Organic Co-solvents Affect Activity, Stability and Enantioselectivity of Haloalkane Dehalogenases
| Authors | |
|---|---|
| Year of publication | 2013 |
| Type | Article in Periodical |
| Magazine / Source | Biotechnology Journal |
| MU Faculty or unit | |
| Citation | |
| Doi | http://dx.doi.org/10.1002/biot.201200378 |
| Field | Biochemistry |
| Keywords | Haloalkane Dehalogenases |
| Description | Haloalkane dehalogenases are microbial enzymes with a wide range of biotechnological applications. The use of organic co-solvents to solubilize their hydrophobic substrates is often necessary. In order to choose the most compatible co-solvent, the effects of fourteen co-solvents on activity, stability and enantioselectivity of three model enzymes, DbjA, DhaA and LinB, were evaluated. All co-solvents caused at high concentration loss of activity and conformational changes. The highest inactivation was induced by tetrahydrofuran, while more hydrophilic co-solvents, such as ethylene glycol and dimethyl sulfoxide, were more tolerated. The effects of co-solvents at low concentration were different for each enzyme-solvent pair. The increase in DbjA activity was induced by the majority of organic co-solvents tested, while activities of DhaA and LinB decreased at comparable concentrations of the same co-solvent. Moreover, high increase of DbjA enantioselectivity was observed. Ethylene glycol and 1,4-dioxane were shown to have the most positive impact on the enantioselectivity. The favourable influence of the co-solvents on both activity and enantioselectivity makes DbjA suitable for biocatalytic applications. This study represents the first investigation of the effects of organic co-solvents on the catalytic performance of haloalkane dehalogenases and will pave the way for their broader use in industrial processes. |
| Related projects: |
|