6kcm

Crystal structure of Plasmodium falciparum HPPK-DHPS S436F/A437G/A613S with pterin and p-hydrobenzoate

spinqualitylabelsall models 6kcm, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6kcm 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 2.3Å Ligands: ACT, ATP, CA, GOL, MG, PE0, PHB Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q25704_PLAFA Publication Abstract from PubMed The clinical efficacy of sulfa drugs as antimalarials has declined owing to the evolution of resistance in Plasmodium falciparum (Pf) malaria parasites. In order to understand the basis of this resistance and to design more effective antimalarials, we have solved 13 structures of the bifunctional enzyme 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK)-dihydropteroate synthase (DHPS) from wild-type (WT) P. falciparum and sulfa-resistant mutants, both as apoenzyme and as complexes with pteroate (PTA) and sulfa derivatives. The structures of these complexes show that PTA, which effectively inhibits both the WT and mutants, stays in active sites without steric constraint. In contrast, parts of the sulfa compounds situated outside of the substrate envelope are in the vicinity of the resistance mutations. Steric conflict between compound and mutant residue along with increased flexibility of loop D2 in the mutants can account for the reduced compound binding affinity to the mutants. Kinetic data show that the mutants have enhanced enzyme activity compared with the WT. These PfDHPS structural insights are critical for the design of novel, substrate envelope-compliant DHPS inhibitors that are less vulnerable to resistance mutations. DATABASES: The data reported in this paper have been deposited in the Protein Data Bank, www.wwpdb.org. PDB ID codes: 6JWQ for apoWT; 6JWR, 6JWS, and 6JWT for PTA complexes of WT, A437G (3D7), and V1/S; 6JWU, 6JWV, and 6JWW for STZ-DHP complexes of WT, 3D7, and V1/S; 6JWX, 6JWY, and 6JWZ for SDX-DHP complexes of WT, 3D7, and W2; 6KCK, 6KCL, and 6KCM for Pterin/pHBA complexes of WT, TN1, and W2. The structure of Plasmodium falciparum hydroxymethyldihydropterin pyrophosphokinase-dihydropteroate synthase reveals the basis of sulfa resistance.,Chitnumsub P, Jaruwat A, Talawanich Y, Noytanom K, Liwnaree B, Poen S, Yuthavong Y FEBS J. 2019 Dec 28. doi: 10.1111/febs.15196. PMID:31883412 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dihydropteroate synthase 3D structures HPPK 3D structures

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