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A Relationship between NTP and Cell Extract Concentration for Cell-Free Protein Expression
Katsuki Takahashi1, Gaku Sato1, Nobuhide Doi1
1Department of Biosciences & Informatics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Life (Basel, Switzerland)
|April 3, 2021
Summary
High concentrations of NTP restore cell-free protein synthesis (CFPS) activity lost in high-concentration extracts. This breakthrough advances in vitro emulation of living cells and potential reconstitution of life from biomolecules.
Area of Science:
- Biochemistry
- Synthetic Biology
- Molecular Biology
Background:
- Cell-free protein synthesis (CFPS) is a powerful in vitro tool for mimicking cellular processes.
- High concentrations of cell extracts typically lead to a loss of CFPS activity, hindering in vitro cell emulation.
Purpose of the Study:
- To identify factors that restore CFPS activity in high-concentration cell extracts.
- To overcome limitations in emulating living cell conditions using CFPS.
Main Methods:
- Investigated the effect of high nucleotide triphosphate (NTP) concentrations on CFPS activity with concentrated cell extracts.
- Utilized NTP derivatives and dialysis methods to assess CFPS performance.
- Examined the role of continuous small molecule exchange in improving CFPS efficiency.
Main Results:
- High NTP concentrations restored lost CFPS activity in high-concentration cell extracts, independent of energy regeneration systems.
- NTP derivatives also successfully restored CFPS levels.
- Dialysis CFPS demonstrated that continuous small molecule exchange reduced NTP requirements and increased reaction speed.
Conclusions:
- NTP concentration is a critical factor for maintaining CFPS activity in concentrated cell extracts.
- These findings pave the way for more accurate in vitro emulation of living cell conditions.
- The study supports the future goal of reconstituting living cells from basic biomolecular components.
