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Sign in New account. Remember me. Log in. By registering, you're agreeing to our Terms and Conditions. Create account. Cohen, S. Nature of the salt dependence of the envelope of a Dead Sea archaebacterium, Haloferax volcanii.
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Rinke, C. One of the main function of glycoproteins on the cell membrane is to stabilize the membrane by making hydrogen bonds with the surrounding water molecules.
On the other hand, glycoproteins on the cell membrane and in the blood serve as antigens, facilitating cell recognition as either self or non-self. Glycoproteins on the cell membrane also play a role in cell attachment. In addition, glycoproteins serve as receptor molecules for hormones and neurotransmitters, triggering intercellular signaling pathways.
Figure 2: Glycoproteins in the Cell Membrane. Moreover, glycoproteins are a diverse group of molecules. Some examples of glycoproteins are collagen, a structural molecule, mucins that are lubricants, transport molecules such as transferrin, immunologic molecules such as immunoglobulins and histocompatibility antigens, hormones such as HCG and TSH, etc. Peptidoglycan refers to a substance that forms the cell walls of many bacteria, consisting of glycosaminoglycan chains interlinked with short peptides while glycoprotein refers to any of a class of proteins which have carbohydrate groups attached to the polypeptide chain.
Thus, this is the main difference between peptidoglycan and glycoprotein. Furthermore, peptidoglycan is a polymer while glycoprotein is not a polymer. Peptidoglycan is composed of NAG, NAM attached to N-acetylmuramic acid while a glycoprotein is composed of oligosaccharide chains attached to a protein. Hence, this is an important difference between peptidoglycan and glycoprotein.
Moreover, the sugars in peptidoglycans are not available elsewhere while the sugars in glycoproteins naturally occur in the other biological systems as well. Also, proteins do not occur in peptidoglycans while proteins occur in glycoproteins.
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