6OJS image
Entry Detail
PDB ID:
6OJS
Keywords:
TRANSFERASE/TRANSFERASE INHIBITOR
Title:
Crystal structure of TS-DHFR from Cryptosporidium hominis in complex with NADPH, FdUMP, MTX and 2-amino-4-oxo-4,7-dihydro-pyrrolo[2,3-d]pyrimidine-methyl-phenyl-D-glutamic acid
Biological Source:
Source Organism:
Cryptosporidium hominis
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2019-04-12
Release Date:
2019-06-19
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.21 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
6OJS validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Bifunctional dihydrofolate reductase-thymidylate synthase
Chain IDs:A, B, C, D, E
Chain Length:521
Number of Molecules:5
Biological Source:Cryptosporidium hominis
UniProt ID:A0A0S4TER9 Pfam ID:PF00186, PF00303 EC:1.5.1.3
Ligand Molecules
D96
MTX
NDP
UFP
Primary Citation
Understanding the structural basis of species selective, stereospecific inhibition for Cryptosporidium and human thymidylate synthase.
Febs Lett. 593 2069 2078 (2019)
PMID: 31172516 DOI: 10.1002/1873-3468.13474

Abstact

Thymidylate synthase (TS), found in all organisms, is an essential enzyme responsible for the de novo synthesis of deoxythymidine monophosphate. The TS active sites of the protozoal parasite Cryptosporidium hominis and human are relatively conserved. Evaluation of antifolate compound 1 and its R-enantiomer 2 against both enzymes reveals divergent inhibitor selectivity and enzyme stereospecificity. To establish how C. hominis and human TS (ChTS and hTS) selectively discriminate 1 and 2, respectively, we determined crystal structures of ChTS complexed with 2 and hTS complexed with 1 or 2. Coupled with the previously determined structure of ChTS complexed with 1, we discuss a possible mechanism for enzyme stereospecificity and inhibitor selectivity.

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Primary Citation of related structures
6OJS