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Glycosylation also plays a role in cell-to-cell adhesion (a mechanism employed by cells of the immune system) via sugar-binding proteins called lectins, which recognize specific carbohydrate moieties. [2] Glycosylation is an important parameter in the optimization of many glycoprotein-based drugs such as monoclonal antibodies. [6]
Two-hybrid screening (originally known as yeast two-hybrid system or Y2H) is a molecular biology technique used to discover protein–protein interactions (PPIs) [1] and protein–DNA interactions [2] [3] by testing for physical interactions (such as binding) between two proteins or a single protein and a DNA molecule, respectively.
Yeast estrogen screen (YES) and Yeast androgen screen (YAS) are in vitro screens that have been developed in order to detect estrogenic and androgenic activities, respectively, of natural and synthetic compounds, mixtures and environmental samples.
Nucleotide sugar metabolism is particularly well-studied in yeast, [5] fungal pathogens, [6] and bacterial pathogens, such as E. coli and Mycobacterium tuberculosis, since these molecules are required for the synthesis of glycoconjugates on the surfaces of these organisms.
However, when increased glycosylation abilities are employed, hyper-mannosylation, or the addition of a large number of mannose, is often observed. This hinders proper protein folding. Overall, yeast is a compromise between bacterial and mammalian cells, and remains a popular host system.
N-Linked glycosylation involves oligosaccharide attachment to asparagine via a beta linkage to the amine nitrogen of the side chain. [7] The process of N -linked glycosylation occurs cotranslationally, or concurrently while the proteins are being translated.
O-linked glycosylation is the attachment of a sugar molecule to the oxygen atom of serine (Ser) or threonine (Thr) residues in a protein. O -glycosylation is a post-translational modification that occurs after the protein has been synthesised.
The study of the glycosylation of proteins is important to understanding certain diseases, like cancer, because a connection between a change in glycosylation and these diseases has been discovered. To study this post-translational modification of proteins, advanced mass spectrometry techniques based on glycoproteomics have been developed to ...