This is the N-terminal beta-sheet domain with jelly roll topology found in CE2 acetyl-esterase from the bacterium Clostridium thermocellum. This enzyme displays dual activities, it catalyses the deacetylation of plant polysaccharides and also potentiates the activity of its appended cellulase catalytic module through its noncatalytic cellulose binding function. This N-terminal jelly-roll domain appears to extend the substrate/cellulose binding cleft of the catalytic domain in C.thermocellum [1].

1: The active site of a carbohydrate esterase displays divergent catalytic and noncatalytic binding functions. Montanier C, Money VA, Pires VM, Flint JE, Pinheiro BA, Goyal A, Prates JA, Izumi A, Stalbrand H, Morland C, Cartmell A, Kolenova K, Topakas E, Dodson EJ, Bolam DN, Davies GJ, Fontes CM, Gilbert HJ; PLoS Biol. 2009;7:e71. PMID:19338387