Download MendeleyEngineering a Highly Efficient Carboligase for Synthetic One-Carbon Metabolism.
Nattermann, M., Burgener, S., Pfister, P., Chou, A., Schulz, L., Lee, S.H., Paczia, N., Zarzycki, J., Gonzalez, R., Erb, T.J.(2021) ACS Catal 11: 5396-5404
- PubMed: 34484855
- DOI: https://doi.org/10.1021/acscatal.1c01237
- Primary Citation of Related Structures:
7AYG, 7B2E - PubMed Abstract:
One of the biggest challenges to realize a circular carbon economy is the synthesis of complex carbon compounds from one-carbon (C1) building blocks. Since the natural solution space of C1-C1 condensations is limited to highly complex enzymes, the development of more simple and robust biocatalysts may facilitate the engineering of C1 assimilation routes. Thiamine diphosphate-dependent enzymes harbor great potential for this task, due to their ability to create C-C bonds. Here, we employed structure-guided iterative saturation mutagenesis to convert oxalyl-CoA decarboxylase (OXC) from Methylobacterium extorquens into a glycolyl-CoA synthase (GCS) that allows for the direct condensation of the two C1 units formyl-CoA and formaldehyde. A quadruple variant MeOXC4 showed a 100 000-fold switch between OXC and GCS activities, a 200-fold increase in the GCS activity compared to the wild type, and formaldehyde affinity that is comparable to natural formaldehyde-converting enzymes. Notably, MeOCX4 outcompetes all other natural and engineered enzymes for C1-C1 condensations by more than 40-fold in catalytic efficiency and is highly soluble in Escherichia coli . In addition to the increased GCS activity, MeOXC4 showed up to 300-fold higher activity than the wild type toward a broad range of carbonyl acceptor substrates. When applied in vivo, MeOXC4 enables the production of glycolate from formaldehyde, overcoming the current bottleneck of C1-C1 condensation in whole-cell bioconversions and paving the way toward synthetic C1 assimilation routes in vivo.
Organizational Affiliation:
Department of Biochemistry & Synthetic Metabolism, Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch-Str. 10, 35043 Marburg, Germany.
