5x66

Human thymidylate synthase in complex with dUMP and methotrexate

spinqualitylabelsall models 5x66, resolution 1.99Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5x66 is a 6 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.99Å Ligands: MTX, UMP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TYSY_HUMAN Contributes to the de novo mitochondrial thymidylate biosynthesis pathway. Publication Abstract from PubMed Thymidylate synthase (TS) is the sole enzyme responsible for de novo biosynthesis of thymidylate (TMP) and is essential for cell proliferation and survival. Inhibition of human TS (hTS) has been extensively investigated for cancer chemotherapy, but several aspects of its activity and regulation are still uncertain. In this study, we performed comprehensive structural and biophysical studies of hTS using crystallography and thermal shift assay and provided the first detailed structural information on the conformational changes induced by ligand binding to the hTS active site. We found that upon binding of the antifolate agents raltitrexed and nolatrexed, the two insert regions in hTS, the functions of which are unclear, undergo positional shifts toward the catalytic center. We investigated the inactive conformation of hTS and found that the two insert regions are also involved in the conformational transition between the active and inactive state of hTS. Moreover, we identified a ligand-binding site in the dimer interface, suggesting that the cavity in the dimer interface could serve as an allosteric site of hTS to regulate the conformational switching between the active and inactive states. On the basis of these findings, we propose a regulatory mechanism of hTS activity that involves allosteric regulation of interactions of hTS with its own mRNA depending on cellular demands for TMP. Structural analyses of human thymidylate synthase reveal a site that may control conformational switching between active and inactive states.,Chen D, Jansson A, Sim D, Larsson A, Nordlund P J Biol Chem. 2017 Aug 11;292(32):13449-13458. doi: 10.1074/jbc.M117.787267. Epub , 2017 Jun 20. PMID:28634233 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Thymidylate synthase 3D structures

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