6G8N

Yeast 20S proteasome in complex with Cystargolide B Derivative 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

Starting Model: experimental
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Ligand Structure Quality Assessment 


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Literature

Design, synthesis, and evaluation of cystargolide-based beta-lactones as potent proteasome inhibitors.

Niroula, D.Hallada, L.P.Le Chapelain, C.Ganegamage, S.K.Dotson, D.Rogelj, S.Groll, M.Tello-Aburto, R.

(2018) Eur J Med Chem 157: 962-977

  • DOI: https://doi.org/10.1016/j.ejmech.2018.08.052
  • Primary Citation of Related Structures:  
    6G7F, 6G8M, 6G8N

  • PubMed Abstract: 

    The peptidic β-lactone proteasome inhibitors (PIs) cystargolides A and B were used to conduct structure-activity relationship (SAR) studies in order to assess their anticancer potential. A total of 24 different analogs were designed, synthesized and evaluated for proteasome inhibition, for cytotoxicity towards several cancer cell lines, and for their ability to enter intact cells. X-ray crystallographic analysis and subunit selectivity was used to determine the specific subunit binding associated with the structural modification of the β-lactone (P 1 ), peptidic core, (P x and P y ), and end-cap (P z ) of our scaffold. The cystargolide derivative 5k, structurally unique at both P y and P 1 , exhibited the most promising inhibitory activity for the β5 subunit of human proteasomes (IC 50  = 3.1 nM) and significant cytotoxicity towards MCF-7 (IC 50  = 416 nM), MDA-MB-231 (IC 50  = 74 nM) and RPMI 8226 (IC 50  = 41 nM) cancer cell lines. Cellular infiltration assays revealed that minor structural modifications have significant effects on the ability of our PIs to inhibit intracellular proteasomes, and we identified 5k as a promising candidate for continued therapeutic studies. Our novel drug lead 5k is a more potent proteasome inhibitor than carfilzomib with mid-to-low nanomolar IC 50 measurements and it is cytotoxic against multiple cancer cell lines at levels approaching those of carfilzomib.


  • Organizational Affiliation

    Department of Chemistry, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA.


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
UniProt
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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 
Gene Names: PRE2DOA3PRG1YPR103WP8283.10
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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Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EQB
Query on EQB

Download Ideal Coordinates CCD File 
EA [auth H]
GA [auth K]
IA [auth N]
LA [auth V]
OA [auth Y]
EA [auth H],
GA [auth K],
IA [auth N],
LA [auth V],
OA [auth Y],
RA [auth b]
(2~{S},3~{S})-3-methyl-2-[(1~{R})-2-[[(2~{S})-3-methyl-1-[[(2~{S})-3-methyl-1-oxidanylidene-1-phenylmethoxy-butan-2-yl] amino]-1-oxidanylidene-butan-2-yl]amino]-1-oxidanyl-2-oxidanylidene-ethyl]pentanoic acid
C25 H38 N2 O7
RMHIPIPWRGRHJG-RKFFNLMFSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
DA [auth G],
KA [auth U]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

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CA [auth G]
FA [auth I]
HA [auth K]
JA [auth N]
MA [auth V]
CA [auth G],
FA [auth I],
HA [auth K],
JA [auth N],
MA [auth V],
NA [auth W],
PA [auth Y],
QA [auth Z]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.22α = 90
b = 302.72β = 112.82
c = 143.97γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
REFMACphasing
REFMACrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-12
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary