This domain is found at the C terminal of cellulases and in vitro binding studies have shown it to binds to crystalline cellulose [1].

1: A Tomato Endo-beta-1,4-glucanase, SlCel9C1, Represents a Distinct Subclass with a New Family of Carbohydrate Binding Modules (CBM49). Urbanowicz BR, Catala C, Irwin D, Wilson DB, Ripoll DR, Rose JK; J Biol Chem. 2007;282:12066-12074. PMID:17322304