Lane 1 – MW markers; Lane 2 – ab83991; Lane 3 – ab83991 treated with PNGase F to remove potential N-linked glycans; Lane 4 – ab83991 treated with a glycosidase cocktail to remove potential N- and O-linked glycans. 10 µg protein loaded per lane; Deep Purple™ stained. Drop in MW after treatment with PNGase F indicates presence of N-linked glycans. Additional bands in lane 3 and lane 4 are glycosidase enzymes.
Post-translational modifications result in protein heterogeneity. The densitometry scan demonstrates the purified human cell expressed protein exists in multiple isoforms, which differ according to their level of post-translational modification. Triangle indicates theoretical pI and MW of the protein.