Sucrose, a major product of photosynthesis in green leaves, is synthesized by a battery of enzymes. the substrates for sucrose synthesis, d-glucose and d-fructose, are a mixture of α and β anomers as well as linear compounds in solution. nonetheless, sucrose consists of α-d-glucose linked by its carbon-1 atom to the carbon-2 atom of β-d-fructose. how can the specificity of the glycosidic bond in sucrose be explained in light of the structural diversity of the potential substrates for sucrose synthesis?

Sucrose is a disaccharide composed of alpha D gluose and beta D fructose linked together by beta 2,alpha1 glycosidic linkage.

Explanation:

The specificity of glycosidic linkage very much essential to choose the substrate for the synthesis of specific disaccharide.

 For example sucrose contain beta 2,alpha1 glycosidic linkage that means the hydroxyl group of anomeric carbon of one monosaccharide(fructose) should remain in beta conformation and the hydroxyl group of other monosaccharide(glucose) should remain in alpha conformation.