Microbial α-amylase (None universally standardized; "α-amylase" or simply "amylase" are sometimes used, but in microbial context, "microbial α-amylase" is preferred)

Microbial α-amylase is an extracellular enzyme produced by various bacteria and fungi, belonging to the 1,4-α-D-glucan glucanohydrolase class (EC 3.2.1.1). It catalyzes the hydrolysis of internal α-1,4-glycosidic bonds in starch and other related polysaccharides, breaking down complex carbohydrates into smaller oligosaccharides such as maltose, maltotriose, and dextrins. The enzyme requires calcium ions for stability and activity, and often contains a (β/α)_8 TIM-barrel catalytic core. Microbial α-amylases play central roles in industrial processes, including starch processing (for food, beverage, brewing, detergent, and textile industries) due to their robust and diverse enzymatic properties and their ability to function in extreme conditions. They are also utilized as diagnostic markers for microbial contamination and have specialized applications in biotechnology and research. While sharing core activity with mammalian amylases, microbial forms are distinguished by their genetic origin, biochemical properties, substrate specificity, and industrial relevance.

Other names

α-amylasealpha-amylase1,4-α-D-glucan glucanohydrolase (EC 3.2.1.1)bacterial amylasefungal amylase

Hydrolyzes α-1,4-glycosidic bonds in starch, producing oligosaccharides (such as maltose and maltotriose) Acts at random locations within polysaccharide chains (endo-acting), as opposed to exo-acting amylases