Starch Phosphorylase Inhibitor Is β-Amylase
نویسندگان
چکیده
منابع مشابه
Starch phosphorylase inhibitor from sweet potato.
A protein, starch phosphorylase inhibitor, was purified from the root of sweet potato (Ipomoea batatas [L.] Lam. cv Tainon 65). It had a molecular weight of 250,000 and could be composed of five identical subunits. The isoelectric point of the inhibitor was 4.63. It was a noncompetitive inhibitor toward the sweet potato enzyme with a K(i) value of 1.3 x 10(-6) molar when glucose-1-P was the var...
متن کاملStarch Phosphorylase of Potato
Cori and his colleagues (l-6) discovered and elucidated the series of reversible chemical reactions by which glucose is transformed into glycogen in animal tissues. These reactions are catalyzed by a group of enzymes, the most fundamental of which is phosphorylase, the enzyme which catalyzes the condensation of glucose-l-phosphate (Cori ester) to starch or glycogen. The properties of phosphoryl...
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The viscosimetric method of estimating enzyme concentration was first developed by Northrop and Hussey (1). In studies of the effect of irradiation of trypsin and pepsin solutions by Hussey and Thompson (2) certain modifications of the original methods were employed in order to decrease the opportunity for personal influence in curve plotting, as in extrapolation for the initial viscosity of th...
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Starches extracted from wrinkled (WP) and smooth (SP) peas were treated using β-amylase (B) alone and also with a combination of β-amylase and transglucosidase (BT). After enzymatic treatment, the proportions of slowly digested starch in WP-B, WP-BT, SP-B and SP-BT samples were increased by 6%, 9%, 9% and 12%, respectively. Starches treated by a combination of β-amylase and transglucosidase exh...
متن کاملThe gene structure of starch phosphorylase from sweet potato.
a-Glucan phosphorylases are of key importance among the enzymes controlling the entry of storage polysaccharides into the glycolytic pathway in microbes, animals, and plants. The enzymes catalyze the reversible phosphorolysis of cu-l,4-glucosidic linkages in glucan substrates. Among SP from higher plants, those from potato are best studied. They are classified into L and H types depending on th...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1988
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.88.4.1154