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CATH Superfamily 3.90.550.10

Spore Coat Polysaccharide Biosynthesis Protein SpsA; Chain A

The name of this superfamily has been modified since the most recent official CATH+ release (v4_3_0). At the point of the last release, this superfamily was named:

"
Spore Coat Polysaccharide Biosynthesis Protein SpsA; Chain A
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 25: Glycogenin-1 isoform 1

There are 1 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Glycogenin glucosyltransferase. [EC: 2.4.1.186]
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 EC 2.4.1.11.
  • 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 GDP-glucose.
  • 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 different organs.
  • 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 2.4.1.112.
 5 O08730 O15488 P13280 P46976 Q9R062