7mya

Structure of proline utilization A with the FAD covalently-modified by 1,3-dithiolane

spinqualitylabelsall models 7mya, resolution 1.56Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7mya is a 2 chain structure with sequence from Sinorhizobium meliloti SM11. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.56Å Ligands: MG, NAD, PEG, PG4, PGE, SO4, UJJ Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function F7X6I3_SINMM Oxidizes proline to glutamate for use as a carbon and nitrogen source.[PIRNR:PIRNR000197] Publication Abstract from PubMed Proline dehydrogenase (PRODH) is a flavoenzyme that catalyzes the first step of proline catabolism, the oxidation of l-proline to Delta(1)-pyrroline-5-carboxylate. PRODH has emerged as a cancer therapy target because of its involvement in the metabolic reprogramming of cancer cells. Here, we report the discovery of a new class of PRODH inactivator, which covalently and irreversibly modifies the FAD in a light-dependent manner. Two examples, 1,3-dithiolane-2-carboxylate and tetrahydrothiophene-2-carboxylate, have been characterized using X-ray crystallography (1.52-1.85 A resolution), absorbance spectroscopy, and enzyme kinetics. The structures reveal that in the dark, these compounds function as classical reversible, proline analogue inhibitors. However, exposure of enzyme-inhibitor cocrystals to bright white light induces decarboxylation of the inhibitor and covalent attachment of the residual S-heterocycle to the FAD N5 atom, locking the cofactor into a reduced, inactive state. Spectroscopic measurements of the inactivation process in solution confirm the requirement for light and show that blue light is preferred. Enzyme activity assays show that the rate of inactivation is enhanced by light and that the inactivation is irreversible. We also demonstrate the photosensitivity of cancer cells to one of these compounds. A possible mechanism is proposed involving photoexcitation of the FAD, while the inhibitor is noncovalently bound in the active site, followed by electron transfer, decarboxylation, and radical combination steps. Our results could lead to the development of photopharmacological drugs targeting PRODH. Photoinduced Covalent Irreversible Inactivation of Proline Dehydrogenase by S-Heterocycles.,Campbell AC, Prater AR, Bogner AN, Quinn TP, Gates KS, Becker DF, Tanner JJ ACS Chem Biol. 2021 Sep 20. doi: 10.1021/acschembio.1c00427. PMID:34542291 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Proline utilization A

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