7wmx

Crystal structure of methylenetetrahydrofolate reductase MSMEG_6649 from Mycobacterium smegmatis with 5,10-methylenetetrahydrofolate

spinqualitylabelsall models 7wmx, resolution 2.26Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7wmx is a 1 chain structure with sequence from Mycolicibacterium smegmatis MC2 155. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.264Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0R6S0_MYCS2 Publication Abstract from PubMed 5,10-Methylenetetraydrofolate reductase (MTHFR) is a key enzyme in folate metabolism. MSMEG_6649, a non-canonical MTHFR from Mycobacterium smegmatis, was previously reported as a monomeric protein lacking the flavin coenzyme. However, the structural basis for its unique flavin-independent catalytic mechanism remains poorly understood. Here, we determined the crystal structures of apo MTHFR MSMEG_6649 and its complex with NADH from M. smegmatis. Structural analysis revealed that the groove formed by the loops 4 and 5 of non-canonical MSMEG_6649 interacting with FAD was significantly larger than that of canonical MTHFR. Meanwhile, the NADH-binding site in MSMEG_6649 is highly similar to the FAD binding site in canonical MTHFR, suggesting that NADH plays the same role (immediate hydride donor for methylenetetraydrofolate) as FAD in the catalytic reaction. Using biochemical analysis, molecular modeling, and site-directed mutagenesis, the critical residues participating in the binding of NADH and the substrate 5,10-methylenetetrahydrofolate as well as the product 5-methyltetrahydrofolate were identified and validated. Taken together, this work not only provides a good starting point for understanding the potential catalytic mechanism for MSMEG_6649, but also identifies an exploitable target for the development of anti-mycobacterial drugs. Structural and functional characterization of a mycobacterial methylenetetrahydrofolate reductase utilizing NADH as the exclusive cofactor.,Li J, Yang M, Li W, Lu C, Feng D, Shang Z, Wang C, Lin W Biochem J. 2023 Jul 26;480(14):1129-1146. doi: 10.1042/BCJ20230138. PMID:37435857 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Methylenetetrahydrofolate reductase 3D structures

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