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- W4361218944 abstract "The salicylate 1,2-dioxygenase from the bacterium Pseudaminobacter salicylatoxidans DSM 6986T (PsSDO) is a versatile metalloenzyme that participates in the aerobic biodegradation of aromatic compounds, such as gentisates and salicylates. Surprisingly, and unrelated to this metabolic role, it has been reported that PsSDO may transform the mycotoxin ochratoxin A (OTA), a molecule that appears in numerous food products that results in serious biotechnological concern. In this work, we show that PsSDO, together with its dioxygenase activity, behaves as an amidohydrolase with a marked specificity for substrates containing a C-terminal phenylalanine residue, similar to OTA, although its presence is not an absolute requirement. This side chain would establish aromatic stacking interactions with the indole ring of Trp104. PsSDO hydrolysed the amide bond of OTA rendering the much less toxic ochratoxin α and L-β-phenylalanine. The binding mode of OTA and of a diverse set of synthetic carboxypeptidase substrates these substrates have been characterized by molecular docking simulations, which has permitted us to propose a catalytic mechanism of hydrolysis by PsSDO that, similarly to metallocarboxypeptidases, assumes a water-induced pathway following a general acid/base mechanism in which the side chain of Glu82 would provide the solvent nucleophilicity required for the enzymatic reaction. Since the PsSDO chromosomal region, absent in other Pseudaminobacter strains, contained a set of genes present in conjugative plasmids, it could have been acquired by horizontal gene transfer, probably from a Celeribacter strain." @default.
- W4361218944 created "2023-03-31" @default.
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- W4361218944 date "2023-05-01" @default.
- W4361218944 modified "2023-10-18" @default.
- W4361218944 title "The salicylate 1,2-dioxygenase from Pseudaminobacter salicylatoxidans DSM 6986T is a bifunctional enzyme that inactivates the mycotoxin ochratoxin A by a novel amidohydrolase activity" @default.
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- W4361218944 doi "https://doi.org/10.1016/j.ijbiomac.2023.124230" @default.
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