Identification of the galactitol dehydrogenase, LadB, that is part of the oxido-reductive d-galactose catabolic pathway in Aspergillus niger

► Identification in Aspergillus niger of a galactitol dehydrogenase, LadB. ► LadB is part of the oxido reductive d-galactose pathway producing l-xylo-3-hexulose. ► In A. niger this pathway is the main pathway for d-galactose catabolism. ► The first step of this pathway is catalysed by d-xylose reductase. ► The Leloir pathway seems to be not functional.