Spirochaeta thermophila secretes seven glycoside hydrolases for plant biomass degradation that carry a carbohydrate-binding module 64 (CBM64) appended at the C-terminus. CBM64 adsorbs to various beta1-4-linked pyranose substrates and shows high affinity for cellulose. Structure analysis indicates a jelly-roll-like fold corresponding to a surface-binding type A CBM [1].

1: Structural basis for cellulose binding by the type A carbohydrate-binding module 64 of Spirochaeta thermophila. Schiefner A, Angelov A, Liebl W, Skerra A; Proteins. 2016;84:855-858. PMID:26868291