English: Modified from the mechanism added by Haynathart and converted to SVG by Д.Ильин. The structure of the product in (2) now shows the carbon-carbon double bond of the enol tautomer.
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Captions
Catalytic mechanism of the breakdown of isocitrate into oxalosuccinate, then into a final product of alpha-ketuglutarate. The oxalosuccinate intermediate is hypothetical; it has never been observed in the decarboxylating version of the enzyme.