Cell-Free FAQ
Find answers to frequently asked questions about cell-free protein expression (CFPS), how cell-free systems work, their advantages, applications and use for protein production.
What is cell-free protein expression (CFPS)?
Cell-free protein synthesis (CFPS), also known as cell-free protein expression, is a protein production method performed outside living cells. It uses cellular extracts containing the natural transcription and translation machinery (enzymes, tRNAs, ribosomes, etc.), supplemented with an energy source, nucleoside triphosphates (NTPs), amino acids, and other additives. Starting from DNA or RNA, the protein of interest is produced directly in vitro. This approach reproduces gene expression without the need for a living cellular unit.
How does a cell-free protein expression system work?
A genetic template (DNA or RNA) is added to an active cell lysate containing the components required for transcription and translation. When starting from DNA (plasmid or linear), messenger RNA is first synthesized, then ribosomes assemble the polypeptide chain. The reaction takes place in an open and controlled environment. Biochemical conditions can be adjusted during synthesis.
What are the advantages of cell-free systems compared to cell-based systems?
Cell-free systems provide rapid results without the need for cell line construction or prolonged culture. The open system allows direct adjustment of the synthesis and folding environment, as well as the addition of cofactors, ligands, or other additives. It also reduces expression failures linked to cytotoxicity, instability, or aggregation. Cell-free expression is particularly well suited for early-stage characterization and experimental validation.
What types of recombinant proteins can be expressed using cell-free systems?
Any type of protein can be expressed using cell-free systems, including membrane proteins through the addition of stabilizers (lipids or detergents), multi-subunit protein complexes through co-translation of several polypeptides, and toxic proteins.
When should cell-free protein synthesis (CFPS) be chosen?
CFPS is particularly relevant when a protein is difficult to express or when rapid results are required. It is used for target validation, interaction studies, labeling, prototyping, and variant screening. It enables the rapid production of a testable protein before considering larger-scale production either in cell-free or cell-based systems.
We look
forward to
your questions
Even
a protein
needs
to express
its potential.
Cell-Free Systems Applications
