6a2l

Crystal structure of quadruple mutant (N51I+C59R+S108N+I164L) Plasmodium falciparum DHFR-TS complexed with BT1, NADPH, and dUMP

spinqualitylabelsall models 6a2l, resolution 2.38Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6a2l is a 2 chain structure with sequence from Plasmodium falciparum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.38Å Ligands: 9QO, NAP, UMP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function D9N170_PLAFA Bifunctional enzyme. Involved in de novo dTMP biosynthesis. Key enzyme in folate metabolism (By similarity).[PIRNR:PIRNR000389] Publication Abstract from PubMed The S108N mutation of dihydrofolate reductase (DHFR) renders Plasmodium falciparum malaria parasites resistant to pyrimethamine through steric clash with the rigid side chain of the inhibitor. Inhibitors with flexible side chains can avoid this clash and retain effectiveness against the mutant. However, other mutations such as N108S reversion confer resistance to flexible inhibitors. We designed and synthesized hybrid inhibitors with two structural types in a single molecule, which are effective against both wild-type and multiple mutants of P. falciparum through their selective target binding, as demonstrated by X-ray crystallography. Furthermore, the hybrid inhibitors can forestall the emergence of new resistant mutants, as shown by selection of mutants resistant to hybrid compound BT1 from a diverse PfDHFR random mutant library expressed in a surrogate bacterial system. These results show that it is possible to develop effective antifolate antimalarials to which the range of parasite resistance mutations is greatly reduced. Hybrid Inhibitors of Malarial Dihydrofolate Reductase with Dual Binding Modes That Can Forestall Resistance.,Tarnchompoo B, Chitnumsub P, Jaruwat A, Shaw PJ, Vanichtanankul J, Poen S, Rattanajak R, Wongsombat C, Tonsomboon A, Decharuangsilp S, Anukunwithaya T, Arwon U, Kamchonwongpaisan S, Yuthavong Y ACS Med Chem Lett. 2018 Nov 7;9(12):1235-1240. doi:, 10.1021/acsmedchemlett.8b00389. eCollection 2018 Dec 13. PMID:30613332 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dihydrofolate reductase 3D structures

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