Melibiose and related carbohydrates

Melibiose is a reducing disaccharide formed by an alpha-1,6-linkage between D-galactose and D-glucose. It is not a therapeutic target in the traditional sense (such as a receptor or enzyme) but is rather a carbohydrate substrate found in plants and processed by microbial flora in the human gut. In humans, the related enzyme alpha-galactosidase A is responsible for breaking down similar alpha-galactosyl linkages in glycosphingolipids; a deficiency in this enzyme leads to Fabry disease, a lysosomal storage disorder. While melibiose itself is used in diagnostic microbiology to differentiate bacterial species based on fermentation patterns, therapeutic interventions focus on the enzymes and transporters that handle such sugars rather than the sugars themselves. Consequently, this entry represents a class of chemical compounds rather than a distinct protein target for drug development.

Other names

6-O-α-D-galactopyranosyl-D-glucoseα-D-Gal-(1→6)-D-GlcMelibioseGalactosyl-glucose

Drugs do not typically target melibiose itself; rather, recombinant enzymes (Agalsidase) are used to replace the activity of α-galactosidase A to degrade related glycosphingolipids, or pharmacological chaperones (Migalastat) are used to stabilize the endogenous enzyme.