GlcN causes increased O-GlcNAcylation primarily in the cytosolic and nuclear fractions.
A, The effect of GlcN treatment on O-GlcNAc, OGT, and OGA protein levels in different subcellular fractions. CTD110.6 (anti-O-GlcNAc) Western blot of total lysate, crude mitochondrial, nuclear, and cytosolic fractions for control (−) and GlcN-treated (+) samples. Loading controls MEK1/2, COX IV and Nup 62 correspond to cytosolic, mitochondrial, and nuclear markers, respectively. B, mRNA regulation of OGT and OGA determined using Affymetrix arrays.