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A gene coding for a putative α-glucosidase has been identified in the open reading frameyvdL (now termedmalL ), which was sequenced as part of theBacillus subtilis genome project. The enzyme was overproduced inEscherichia coli and purified. Further analyses indicate that MalL is a specific oligo-1,4-1,6-α-glucosidase (sucrase-maltase-isomaltase). MalL expression inB. subtilis requires maltose induction and is subject to carbon catabolite repression by glucose and fructose. Insertional mutagenesis ofmalL resulted in a complete inactivation of the maltose-inducible α-glucosidase activity in crude protein extracts and a Mal− phenotype.

Identification and Enzymatic Characterization of the Maltose-Inducible α-Glucosidase MalL (Sucrase-Isomaltase-Maltase) of Bacillus subtilis