Cellobionic acid phosphorylase NCU09425 (CAP). a In vitro activity assay of purified intracellular β-glucosidase gh1-1 (NCU00130) on cellobionic acid. The purified NCU00130 was omitted in the ‘control’ condition. b In vitro activity assay of purified NCU09425 (CAP) and Saccharophagus degradans cellobiose phosphorylase (SdCBP) on cellobionic acid and cellobiose. A2 cellobionic acid, G2 cellobiose.