Biocatalysis utilizes the catalytic potential of enzymes either in the isolated state or in whole cells to produce ne or bulk chemicals for the pharmaceutical and chemical industry. It represents a strongly expanding eld, especially, as the number of available enzymes catalyzing industrially relevant reactions and the knowledge about the metabolic pathways involved in biocatalytic processes is rapidly increasing. Enzymes catalyze a huge variety of reactions in order to synthesize the building blocks and to generate the energy necessary for growth and proliferation of living organisms.