Biocatalytic study of novel oleate hydratases

Publication date: Available online 16 January 2017 Source:Journal of Molecular Catalysis B: Enzymatic Author(s): Jens Schmid, Lisa Steiner, Silvia Fademrecht, Jürgen Pleiss, Konrad B. Otte, Bernhard Hauer The direct hydration of CC bonds to yield alcohols or the reverse dehydration is chemically challenging but highly sought after. Recently, oleate hydratases (OAHs) gained attention as biocatalytic alternatives capable of hydrating isolated, non-activated CC bonds. Their natural reaction is the conversion of oleic acid to (R)-10-hydroxystearic acid. In this work, we report the first comparative study of several OAHs. Therefore we established the Hydratase Engineering Database (HyED) comprising 2046 putative OAHs from eleven homologous families and selected nine homologs for cloning in E. coli. The heterologously expressed enzymes were evaluated concerning activity and substrate specificity. The enzymes have a broad substrate scope ranging from oleic acid (C18) to the novel synthetic substrate (Z)-undec-9-enoic acid (C11). The OAHs from Elizabethkingia meningoseptica and Chryseobacterium gleum showed the best expression, highest stability and broadest substrate scope, making them interesting candidates for directed evolution to engineer them for the application as general hydratase catalysts. Graphical abstract
Source: Journal of Molecular Catalysis B: Enzymatic - Category: Biochemistry Source Type: research