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By: Richard D. Cummings I am not aware of studies that have directly and quantitatively determined the number of glycoprotein molecules in a cell or the actual number of N-glycan molecules expressed within the glycoproteins in a cell. N-glycans are those linked to asparagine (Asn) residues in the...

By: Richard D. Cummings In plants, glucose is produced from carbon dioxide (CO 2) and water through photosynthesis, which generates oxygen (O 2) as a byproduct. Without sunlight/photosynthesis, the Calvin Cycle, along with probably the most important enzyme in the world - RuBisCo (Ribulose-1,5...

By: Richard D. Cummings Until a few years ago it was believed that mitochondria do not contain glycoproteins. However, mitochondria contain a variant form of the enzyme UDP-GlcNAc: polypeptide O-β-N-acetylglucosaminyltransferase (OGT) that adds O-GlcNAc to Ser/Thr residues of proteins in...