Acylation of Ser

[JAB5 at VAX.YORK.AC.UK]

Dear colleagues,
I remember something about N-terminal Serines which become acylated
(possibly an alcohol or aldehyde dehydrogenase example?) but can't
recall much else.
What does this really mean? Where does the acyl group come from?
Is there a known physiological role/mechanism for this?
Any help or pointers to the lit. would be much appreciated.
Many thanks,

Jim Brannigan
Chemistry dept.,
University of York

Vax jab5 at uk.ac.york.vax
Unix jab at uk.ac.york.yorvic