4Q0E

Crystal structure of TS-DHFR from Cryptosporidium hominis in complex with NADPH, FdUMP and 2-amino-4-oxo-4,7-dihydro-pyrrolo[2,3-d]pyrimidine-methyl-phenyl-L-glutamic acid.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.255 

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Literature

Structural studies provide clues for analog design of specific inhibitors of Cryptosporidium hominis thymidylate synthase-dihydrofolate reductase.

Kumar, V.P., Cisneros, J.A., Frey, K.M., Castellanos-Gonzalez, A., Wang, Y., Gangjee, A., White, A.C., Jorgensen, W.L., Anderson, K.S.

(2014) Bioorg Med Chem Lett 24: 4158-4161

  • DOI: 10.1016/j.bmcl.2014.07.049
  • Primary Citation of Related Structures:  
    4Q0D, 4Q0E

  • PubMed Abstract: 

    • Cryptosporidium is the causative agent of a gastrointestinal disease, cryptosporidiosis, which is often fatal in immunocompromised individuals and children. Thymidylate synthase (TS) and dihydrofolate reductase (DHFR) are essential enzymes in the folate biosynthesis pathway and are well established as drug targets in cancer, bacterial infections, and malaria ...

    Cryptosporidium is the causative agent of a gastrointestinal disease, cryptosporidiosis, which is often fatal in immunocompromised individuals and children. Thymidylate synthase (TS) and dihydrofolate reductase (DHFR) are essential enzymes in the folate biosynthesis pathway and are well established as drug targets in cancer, bacterial infections, and malaria. Cryptosporidium hominis has a bifunctional thymidylate synthase and dihydrofolate reductase enzyme, compared to separate enzymes in the host. We evaluated lead compound 1 from a novel series of antifolates, 2-amino-4-oxo-5-substituted pyrrolo[2,3-d]pyrimidines as an inhibitor of Cryptosporidium hominis thymidylate synthase with selectivity over the human enzyme. Complementing the enzyme inhibition compound 1 also has anti-cryptosporidial activity in cell culture. A crystal structure with compound 1 bound to the TS active site is discussed in terms of several van der Waals, hydrophobic and hydrogen bond interactions with the protein residues and the substrate analog 5-fluorodeoxyuridine monophosphate (TS), cofactor NADPH and inhibitor methotrexate (DHFR). Another crystal structure in complex with compound 1 bound in both the TS and DHFR active sites is also reported here. The crystal structures provide clues for analog design and for the design of ChTS-DHFR specific inhibitors.

    Organizational Affiliation: 

    Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA. Electronic address: karen.anderson@yale.edu.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional dihydrofolate reductase-thymidylate synthaseA, B, C, D, E521Cryptosporidium hominisMutation(s): 0 
Gene Names: Chro.40506, TS-DHFR
EC: 2.1.1.45 (PDB Primary Data), 1.5.1.3 (PDB Primary Data)
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP
Download Ideal Coordinates CCD File 
F [auth A],
J [auth B],
N [auth C],
R [auth D],
V [auth E]		NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N		 Ligand Interaction
2XB
Query on 2XB
Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
L [auth B],
M [auth B],
P [auth C],
H [auth A],
I [auth A],
L [auth B],
M [auth B],
P [auth C],
Q [auth C],
T [auth D],
U [auth D],
X [auth E],
Y [auth E]
N-{4-[(2-amino-4-hydroxy-7H-pyrrolo[2,3-d]pyrimidin-5-yl)methyl]benzoyl}-L-glutamic acid
C19 H19 N5 O6
VDHBMZRBPMTLGE-LBPRGKRZSA-N		 Ligand Interaction
UFP
Query on UFP
Download Ideal Coordinates CCD File 
G [auth A],
K [auth B],
O [auth C],
S [auth D],
W [auth E]		5-FLUORO-2'-DEOXYURIDINE-5'-MONOPHOSPHATE
C9 H12 F N2 O8 P
HFEKDTCAMMOLQP-RRKCRQDMSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.255 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 213.629α = 90
b = 115.54β = 94.56
c = 217.973γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
CBASSdata collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description