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- W2078320747 abstract "NAD(P)H quinone reductase [NAD(P)H-QR] present in the latex of Hevea brasiliensis Müll.-Arg. (Euphorbiaceae) was purified to homogeniety from the B-serum fraction obtained by freeze-thawing of the bottom fraction of ultracentrifuged fresh latex. The purification protocol involved acetone fractionation, heat treatment, ion exchange chromatography and affinity chromatography. The M(r) determined by SDS-PAGE for the protein subunit was 21 kDa, and the molecular mass of the native enzyme estimated by gel filtration was 83 kDa, indicating that the native enzyme is a homotetramer. The enzyme showed pH stability over a range of 6 to at least 10 (with an optimum at pH 8) and thermal stability up to 80 degrees C. High NAD(P)H-QR activity (70%) was still retained after 10 h of preincubation at 80 degrees C. A comparable substrate specificity for this enzyme was observed among menadione, p-benzoquinone, juglone, and plumbagin, with only duroquinone generating a lower activity. Positive correlations between latex NAD(P)H-QR activity and rubber yield per tapping [fresh latex (r=0.89, P<0.01), dry rubber (r=0.81, P<0.01)] together with flow time (r=0.85, P<0.01) indicated that enzyme activity could possibly be used as a marker to predict the yield potential of selected clones." @default.
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- W2078320747 date "2002-09-01" @default.
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- W2078320747 title "Purification and characterization of NAD(P)H quinone reductase from the latex of Hevea brasiliensis Müll.-Arg. (Euphorbiaceae)" @default.
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- W2078320747 doi "https://doi.org/10.1016/s0031-9422(02)00233-9" @default.
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