7r6g

Crystal structure of DfrA5 dihydrofolate reductase in complex with TRIMETHOPRIM and NADPH

spinqualitylabelsall models 7r6g, resolution 2.61Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7r6g is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.61Å Ligands: NDP, SO4, TOP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DYR5_ECOLX Key enzyme in folate metabolism. Catalyzes an essential reaction for de novo glycine and purine synthesis, and for DNA precursor synthesis (By similarity). Publication Abstract from PubMed Two plasmid-encoded dihydrofolate reductase (DHFR) isoforms, DfrA1 and DfrA5, that give rise to high levels of resistance in Gram-negative bacteria were structurally and biochemically characterized to reveal the mechanism of TMP resistance and to support phylogenic groupings for drug development against antibiotic resistant pathogens. Preliminary screening of novel antifolates revealed related chemotypes that showed high levels of inhibitory potency against Escherichia coli chromosomal DHFR (EcDHFR), DfrA1, and DfrA5. Kinetics and biophysical analysis, coupled with crystal structures of trimethoprim bound to EcDHFR, DfrA1 and DfrA5, and two propargyl-linked antifolates (PLA) complexed with EcDHFR, DfrA1 and DfrA5, were determined to define structural features of the substrate binding pocket and guide synthesis of pan-DHFR inhibitors. Structure-guided functional studies of plasmid-encoded dihydrofolate reductases reveal a common mechanism of trimethoprim resistance in Gram-negative pathogens.,Krucinska J, Lombardo MN, Erlandsen H, Estrada A, Si D, Viswanathan K, Wright DL Commun Biol. 2022 May 13;5(1):459. doi: 10.1038/s42003-022-03384-y. PMID:35562546 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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