N-termini acetylation for secondary amines

antony 94221532 at HERMES.USHERB.CA
Mon Nov 9 15:47:13 EST 1998

I am using an unknown amount of proteins in the middle of which i have a 
peptide to acetylate. This peptide is covalently linked to another. I want 
to acetylate this peptide in its N-termini but this N-termini as a 
secondary amine (sarcosine (N-methyl glycine)). We have been using Sulfo NHS 
Acetate (Pierce) which is a compound that acetylates primary amines but the 
yield of the reaction is either unsufficient and unsatisfying. Would you 
happen to know any other way of acetylating proteins to give a tertiary 
amine at the n-terminal considering that it is impossible to purify the mix 
proteins. The reason we are doing this is to block the N-termini to be able 
to proceed for Edman degradation which will degrade the covalently bound 
protein but not the peptide. Thanx 

Antony BOUCARD M. Sc Pharmacology 
University of Sherbrooke, Canada 

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