Anti-SI Antibody Picoband®

This gene is mapped to 3q26.1. It encodes a sucrase-isomaltase enzyme that is expressed in the intestinal brush border. The encoded protein is synthesized as a precursor protein that is cleaved by pancreatic proteases into two enzymatic subunits sucrase and isomaltase. These two subunits heterodimerize to form the sucrose-isomaltase complex. This complex is essential for the digestion of dietary carbohydrates including starch, sucrose and isomaltose. Mutations in this gene are the cause of congenital sucrase-isomaltase deficiency.

Expressed in the poorly differentiated crypt cells of the small intestine as well as in the mature villous cells. Expressed at very low levels in the colon.

Angiogenesis, Cancer, Cardiovascular, Growth Factors, Growth Factors/Hormones, Invasion/Microenvironment, Neurogenesis, Neurology Process, Neuroscience, Signal Transduction

Plays an important role in the final stage of carbohydrate digestion. Isomaltase activity is specific for both alpha-1,4- and alpha-1,6-oligosaccharides.

1. Birkenmeier, E. H., Rowe, L. B., Leeper, L. L., Henning, S. J. The sucrase-isomaltase structural gene (Si-s) and a regulatory gene (Si-r) are closely linked to esterase-26 (Es-26) on mouse chromosome 3. Mammalian Genome 4: 531-536, 1993. 2. Chantret, I., Lacasa, M., Chevalier, G., Ruf, J., Islam, I., Mantei, N., Edwards, Y., Swallow, D., Rousset, M. Sequence of the complete cDNA and the 5-prime structure of the human sucrase-isomaltase gene: possible homology with a yeast glucoamylase. Biochem. J. 285: 915-923, 1992. 3. Davis, M. B., Green, F. R., West, L. F., Kearney, A., Povey, S., Swallow, D. M. Mapping of the gene encoding human sucrase-isomaltase (SI) to chromosome 3q25-26. (Abstract) Cytogenet. Cell Genet. 46: 604, 1987.

Store at -20°C for one year from date of receipt. After reconstitution, at 4°C for one month. It can also be aliquotted and stored frozen at -20°C for six months. Avoid repeated freeze-thaw cycles.