoyl]-L-lysinate
C32 H43 N3 O8
ODPOWFGUTQNCGV-RIBUPYHESA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.49α = 90
b = 301.057β = 112.78
c = 144.453γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description