α-1,4-glycosidic bond

The **α-1,4-glycosidic bond** is a type of covalent chemical linkage that joins two monosaccharide units—specifically glucose molecules—in many biologically important polysaccharides. This bond forms between the anomeric carbon (C1) of one α-D-glucose and the C4 hydroxyl group of another glucose molecule. It is a defining structural feature in major carbohydrates such as starch (amylose and amylopectin), glycogen, and some regions of cellulose[3][6][9]. The formation of this bond occurs through a condensation reaction catalyzed by specific enzymes like glycogen synthase or starch synthase[2][6]. Its hydrolysis—breaking the bond—is catalyzed by enzymes such as **α-amylase**, which plays a key role in carbohydrate digestion by cleaving these bonds to release smaller sugars for metabolism[5][8]. **α-1,4-glycosidic bonds themselves are not therapeutic targets**; rather, they are structural features within larger biomolecules. Enzymes that form or break these bonds can be therapeutic targets or have clinical significance—for example, deficiencies in enzymes processing these linkages can lead to metabolic disorders like glycogen storage diseases[2]. Thus, while crucial for biology and medicine due to their presence in energy-storage molecules and dietary carbohydrates[3], the α-1,4-glycosidic bond is not itself considered a drug target but rather an important chemical motif within target macromolecules. **Note:** This entry describes a chemical linkage rather than a discrete protein or receptor; therefore it does not fit standard definitions for molecular drug targets such as receptors or enzymes.

Other names

alpha-1,4-glycosidic linkage1,4-alpha-glucosidic bondα(1→4) glycosidic bond