6KP2 image
Entry Detail
PDB ID:
6KP2
Title:
Quadruple mutant plasmodium falciparum dihydrofolate reductase complexed with B10042
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-08-14
Release Date:
2019-12-04
Method Details:
Experimental Method:
Resolution:
1.97 Å
R-Value Free:
0.21
R-Value Work:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Bifunctional dihydrofolate reductase-thymidylate synthase
Mutations:N51I+C59R+S108N+I164L
Chain IDs:A, B
Chain Length:608
Number of Molecules:2
Biological Source:Plasmodium falciparum
Primary Citation
6-Hydrophobic aromatic substituent pyrimethamine analogues as potential antimalarials for pyrimethamine-resistant Plasmodium falciparum.
Bioorg.Med.Chem. 27 115158 115158 (2019)
PMID: 31685330 DOI: 10.1016/j.bmc.2019.115158

Abstact

The series of des-Cl (unsubstituted) and m-Cl phenyl analogues of PYR with various flexible 6-substituents were synthesized and studied for the binding affinities with highly resistant quadruple mutant (QM) DHFR. The derivatives carrying 4 atoms linker with a terminal carboxyl substituted on the aromatic ring exhibited good inhibition to the QM enzyme and also showed effective antimalarial activities against resistant P. falciparum bearing the mutant enzymes with relatively low cytotoxicity to mammalian cells. The X-ray crystallographic analysis of the enzyme-inhibitor complexes suggested that the hydrophobic substituent at 6-position was accommodated well in the hydrophobic pocket and the optimal length of the flexible linker could effectively promote the binding of the terminal carboxyl group to the key amino acid residues, Arg59 and Arg122.

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Primary Citation of related structures