Abstract
Cellobiose dehydrogenase (CDH; EC 1.1.99.18) is an extracellular glycosylated protein composed of two distinct domains, a C-terminal catalytic flavin domain and an N-terminal cytochrome-b-type heme domain, which transfers electrons from the flavin domain to external electron acceptors. The soluble flavin domain of the Phanerochaete chrysosporium CDH was successfully expressed in Escherichia coli. The enzyme showed dye-mediated CDH activity higher than that of the complete CDH, composed of flavin domain and heme domain, prepared using Pichia pastoris as the host microorganism. The ability to conveniently express the recombinant CDH flavin domain in E. coli provides great opportunities for the molecular engineering of the catalytic properties of CDH.
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