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- W2014187550 abstract "There are low-Mr (72,700) and high-Mr (330,000) soluble α-glucosidase activities in the hind-midgut of Musca domestica that can be isolated by ultracentrifugation. The low-Mr α-glucosidase is less stable and less inhibited by Tris than is the high-Mr α-glucosidase, and occurs mainly in hind-midgut contents, whereas the high-Mr α-glucosidase is found only in hind-midgut cells. Subcellular fractionation of hind-midgut cells showed that the high-Mr α-glucosidase is associated mainly with brush-borders, from where it is set free by freezing and thawing. The low-Mr α-glucosidase is recovered chiefly in the soluble fraction of the cell. The data suggest that the high-Mr and the low-Mr α-glucosidase occur mainly tightly and loosely bound to the cell glycocalyx, respectively. Based on subcellular fractionation, ultracentrifugation, and thermal inactivation data, there is only one molecular species of α-glucosidase and glucoamylase, which are solubilized by Triton X-100 from hind-midgut cell microvillar membranes. The results suggest that starch digestion is accomplished stepwise by luminal amylase, then by membrane-bound glucoamylase, and finally by glycocalyx-associated α-glucosidase and membrane-bound α-glucosidase. Luminal α-glucosidase probably digests ingested oligomaltodextrins and, since it is significantly excreted, it may also be involved in extracorporeal digestion." @default.
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- W2014187550 title "Final digestion of starch in Musca domestica larvae. Distribution and properties of midgut α-d-glucosidases and glucoamylase" @default.
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- W2014187550 doi "https://doi.org/10.1016/0020-1790(89)90074-7" @default.
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