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Cytochrome p450 BM-3 (EC catalyzes the hydroxylation and/or epoxidation of a broad range of substrates, including alkanes, alkenes, alcohols, fatty acids, amides, polyaromatic hydrocarbons, and heterocycles. For many of these notoriously water-insoluble compounds, p450 BM-3's K(m) values are in the millimolar range. Polar organic cosolvents are(More)
Progress in miniature chip-design raises demands for implantable power sources in health care applications such as continuous glucose monitoring of diabetic patients. Pioneered by Adam Heller, miniaturized enzymatic biofuel cells (mBCs) convert blood sugars into electrical energy by employing for example glucose oxidase (GOx) on the anode and bilirubin(More)
We have developed a statistical method named MAP (mutagenesis assistant program) to equip protein engineers with a tool to develop promising directed evolution strategies by comparing 19 mutagenesis methods. Instead of conventional transition/transversion bias indicators as benchmarks for comparison, we propose to use three indicators based on the subset of(More)
BACKGROUND Channel proteins like the engineered FhuA Δ1-159 often cannot insert into thick polymeric membranes due to a mismatch between the hydrophobic surface of the protein and the hydrophobic surface of the polymer membrane. To address this problem usually specific block copolymers are synthesized to facilitate protein insertion. Within this study in a(More)
Bacillus gibsonii Alkaline Protease (BgAP) is a recently reported subtilisin protease exhibiting activity and stability properties suitable for applications in laundry and dish washing detergents. However, BgAP suffers from a significant decrease of activity at low temperatures. In order to increase BgAP activity at 15°C, a directed evolution campaign based(More)
Proteases have niche applications in diagnostic kits that use cell lysis and thereby require high resistance towards chaotropic salts and detergents, such as guanidinium chloride (GdmCl) and sodium dodecylsulfate (SDS). Subtilisin E, a well-studied serine protease, was selected to be re-engineered by directed evolution into a "chaophilic" protease that(More)
Proteases are industrially important enzymes but often have to be improved for their catalytic efficiency and stabilities to suit applications. Flow cytometry screening technology based on in vitro compartmentalization in double emulsion had been developed and applied on directed evolution of paraoxonase and β-galactosidase. Further advancements of flow(More)
The field of directed evolution of oxygenases (mono-, di- and epoxygenases) is rapidly advancing as an increasing number of success stories indicate. A significant number of screening systems have been developed to specifically improve oxygenase properties. Oxygenases will become very valuable biocatalysts for synthetic applications in industry when(More)
Directed evolution of Yersinia mollaretii phytase (Ymphytase) yielded an improved variant SM2P3E4 (also named M1; D52N, T77K, K139E, G187S, V298M) in our previous study. Variant M1 retained high specific activity (993U/mg; equivalent to 93% of wild-type activity) and improved thermal resistance (T50 improved by 1.5°C compared to wild-type at 58°C; 20min(More)