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Maltase (EC 22.214.171.124, alpha-glucosidase, glucoinvertase, glucosidosucrase, maltase-glucoamylase, alpha-glucopyranosidase, glucosidoinvertase, alpha-D-glucosidase, alpha-glucoside hydrolase, alpha-1,4-glucosidase, alpha-D-glucoside glucohydrolase) is an enzyme that breaks down the disaccharide maltose. Maltase catalyzes the hydrolysis of maltose to the simple sugar glucose. This enzyme is found in plants, bacteria, and yeast. Acid maltase deficiency is categorized into three separate types based on the age of onset of symptoms in the affected individual.
In most cases, it is equivalent to alpha-glucosidase, but the term "maltase" emphasizes the disaccharide nature of the substrate from which glucose is cleaved, and "alpha-glucosidase" emphasizes the bond, whether the substrate is a disaccharide or polysaccharide.
In humans, maltase will break down the alpha form of the maltose. Humans are only able to break down the alpha forms of carbohydrates.
See also 
- "Maltase - Definition from the Merriam-Webster Online Dictionary". Retrieved 2009-04-06.
- Bruni, C.B., Sica, V., Auricchio, F. and Covelli, I. (1970). "Further kinetic and structural characterization of the lysosomal α-D-glucoside glucohydrolase from cattle liver". Biochim. Biophys. Acta 212: 470–477. PMID 5466143.
- Flanagan, P.R. and Forstner, G.G. (1978). "Purification of rat intestinal maltase/glucoamylase and its anomalous dissociation either by heat or by low pH". Biochem. J. 173: 553–563. PMID 29602.
- Larner, J. (1960). "Other glucosidases". In Boyer, P.D., Lardy, H. and Myrbäck, K. The Enzymes 4 (2nd ed.). New York: Academic Press. pp. 369–378.
- Sivikami, S. and Radhakrishnan, A.N. (1973). "Purification of rabbit intestinal glucoamylase by affinity chromatography on Sephadex G-200". Indian J. Biochem. Biophys. 10: 283–284. PMID 4792946.
- Sørensen, S.H., Norén, O., Sjöström, H. and Danielsen, E.M. (1982). "Amphiphilic pig intestinal microvillus maltase/glucoamylase. Structure and specificity". Eur. J. Biochem. 126: 559–568. PMID 6814909.
- Maltases at the US National Library of Medicine Medical Subject Headings (MeSH)
- Structure and evolution of the mammalian maltase-glucoamylase and sucrase-isomaltase
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