Enables beta-fructofuranosidase activity and oligo-1,6-glucosidase activity. Involved in several processes, including response to fructose; response to sucrose; and response to vitamin A. Located in brush border and membrane raft. Biomarker of colitis. Human ortholog(s) of this gene implicated in congenital sucrase-isomaltase deficiency. Orthologous to human SI (sucrase-isomaltase). [provided by Alliance of Genome Resources, Apr 2022]