C1 biochemistry: how microbes turn single-carbon molecules into products
C1 biochemistry is the microbial conversion of single-carbon molecules, carbon dioxide, carbon monoxide, methane, and methanol, into useful products. Some microbes do this naturally; synthetic biology is engineering the ability into industrial strains. It matters because it offers a path to industrial inputs that do not require cropland or food crops as feedstock, avoiding direct competition with food production. Solarferm combines C1 biology with chemistry to make fermentation-grade sugar from carbon.
What is C1 biochemistry?
C1 biochemistry is the study and engineering of how living systems take up and metabolise single-carbon molecules. Where C1 chemistry handles the catalytic side, C1 biochemistry is about the biology: the enzymes and metabolic pathways that let a microbe grow on, or build products from, a one-carbon source such as methanol, methane, CO, CO₂, or formate. It is a fast-moving corner of industrial biotechnology because it connects abundant single-carbon feedstocks to the vast toolkit of microbial production.
Natural and synthetic C1 utilisation
Nature already has C1 specialists. Methylotrophs grow on methanol and methane; acetogens fix carbon monoxide and CO₂. The field's two complementary strategies are to optimise these natural C1-using organisms, and to engineer synthetic C1 assimilation into well-understood industrial hosts that do not natively have it. Researchers increasingly argue these approaches reinforce each other, and that combining what is learned from natural and synthetic C1-users is the fastest route to competitive C1 biomanufacturing.
Why it matters for biomanufacturing
The motivation is direct. Industrial biology today depends heavily on sugars sourced from agriculture, which compete with food and feed and tie production to farmland. C1 bioconversion offers an alternative: feed microbes single-carbon molecules drawn from industrial carbon rather than from crops, and the supply chain decouples from agriculture. It also closes a loop, turning waste carbon into value rather than emissions.
The challenges, honestly
C1 biomanufacturing is not yet a solved problem, and the credible literature is clear about why. Single-carbon substrates can be slow for microbes to assimilate, enzyme kinetics and metabolic balance are hard to optimise, and growth rates often lag sugar-based systems. The economics are the gating factor: a 2025 techno-economic and life-cycle review of C1 biomanufacturing case studies found that most processes remain at laboratory or pilot scale, and mapped the specific cost barriers that have to fall for commercial viability. Progress is being made on all of these, but the honest position is that scale and cost, not scientific feasibility, are the work.
Where Solarferm fits
Solarferm applies engineered biology within a continuous process that converts carbon and energy into fermentation-grade sugar, and licenses the technology so partners can run it on their own sites. The aim is the same one the field is working toward: industrial-quality feedstock made from carbon, at a cost and scale biomanufacturing can build on. Solarferm's public positioning is carbon-to-sugar: it produces fermentation-grade sugar from carbon dioxide, hydrogen, and energy. The single-carbon molecules described above are field-level examples, not a statement of Solarferm's specific inputs.
Frequently asked questions
What is C1 biochemistry?
The microbial metabolism of single-carbon molecules, how microbes take up and convert compounds like methanol, methane, carbon monoxide, and carbon dioxide into products.
Which microbes use C1 compounds?
Natural C1-users include methylotrophs (methanol, methane) and acetogens (carbon monoxide, carbon dioxide); synthetic biology is also engineering C1 use into other industrial strains.
Why use C1 feedstocks instead of sugar?
C1 feedstocks come from industrial carbon rather than crops, so they do not require cropland or food crops as feedstock, avoiding direct competition with food production, and are not exposed to harvests and weather.
What are the main challenges in C1 biomanufacturing?
Mainly slow assimilation, enzyme and pathway efficiency, and cost at scale. The barriers are economic and engineering, not feasibility.
How does Solarferm use C1 biology?
Solarferm combines engineered biology with chemistry in a continuous process to produce fermentation-grade sugar from carbon and energy.
References
- Jiang W, Hernández Villamor D, Peng H, Chen J, Liu L, Haritos VS, Ledesma-Amaro R. Metabolic engineering strategies to enable microbial utilization of C1 feedstocks. Nature Chemical Biology. 2021;17(8):845–855. doi:10.1038/s41589-021-00836-0
- Orsi E, Nikel PI, Nielsen LK, Donati S. Synergistic investigation of natural and synthetic C1-trophic microorganisms to foster a circular carbon economy. Nature Communications. 2023;14. doi:10.1038/s41467-023-42166-w
- Zhang C, Fei Q, Fu R, Lackner M, Zhou YJ, Tan T. Economic and sustainable revolution to facilitate one-carbon biomanufacturing. Nature Communications. 2025;16. doi:10.1038/s41467-025-60247-w
- Puiggené Ò, Favoino G, Federici F, Partipilo M, Orsi E, Alván-Vargas MVG, et al. Seven critical challenges in synthetic one-carbon assimilation and their potential solutions. FEMS Microbiology Reviews. 2025;49:fuaf011. doi:10.1093/femsre/fuaf011