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• W2080494810 abstract "The biosynthetic mechanism of alpha-amylase synthesis in germinating rice (Oryza sativa L. cv. Kimmazé) seeds has been studied both in vitro and in vivo. Special attention has been focused on the glycosylation of the enzyme molecule. Tunicamycin was found to inhibit glycosylation of alpha-amylase by 98% without significant inhibition of enzyme secretion. The inhibitory effect exerted by the antibiotic on glycosylation did not significantly alter enzyme activity.In an in vitro system using poly-(A) RNA isolated from rice scutellum and the reticulocyte lysate translation system, a precursor form of alpha-amylase (precursor I) is formed. Inhibition of glycosylation by Tunicamycin allowed detection of a nonglycosylated precursor (II) of alpha-amylase. The molecular weight of the nonglycosylated precursor II produced in the presence of Tunicamycin was 2,900 daltons less than that of the mature form of alpha-amylase (44,000) produced in the absence of Tunicamycin, and 1,800 daltons less than the in vitro synthesized molecule.The inhibition of glycosylation by Tunicamycin as well as in vitro translation helped clarify the heterogeneity of alpha-amylase isozymes. Isoelectrofocusing (pH 4-6) of the products, zymograms, and fluorography were employed on the separated isozyme components. The mature and Tunicamycin-treated nonglycosylated forms of alpha-amylase were found to consist of three isozymes. The in vitro translated precursor forms of alpha-amylase consisted of four multiple components. These results indicate that heterogeneity of alpha-amylase isozymes is not due to glycosylation of the enzyme protein but likely to differences in the primary structure of the protein moiety, which altogether support that rice alpha-amylase isozymes are encoded by multiple genes." @default.
• W2080494810 created "2016-06-24" @default.
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• W2080494810 date "1982-07-01" @default.
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• W2080494810 title "Enzymic Mechanism of Starch Breakdown in Germinating Rice Seeds" @default.
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• W2080494810 doi "https://doi.org/10.1104/pp.70.1.147" @default.
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