Isoenzymes of polyphenol oxidase from high l‐dopa containing velvet bean
1978
ZENIN, C. T. | PARK, Y. K.
The seeds, leaves, and stem of velvet bean (Stizolobium aterrimum) contained high concentrations of L‐DOPA and polyphenol oxidase. Polyacrylamide‐gel electrophoresis revealed three polyphenol oxidase isoenzymes in the seeds of velvet bean, two in the leaves and stem. All isoenzymes were active with o‐diphenols such as catechol, caffeic acid, d‐catechin and L‐DOPA. L‐Tyrosine was not active to the isoenzymes. Polyphenol oxidase semipurified by ammonium sulfate fractionation exhibits a smaller Km for L‐DOPA than other substrates.
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