ORGANELLE MARKERS - Endoplasmic Reticulum

UDP-glucose

UDP-glucose: glycoprotein glucosyltransferase (UGGT) is a 170 kDa lumenal endoplasmic reticulum (ER) resident protein that catalyzes monoglucosylation of high mannose oligosaccharides. UGGT catalyzes the transfer of glucose from UDP-glucose to Man7-9GlcNAc2-moiety of unfolded glycoproteins in a Ca2+ dependent reaction. UGGT binds unfolded glycoprotein via two elements on its substrate: a N-acetylglucosamine unit on the oligosaccharide and hydrophobic amino acids that are exposed in the denatured conformation. It is postulated that UGGT serves as a sensor that is able to distinguish between folded and denatured protein in the ER.

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