Cell-free Protein Synthesis Kits



Size Price (USD)
250 µL $166.00


Size Price (USD)
2 mL $840.00


Size Price (USD)
5x 2 mL $3990.00

Ordering through the online e-commerce system is available only to customers in the USA and Canada.

International sales of GeneFrontier's products are carried out by Cosmo Bio USA.
To request a quote or place an order, please contact Cosmo Bio USA.

We inform that preparation method of the ribosomes contained in PUREfrex® 1.0 kits will be changed from October 2023.
Please click here for details.
[Important] Notice of Material and Preparation Method Change



PUREfrex® kit is a reconstituted in vitro Coupled Transcription/Translation Systems, completely different from an E.coli extract S30 system.

PUREfrex® is a series of newly developed reconstituted cell-free protein synthesis reagent based on PURE (Protein synthesis Using Recombinant Elements) system technology invented by Professor Takuya Ueda in the University of Tokyo.

PUREfrex®1.0 is the kit for basic research.
The productivity is lower and than PUREfrex®2.0.

Disclosure of Component Information

The component information of PUREfrex®1.0 is disclosed.
You may designed customize kits based on PUREfrex®1.0.

Custom Kits

Custom kits are made to order upon request.
Before considering a custom kit, it is recommended that you verify that the protein of interest can be synthesized with PUREfrex®1.0.
Please visit the web site for more information.

Lower Contamination

By improving the purification process of components of PUREfrex®, contamination of RNase and β-galactosidase are greatly reduced, in addition to that, lipopolysaccharide (LPS) is also reduced to around 0.1 EU per 1 µL of reaction mixture. All proteinous components of PUREfrex® have no tags for purification and detection. It allows to fuse your protein with any tag to purify the product.

Experiment Workflow

General procedures for using PUREfrex® to synthesize functional proteins are shown in Figure.

Start by preparing the template DNA suitable to the protein synthesis with PUREfrex® and examine whether the protein of interest is synthesized. Redesign the nucleotide sequence of the template DNA if too little protein is synthesized. Add supplement such as molecular chaperones or changing the synthesis conditions if the solubility or activity of the synthesized protein is low or absent. The kit contains enough reagents for examining whether the target protein can be synthesized.


The amounts given are for 20 µL reaction. For scaling up the reaction, adjust the volume of reagents accordingly.

1. Thaw Solution I by incubation at room temperature or 37 °C for 1 minute for completely dissolving, and then cool on ice.

2. Thaw Solution II and III on ice.

3. Mix Solution I, II and III respectively by vortex and centrifuge briefly to collect each solution at the bottom.

4. Assemble the reaction mixture in a tube as follows. Add the template DNA to 1 – 3 ng/µL per 1 kb.

Water 8-X μL
Solution I 10 µL
Solution II 1 μL
Solution III 1 μL
Template DNA *1 X μL
Total 20 μL

5. Incubate the tube at 37 °C for 2 – 4 hours on a heat block or a water bath.

6. Analyze the synthesized products. Please add the same amount of H2O to the reaction for the sample of SDS-PAGE.

  1. Please visit the template DNA preparation site.

Video - How to use PUREfrex -


Kit components   <PUREfrex® 1.0>

Reagent Quantity
for 250 μL rxn
for 2 mL x 5 rxn
Description Storage *1
Solution Ⅰ 125 μL 1000 μL x 5 Amino acids, NTPs, tRNAs and substrates for enzymes etc. -20 °C
Solution Ⅱ 12.5 μL 100 μL x 5 Proteins in 30 % glycerol buffer -20 °C or -80 °C*2
Solution Ⅲ 12.5 μL 100 μL x 5 Ribosome (20 μM) -80 °C*2
DHFR DNA *3 10 μL 10 μL x 1 PCR product containing a gene encoding dihydrofolate reductase (DHFR) from E.coli as a positive control. (20 ng/μL) -20 °C
  1. Indicated temperature shows storage temperature after opening the kit. Please store the kit at -80 °C before opening.
  2. The rest of solution should be frozen rapidly in liquid nitrogen or dry ice/ethanol, and be stored at -80 °C. Divide into aliquots, if necessary, and avoid refreeze and thaw as much as possible.
  3. For synthesizing DHFR, add 1 µL of DHFR DNA to 20 µL of reaction. Sequence of DHFR DNA is here.










PUREfrex® is developed for in vitro research only. PUREfrex® should not be used for the therapy, diagnostic or administration to animals including human and should not be used as food or cosmetics etc. To avoid the contamination of nuclease, nuclease-free-treated water, reagents and materials should be used. We also recommend wearing gloves and mask.

“PUREfrex® is Registered in U.S. Patent and Trademark Office”


On the Resources page, you can find posters and technical notes about PUREfrex®.
Additionally, there are papers that use PUREfrex® or PURE system technology.

Related Products

When your protein needs an assistance of molecular chaperone or a formation of a disulfide bond to form a correct conformation, we have supplemental reagents by simply adding to PUREfrex®1.0.

Cell-free Protein Synthesis Kits


for Syntesis Proteins

Catalog No.

  • PF201-0.25-EX, PF201-2ML-EX, PF201-10ML-EX


for Forming Disulfide Bonds

Catalog No.

  • PF213-0.25-EX, PF213-2ML-EX, PF213-10ML-EX

Supplements – Chaperones –

These are supplement for PUREfrex® which is molecular chaperone to be aggregate-prone protein in a soluble form.

DnaK Mix


Catalog No.

  • PF003-0.5-EX, PF003-10ML-EX

GroE Mix


Catalog No.

  • PF004-0.5-EX, PF004-10ML-EX

Supplements – Forming disulfide bonds –

This is supplement for synthesizing proteins containing disulfide bonds in an active form.

DsbC Set

E.coli disulfide bond isomerase, GSSG

Catalog No.

  • PF005-0.5-EX, PF005-10ML-EX


Human disulfide bond isomerase, Ero1, GSSG

Catalog No.

  • PF006-0.5-EX, PF006-10ML-EX