This family represents the C-terminus (approximately 60 residues) of plant xyloglucan endo-transglycosylase (XET). Xyloglucan is the predominant hemicellulose in the cell walls of most dicotyledons. With cellulose, it forms a network that strengthens the cell wall. XET catalyses the splitting of xyloglucan chains and the linking of the newly generated reducing end to the non-reducing end of another xyloglucan chain, thereby loosening the cell wall [1]. Note that all family members contain the Pfam:PF00722 domain.

1: Biochemical and molecular characterisation of xyloglucan endotransglycosylase from ripe kiwifruit. Schroder R, Atkinson RG, Langenkamper G, Redgwell RJ; Planta 1998;204:242-251. PMID:9487728