Cell-Free Protein Synthesis Technologies

Cell-free protein synthesis (CFPS) harnesses the molecular machinery of living cells in an open in vitro environment to produce proteins without the constraints of cell viability. Derived from crude lysates or reconstituted systems of purified components, CFPS platforms permit direct control over reaction parameters, modular addition of genetic circuits and precise incorporation of non-canonical amino acids. Recent advances have diversified extract sources to include Escherichia coli, wheat germ, insect cells and human cell lines, each offering distinct advantages in post-translational modification and scalability. Energy regeneration schemes, such as phosphoenolpyruvate or creatine phosphate recycling, sustain prolonged synthesis, while engineered ribosomes and chaperones enhance folding and yield. These technologies underpin rapid prototyping of genetic networks, on-demand biosensing, high-throughput protein engineering and decentralised biomanufacturing of therapeutics. With growing interest in point-of-care diagnostics, accelerated vaccine development and sustainable production of commodity chemicals, CFPS has attained global significance as a flexible, scalable and programmable alternative to cell-based expression systems.

Research from Nature Portfolio

A novel ambient-temperature nucleic acid detection assay employs CFPS to generate reporter proteins from splinted DNA ligation, enabling multiplexed, instrument-free viral diagnostics with lateral-flow readouts. By integrating target-specific ligation and cell-free translation, this approach delivers sensitive detection of multiple respiratory pathogens without thermal control or complex equipment. In parallel, an automated computational platform has expanded the CFPS sensor toolkit by converting protein-binding RNA aptamers into riboswitches. Engineered sensors exhibit up to 16-fold translational regulation in response to human biomarkers, demonstrating low-cost, cell-free assays for point-of-care protein detection and illustrating how in silico design enhances riboswitch accuracy.

Cell-Free Protein Synthesis Technologies publication trend

The graph below shows the total number of articles in cell-free protein synthesis technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Cell-free protein synthesis: In vitro generation of proteins using cellular transcription and translation machinery outside living cells.

Extract: A lysate containing endogenous enzymes, ribosomes and factors necessary for transcription, translation and folding.

PURE system: A fully reconstituted mixture of purified components for defined and minimal cell-free protein synthesis.

Riboswitch: An RNA element that alters gene expression upon binding a specific small molecule or protein ligand.

Energy regeneration system: Biochemical substrates and enzymatic pathways that recycle adenosine triphosphate or guanosine triphosphate to sustain translation.

References

1. Detection of viral RNAs at ambient temperature via reporter proteins produced through the target-splinted ligation of DNA probes. Nature Biomedical Engineering (2023).
2. Automated design of protein-binding riboswitches for sensing human biomarkers in a cell-free expression system. Nature Communications (2023).
3. Precise, Orthogonal Remote-Control of Cell-Free Systems Using Photocaged Nucleic Acids. Journal of the American Chemical Society (2023).
4. A User’s Guide to Cell-Free Protein Synthesis. Methods and Protocols (2019).
5. Microscale to manufacturing scale‐up of cell‐free cytokine production—a new approach for shortening protein production development timelines. Biotechnology and Bioengineering (2011).
6. Cell-free protein synthesis from genomically recoded bacteria enables multisite incorporation of noncanonical amino acids. Nature Communications (2018).