Fig. 7From: Highly selective whole-cell 25-hydroxyvitamin D3 synthesis using molybdenum-dependent C25-steroid dehydrogenase and cyclodextrin recyclingProposed model for the whole-cell synthesis of VitD3 in S25DH1-producing T. aromatica. The preVitD3 form is favoured in the presence of HPCD and proposed to be the actual substrate of S25DH1. It is unclear whether the preVitD3/HPCD complex can pass the outer membrane through porinsBack to article page