Abstract
Due to its enhanced energy content and hydrophobicity, isobutanol is flagged as a next generation biofuel and chemical building block. For cellular and cell-free isobutanol production, NADH dependent (over NADPH dependent) enzyme systems are desired. To improve cell-free isobutanol processes, we characterized and catalytically optimized a NADH dependent, thermo- and solvent stable ketol-acid reductoisomerase (KARI) derived from the bacterium Meiothermus ruber (Mr). The wild type Mr-KARI has the most temperature tolerant KARI specific activity reported to date. The KARI screening procedure developed in this study allows accelerated molecular optimization. Thus, a KARI variant with a 350% improved activity and enhanced NADH cofactor specificity was identified. Other KARI variants gave insights into Mr-KARI structure-function relationships.
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