6I6X

New Irreversible a-l-Iduronidase Inhibitors and Activity-Based Probes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

New Irreversible alpha-l-Iduronidase Inhibitors and Activity-Based Probes.

Artola, M.Kuo, C.L.McMahon, S.A.Oehler, V.Hansen, T.van der Lienden, M.He, X.van den Elst, H.Florea, B.I.Kermode, A.R.van der Marel, G.A.Gloster, T.M.Codee, J.D.C.Overkleeft, H.S.Aerts, J.M.F.G.

(2018) Chemistry 24: 19081-19088

  • DOI: https://doi.org/10.1002/chem.201804662
  • Primary Citation of Related Structures:  
    6I6R, 6I6X

  • PubMed Abstract: 

    Cyclophellitol aziridines are potent irreversible inhibitors of retaining glycosidases and versatile intermediates in the synthesis of activity-based glycosidase probes (ABPs). Direct 3-amino-2-(trifluoromethyl)quinazolin-4(3H)-one-mediated aziridination of l-ido-configured cyclohexene has enabled the synthesis of new covalent inhibitors and ABPs of α-l-iduronidase, deficiency of which underlies the lysosomal storage disorder mucopolysaccharidosis type I (MPS I). The iduronidase ABPs react covalently and irreversibly in an activity-based manner with human recombinant α-l-iduronidase (rIDUA, Aldurazyme ® ). The structures of IDUA when complexed with the inhibitors in a non-covalent transition state mimicking form and a covalent enzyme-bound form provide insights into its conformational itinerary. Inhibitors 1-3 adopt a half-chair conformation in solution ( 4 H 3 and 3 H 4 ), as predicted by DFT calculations, which is different from the conformation of the Michaelis complex observed by crystallographic studies. Consequently, 1-3 may need to overcome an energy barrier in order to switch from the 4 H 3 conformation to the transition state ( 2, 5 B) binding conformation before reacting and adopting a covalent 5 S 1 conformation. rIDUA can be labeled with fluorescent Cy5 ABP 2, which allows monitoring of the delivery of therapeutic recombinant enzyme to lysosomes, as is intended in enzyme replacement therapy for the treatment of MPS I patients.


  • Organizational Affiliation

    Department of Bio-organic Synthesis, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-L-iduronidase627Homo sapiensMutation(s): 0 
EC: 3.2.1.76
UniProt & NIH Common Fund Data Resources
Find proteins for P35475 (Homo sapiens)
Explore P35475 
Go to UniProtKB:  P35475
PHAROS:  P35475
GTEx:  ENSG00000127415 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35475
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P35475-1
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-L-iduronidase627Homo sapiensMutation(s): 0 
EC: 3.2.1.76
UniProt & NIH Common Fund Data Resources
Find proteins for P35475 (Homo sapiens)
Explore P35475 
Go to UniProtKB:  P35475
PHAROS:  P35475
GTEx:  ENSG00000127415 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35475
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P35475-1
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C, E
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
F
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G09724ZC
GlyCosmos:  G09724ZC
GlyGen:  G09724ZC
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
G [auth A],
R [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
H6B
Query on H6B

Download Ideal Coordinates CCD File 
H [auth A],
S [auth B]
(1~{R},2~{R},3~{R},4~{S},5~{S},6~{R})-7-methyl-3,4,5-tris(oxidanyl)-7-azabicyclo[4.1.0]heptane-2-carboxylic acid
C8 H13 N O5
UUIBNQLYUYNUOZ-FKAYCGLJSA-N
TLA
Query on TLA

Download Ideal Coordinates CCD File 
P [auth A],
V [auth B]
L(+)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-JCYAYHJZSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
I [auth A]
J [auth A]
K [auth A]
L [auth A]
M [auth A]
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
T [auth B],
U [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
Q [auth A],
W [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 259.184α = 90
b = 259.184β = 90
c = 71.01γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
xia2data reduction
xia2data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-05
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2024-01-24
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary