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- W1966848448 abstract "A newly isolated soil-actinomycete, Actinomadura strain R10 (NRRL B-11411), produces an extracellular isomaltodextranase (optinal pH, 5.0) that was purified to homogeneity. It exolytically releases isomaltose and a minor trisaccharide product,α-d-Glcp-(1→3)-α-d-Glcp, from dextran B-512 and, in addition, forms transient transisomaltosylation products. This pattern of products is qualitatively similar to that previously reported for the isomaltodextranase (EC 3.2.1.94, optimal pH, 4-0) of Arthrobacter globiformis T6 (NRRL B-4425). The Arthrobacter isomaltodextranase is most active on the (1→6)-α-d-glucopyranosidic linkage, but the relative activity increases with the degrees of polymerization of isomalto-oligosaccharide substrates. In contrast, the relative activity of Actinomadura isomaltodextranase is almost constant throughout the same series of substrates, and is much higher on 3 O- and 4-O-α-isomaltosyl-oligosaccharides than that exhibited by the Arthrobacter enzyme; the activity of Actinomadura isomaltodextranase on the α-(1→4) linkage is 3-4 times greater than on the α-(1→6). These results indicate that, generically, the bacterial isomaltodextranase is a glycanase, whereas the actinomycetal enzyme is a glycosidase. This difference is reflected in the hydrolysis of dextrans, especially of dextran B-1355 (fraction S), which has a high content of unbranched α-(1→3) linked residues. In the digest of this dextran with Arthrobacter isomaltodextranse, short-chain fragments accumulated that were absent when the Actinomadura enzyme was employed." @default.
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- W1966848448 date "1981-03-01" @default.
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- W1966848448 title "Purification and some properties of the isomaltodextranase of Actinomadura strain r10 and comparison with that of Arthrobacter globiformis t6" @default.
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- W1966848448 doi "https://doi.org/10.1016/s0008-6215(00)85254-4" @default.
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