Section 5
Chapter 4,702

Alpha d glucosidase ec in the mid gut of the american cockroach periplaneta americana

Katagiri, C.

Insect Biochemistry 9(2): 205-210


Accession: 004701033

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A sugar hydrolyzing enzyme was purified from the midgut of the American cockroach by DEAE-cellulose and affinity column chromatography. Examination of its substrate specificity showed that this enzyme is an .alpha.-D-glucosidase (EC Purified enzyme preparation exhibited a high degree of homogeneity on an acrylamide gel. The preparation was still contaminated with other glycosidases such as trehalase (EC, .beta.-D-glucosidase (EC or .alpha.-amylase (EC The isoelectric point of the enzyme was very low, pH 3.54, the pH optimum was 5.8 and the Km value was 5.0 mM for p-nitrophenyl-.alpha.-D-glucopyranoside. The characteristics show that the midgut .alpha.-D-glucosidase was distinct from the serum of .alpha.-D-glucosidase.

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