Judy Boland, Amber Henry, Nicolas Caffarelli, Gordon Nicol, Jeffrey L. Turner, Kevin Ray
MilliporeSigma, A business of Merck KGaA, Darmstadt, Germany
Comparison of PNGase F workflows for glycan release. The traditional workflow (top) involves multiple wash steps and an overnight digestion. With PNGase Fast (bottom), digestion is complete in 15 minutes with minimal washes. Released glycans were labeled with procainamide by reductive amination and analyzed by LC-FL-MS.
Left: Traditional overnight deglycosylation of bovine acid glycoprotein by PNGase F Right: PNGase Fast deglyocosylation of bovine acid glycoprotein in 20 minutes
Deglycosylation of non-reduced (left two lanes) vs reduced (right two lanes) RNase B protein using Fast PNGase protocol. Reduction greatly enhances the deglycosylation of this protein.
RNAse B (R7884) was denatured with or without βME before deglycosylating using the fast protocol. Deglycosylated protein was recovered from the filter and analyzed by electrophoresis on a 4 - 20% Tricine gel and stained with EZBlue™ (G1041).
Glycan species recovered from reducing fast protocol (blue) compared to non-reducing protocol (red) and traditional overnight protocol (green). Reduction does not appear to be necessary for this monoclonal antibody.
Distribution of glycans recovered from Cetuximab monoclonal antibody when digesting with PNGase Fast protocol, with or without reduction, compared to conventional overnight digestion after denaturing with guanidine-HCl.
Legend of glycan sugars and corresponding masses used to determine overall glycan species putative structure.
Glycan species recovered from fast protocol using 30kDa MWCO Amicon filter (blue) compared to glycans recovered from 30kDa MWCO Microcon filter (red) and 10kDa MWCO Amicon filter (green). Some changes in glycan profile are observed with the 10 kDa MWCO filter, therefore the 30 kDa filters are recommended.
SILu™Lite SigmaMAb universal human IgG standard (MSQC4) was deglycosylated with PNGase Fast using ultra filters with differing MWCO for detergent removal and glycan recovery.
Glycans released by fast protocol and recovered from 30kDa MWCO Amicon filter using 1 µL of PNGase F (blue), compared to glycans recovered from 30kDa MWCO Amicon filter using 2 µL of PNGase F (red), glycans recovered using 30kDa MWCO Microcon filter using 2 µL of PNGase F (green), and glycans recovered from 10kDa MWCO Amicon filter using 2 µL of PNGase F (purple). In all cases, the recovered glycan profile is similar. PNGase Fast Kit includes 50 µL of PNGase F enzyme, sufficient for about 50 reactions with 100 µg glycoprotein.
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