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- W2159809310 abstract "Phenoloxidase from Artemia sinica (AsPO) was purified by Superdex 200 gel-filtration and Q Sepharose fast flow ion-exchange chromatography, and its properties were characterized biochemically and enzymatically by using L-dihydroxyphenylalanine (L-DOPA) as the specific substrate. Results showed that AsPO was isolated as a monomeric protein of 125.5 kDa in molecular mass. The optimal pH value and temperature are 7.0 and 50°C, respectively, for its PO activity. The AsPO had an apparent K(m) value of 4.2 mM on L-DOPA, and 10.9 mM on catechol, respectively. Oxidase inhibitor on PO activity showed that the AsPO was extremely sensitive to ascorbic acid, sodium sulfite, and citric acid; and was very sensitive to cysteine, benzoic acid, and 1-phenyl-2-thiourea. Combined with its specific enzyme activity on L-DOPA and catechol, it can be concluded that AsPO is most probably a typical catechol-type O-diphenoloxidase. Its PO activity was also sensitive to metal ions and chelators, and 20 mM DETC-inhibited PO activity was obviously recovered by 15 mM Cu(2+), indicating that AsPO is most probably a copper-containing metalloenzyme. All these data about specific substrate, sensitivity to oxidase inhibitor metal ions and chelators indicate that the AsPO has the properties of a catechol-type copper-containing O-diphenoloxidase that functions as a vital humoral factor in host defense via melaninization as in other Crustaceans." @default.
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- W2159809310 date "2011-09-01" @default.
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- W2159809310 title "Purification and characterization of phenoloxidase from brine shrimp <italic>Artemia sinica</italic>" @default.
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- W2159809310 doi "https://doi.org/10.1093/abbs/gmr061" @default.
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