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Cellulosomes are cell-bound multienzyme complexes secreted by anaerobic bacteria that play a crucial role in carbon turnover by degrading plant cell walls to simple sugars. Integration of cellulosomal components occurs via highly ordered protein-protein interactions between cohesin modules located in a molecular scaffold and dockerin modules found in cellulosomal enzymes. Acetivibrio cellulolyticus possesses a complex cellulosome arrangement which is organized by a primary enzyme-binding scaffoldin (ScaA), two anchoring scaffoldins (ScaC and ScaD) and an unusual adaptor scaffoldin (ScaB). A dockerin from a family 5 glycoside hydrolase (GH5), which was engineered to inactivate one of the two putative cohesin-binding interfaces, complexed with one of the ScaA cohesins from A. cellulolyticus has been purified and crystallized, and data were processed to a resolution of 1.57 Å in the orthorhombic space group P212121.

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