CBM21 (carbohydrate binding type-21) domain (IPR005036)

Short name: CBM21_dom

Overlapping homologous superfamilies

Domain relationships



The carbohydrate binding type-21 or CBM21 domain is a 90-130 amino acid carbohydrate binding domain. The domain is named after proteins classified in carbohydrate-binding module (CBM) family 21 and is sometimes called starch-binding domain (SBD) [PMID: 15939348]. The CBM21 domain occurs in several eukaryotic proteins implicated in glycogen metabolism. A glucoamylase active site region or alpha amylase catalytic domain can occur C-terminal to the CBM21 domain. The CBM21 domain of Rhizopus oryzae glucoamylase can bind to raw starch. Most conserved residues are located in a region with a length of 35 in the N-terminal part [PMID: 9046081] and in a 15-25 residue motif II at the C terminus of the domain [PMID: 9046081, PMID: 9045612, PMID: 16262690].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0005515 protein binding

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles