Normally glycan cannot be found independently in nature, they will be branched either with proteins known as glycol proteins or branched with lipids called as glycolipids. Glycobiology is an interesting and very complex study when compared to other studies because such complexity cannot be seen in other studies. Molecules for Protein, RNA, DNA, lipids and sugar linkages found in saccharides provide the important structural basis for molecules. These 68 building blocks form an entire life of cell, nucleosides (RNA) or nucleotides (DNA) have four blocks each. Lipids are constituted of 8 categories, which are divided on the basis of Ketoacyl and isoprene. 20 different amino acids and 32 sugar linkages found in saccharides. These all increase the complexity more.
Adding to the complexity many proteins are seen to be involved with glycans, these not only act as carriers of carbohydrates. In some cases these proteins also involves in reacting with carbohydrates.To understand glycans better we should understand the roles of glycans, Glycoproteins is one form of glycans these are found on cell surface playing a vital role of recognition.
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