6PF6

Crystal structure of TS-DHFR from Cryptosporidium hominis in complex with NADPH, FdUMP and 2-(4-((2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)methyl)benzamido)terephthalic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure activity relationship towards design of cryptosporidium specific thymidylate synthase inhibitors.

Czyzyk, D.J.Valhondo, M.Deiana, L.Tirado-Rives, J.Jorgensen, W.L.Anderson, K.S.

(2019) Eur J Med Chem 183: 111673-111673

  • DOI: 10.1016/j.ejmech.2019.111673
  • Primary Citation of Related Structures:  
    6PFE, 6PFD, 6PFG, 6PFF, 6PFI, 6PFH, 6PFA, 6PFC, 6PFB, 6PF5

  • PubMed Abstract: 
  • Cryptosporidiosis is a human gastrointestinal disease caused by protozoans of the genus Cryptosporidium, which can be fatal in immunocompromised individuals. The essential enzyme, thymidylate synthase (TS), is responsible for de novo synthesis of deoxyth ...

    Cryptosporidiosis is a human gastrointestinal disease caused by protozoans of the genus Cryptosporidium, which can be fatal in immunocompromised individuals. The essential enzyme, thymidylate synthase (TS), is responsible for de novo synthesis of deoxythymidine monophosphate. The TS active site is relatively conserved between Cryptosporidium and human enzymes. In previous work, we identified compound 1, (2-amino-4-oxo-4,7-dihydro-pyrrolo[2,3-d]pyrimidin-methyl-phenyl-l-glutamic acid), as a promising selective Cryptosporidium hominis TS (ChTS) inhibitor. In the present study, we explore the structure-activity relationship around 1 glutamate moiety by synthesizing and biochemically evaluating the inhibitory activity of analogues against ChTS and human TS (hTS). X-Ray crystal structures were obtained for compounds bound to both ChTS and hTS. We establish the importance of the 2-phenylacetic acid moiety methylene linker in optimally positioning compounds 23, 24, and 25 within the active site. Moreover, through the comparison of structural data for 5, 14, 15, and 23 bound in both ChTS and hTS identified that active site rigidity is a driving force in determining inhibitor selectivity.


    Organizational Affiliation

    Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA; Department of Molecular Biophysics and Biochemistry, Yale University, 225 Prospect Street, PO Box 208107, New Haven, CT, 06520, USA. Electronic address: karen.anderson@yale.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thymidylate synthase,Thymidylate synthase ABCD290Homo sapiensMutation(s): 0 
Gene Names: TYMSTSOK/SW-cl.29
EC: 2.1.1.45
Find proteins for P04818 (Homo sapiens)
Explore P04818 
Go to UniProtKB:  P04818
NIH Common Fund Data Resources
PHAROS:  P04818
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OEJ
Query on OEJ

Download Ideal Coordinates CCD File 
B, C
2-({4-[(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)methyl]benzene-1-carbonyl}amino)benzene-1,4-dicarboxylic acid
C22 H17 N5 O6
UKZJDHHDTGYQBX-UHFFFAOYSA-N
 Ligand Interaction
UMP
Query on UMP

Download Ideal Coordinates CCD File 
A, B, C, D
2'-DEOXYURIDINE 5'-MONOPHOSPHATE
C9 H13 N2 O8 P
JSRLJPSBLDHEIO-SHYZEUOFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.215α = 90
b = 152.215β = 90
c = 107.07γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI083146
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States5T32AI007404

Revision History 

  • Version 1.0: 2019-10-16
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence