Subunit of fructose dehydrogenase, an enzyme that catalyzes the oxidation of D-fructose to produce 5-keto-D-fructose. Heterotrimer composed of FdhL, FdhS and FdhC. Predicted to be exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven. This enzyme is commonly used in a number of research projects to examine the electrochemical properties of enzyme-catalyzed electrode reactions, named bioelectrocatalysis. Available as a commercial product from Sigma Aldrich (catalog number F4892). Belongs to the FAD containing D-sorbitol dehydrogenase family.