Enzymatic deglycosylation of glycoprotein

Cyril S Roberts robby at iastate.edu
Sat Jun 18 14:26:15 EST 1994

I have been trying to deglycosylate Chlamydomonas reinhardtii periplasmic
carbonic anhydrase, using Glycopeptidase F (E.C. 32.2.18 or from
SIGMA.  So far I haven't been able to get it work.  This glycoprotein is a
heterotetramer, with a number of N-asparagine linked oligosaccharides on two
of the subunits.

Essentially, I treat the protein with DTT, then boil with SDS to denature
it.  I then incubate in 250 mM sodium phosphate buffer, along with
glycopeptidase, overnite at 37 degree centigrade.  Subsequent SDS-PAGE does
not reveal any effect of the enzyme.  I'd be happy to supply any further
details as may be required for constructive criticism. 

I would appreciate any comments or suggestions that may facilitate


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