Members of this family assume a beta-sandwich structure composed of the eight antiparallel beta-strands. A ten residue linker is also present at the C-terminal end, which connects the N terminal domain to a distal domain in the protein. This domain participates in oligomerisation of the protein, wherein the N-terminal domain of one subunit contacts the active centre of the other subunit, and is also required for binding of cyclodextrin to substrate [1].

1: Covalent and three-dimensional structure of the cyclodextrinase from Flavobacterium sp. no. 92. Fritzsche HB, Schwede T, Schulz GE; Eur J Biochem. 2003;270:2332-2341. PMID:12752453