ENZYME entry: EC 126.96.36.199
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|UDP-alpha-D-glucose + glycogenin <=> UDP + alpha-D-glucosylglycogenin|
- The first reaction of this enzyme is to catalyze its own
glucosylation, normally at a specific Tyr of the protein if this
group is free; when the Tyr is replaced by Thr or Phe, the enzyme's
self-glucosylation activity is lost but its intermolecular
transglucosylation ability remains.
- It continues to glucosylate an existing glucosyl group until a length
of about 5-13 residues has been formed.
- Further lengthening of the glycogen chain is then carried out by
- Not highly specific for the donor, using UDP-xylose in addition to
UDP-glucose (although not glucosylating or xylosylating a xylosyl
group so added).
- It can also use CDP-glucose and TDP-glucose, but not ADP-glucose or
- Similarly it is not highly specific for the acceptor, using water
(i.e. hydrolyzing UDP-glucose) among others.
- Various forms of the enzyme exist, and different forms predominate in
- Thus primate liver contains glycogenin-2, of molecular mass 66 kDa,
whereas the more widespread form is glycogenin-1, with a molecular
mass of 38 kDa.
- Formerly EC 188.8.131.52.
|PRIAM enzyme-specific profiles||184.108.40.206|
|KEGG Ligand Database for Enzyme Nomenclature||220.127.116.11|
|IUBMB Enzyme Nomenclature||18.104.22.168|
|MEDLINE||Find literature relating to 22.214.171.124|
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