4Y6Z

Yeast 20S proteasome in complex with Ac-PAL-ep


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Systematic Analyses of Substrate Preferences of 20S Proteasomes Using Peptidic Epoxyketone Inhibitors.

Huber, E.M.de Bruin, G.Heinemeyer, W.Paniagua Soriano, G.Overkleeft, H.S.Groll, M.

(2015) J Am Chem Soc 137: 7835-7842

  • DOI: https://doi.org/10.1021/jacs.5b03688
  • Primary Citation of Related Structures:  
    4Y69, 4Y6A, 4Y6V, 4Y6Z, 4Y70, 4Y74, 4Y75, 4Y77, 4Y78, 4Y7W, 4Y7X, 4Y7Y, 4Y80, 4Y81, 4Y82, 4Y84, 4Y8G, 4Y8H, 4Y8I, 4Y8J, 4Y8K, 4Y8L, 4Y8M, 4Y8N, 4Y8O, 4Y8P, 4Y8Q, 4Y8R, 4Y8S, 4Y8T, 4Y8U, 4Y9Y, 4Y9Z, 4YA0, 4YA1, 4YA2, 4YA3, 4YA4, 4YA5, 4YA7, 4YA9

  • PubMed Abstract: 

    Cleavage analyses of 20S proteasomes with natural or synthetic substrates allowed to infer the substrate specificities of the active sites and paved the way for the rational design of high-affinity proteasome inhibitors. However, details of cleavage preferences remained enigmatic due to the lack of appropriate structural data. In a unique approach, we here systematically examined substrate specificities of yeast and human proteasomes using irreversibly acting α',β'epoxyketone (ep) inhibitors. Biochemical and structural analyses provide unique insights into the substrate preferences of the distinct active sites and highlight differences between proteasome types that may be considered in future inhibitor design efforts. (1) For steric reasons, epoxyketones with Val or Ile at the P1 position are weak inhibitors of all active sites. (2) Identification of the β2c selective compound Ac-LAE-ep represents a promising starting point for the development of compounds that discriminate between β2c and β2i. (3) The compound Ac-LAA-ep was found to favor subunit β5c over β5i by three orders of magnitude. (4) Yeast β1 and human β1c subunits preferentially bind Asp and Leu in their S1 pockets, while Glu and large hydrophobic residues are not accepted. (5) Exceptional structural features in the β1/2 substrate binding channel give rise to the β1 selectivity of compounds featuring Pro at the P3 site. Altogether, 23 different epoxyketone inhibitors, five proteasome mutants, and 43 crystal structures served to delineate a detailed picture of the substrate and ligand specificities of proteasomes and will further guide drug development efforts toward subunit-specific proteasome inhibitors for applications as diverse as cancer and autoimmune disorders.


  • Organizational Affiliation

    †Center for Integrated Protein Science at the Department Chemie, Lehrstuhl für Biochemie, Technische Universität München, 85748 Garching, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-2
A, O
250Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-3
B, P
258Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-4
C, Q
254Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-5
D, R
260Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-6
E, S
234Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Probable proteasome subunit alpha type-7
F, T
288Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-1
G, U
252Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-2
H, V
232Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-3
I, W
205Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-4
J, X
198Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-5
K, Y
212Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-6
L, Z
222Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-7AA [auth a],
M
246Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-1BA [auth b],
N
196Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
Ac-PAL-ep5synthetic constructMutation(s): 0 
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Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MES
Query on MES

Download Ideal Coordinates CCD File 
NA [auth K],
SA [auth Y]
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
JA [auth G],
QA [auth N],
RA [auth U],
UA [auth b]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
IA [auth G]
KA [auth I]
LA [auth I]
MA [auth K]
OA [auth L]
IA [auth G],
KA [auth I],
LA [auth I],
MA [auth K],
OA [auth L],
PA [auth N],
TA [auth Z]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.58α = 90
b = 301.57β = 113.25
c = 146.35γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
REFMACphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermanyGR1861/10-
German Research FoundationGermanySFB1035/A2

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-17
    Type: Initial release
  • Version 1.1: 2015-07-01
    Changes: Database references
  • Version 2.0: 2023-11-15
    Changes: Advisory, Atomic model, Author supporting evidence, Data collection, Database references, Derived calculations
  • Version 2.1: 2024-01-10
    Changes: Refinement description