Abstract
Formate is the most targeted C1 building block and electron carrier in the post-petroleum era. Formate dehydrogenase (FDH), which catalyzes the production or degradation of formate, has acquired considerable attention. Among FDHs, a metal-dependent FDH that carries a complex active center, molybdenum-pterin cofactor, can directly transfer electrons from formate to other redox proteins without generating NAD(P)H. Previously, we reported an expression system for membrane-bound metal-dependent FDH from E. coli (encoded by the fdoG-fdoH-fdoI operon) and succeeded in its conversion to a soluble protein. However, this protein exhibited a too low stability to be purified and analyzed biochemically. In this study, we tried to improve the stability of heterologously expressed FDH through rational and irrational approaches. As a result, a mutant with the highest specific activity was obtained through a rational approach. This study not only yielded a promising FDH enzyme with enhanced activity and stability for industrial applications, but also offered relevant insights for the handling of recombinant large proteins.
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Fuji, R., Umezawa, K., Mizuguchi, M. et al. Protein Engineering of the Soluble Metal-dependent Formate Dehydrogenase from Escherichia coli. ANAL. SCI. 37, 733–739 (2021). https://doi.org/10.2116/analsci.20SCP15
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DOI: https://doi.org/10.2116/analsci.20SCP15