This domain is found at the C-terminal end of BT1760 from Bacteroides thetaiotaomicron and similar bacterial proteins that predominantly belong to the glycoside hydrolase family 32 (GH32). BT1760 is an endo-levanase that requires its C-terminal beta-sandwich domain to fold and function correctly. This domain shows two facing beta-sheets consisting of seven and eight antiparallel beta-strands [1].

1: First crystal structure of an endo-levanase - the BT1760 from a human gut commensal Bacteroides thetaiotaomicron. Ernits K, Eek P, Lukk T, Visnapuu T, Alamae T; Sci Rep. 2019;9:8443. PMID:31186460