This family has structural similarity to an endo-1,3-1,4-beta glucanase belonging to glycoside hydrolase family 16. A member containing this domain, BT2157 from B. thetaiotaomicron [1], hydrolyses 3-ketotrehalose during trehalose degradation that proceeds through a 3-keto-glycoside intermediate. Other members containing this domain are involved in disaccharide catabolism with 3-ketoglycoside intermediates [1].

1: Functional genetics of human gut commensal Bacteroides thetaiotaomicron reveals metabolic requirements for growth across environments. Liu H, Shiver AL, Price MN, Carlson HK, Trotter VV, Chen Y, Escalante V, Ray J, Hern KE, Petzold CJ, Turnbaugh PJ, Huang KC, Arkin AP, Deutschbauer AM; Cell Rep. 2021;34:108789. PMID:33657378