A Simple Recombinant E. coli Cell Lysate-Based Biocatalyst for ATP-Dependent Multi-step Reactions.

Area of Science:

• Biotechnology
• Synthetic Biology
• Enzymology

Background:

• ATP-dependent enzymatic reactions are crucial in biosynthesis but are often limited by high cofactor costs and complex recycling systems.
• Stoichiometric cofactor requirements and the need for additional purified enzymes for cofactor regeneration increase the expense and complexity of cell-free biotransformations.

Purpose of the Study:

• To develop a simplified and cost-effective method for conducting ATP-dependent biotransformations using recombinant cell-free extracts.
• To enable efficient ATP recycling within the cell-free system, thereby reducing cofactor dependency and the need for auxiliary enzymes.

Main Methods:

• Production of recombinant Escherichia coli (E. coli) cell-free extracts overexpressing key enzymes for desired biotransformations.
• Utilizing endogenous kinases present in the E. coli extract to catalyze the in situ recycling of adenosine triphosphate (ATP).
• Applying the developed cell-free system to various in vitro enzymatic cascades involving multiple ATP-dependent steps.

Main Results:

• An inexpensive method for preparing E. coli cell-free extracts capable of supporting ATP-dependent biotransformations was established.
• The endogenous kinases within the extract effectively recycled ATP, allowing the use of only catalytic amounts of the cofactor.
• The system successfully facilitated diverse in vitro enzymatic cascades with multiple ATP-dependent steps, demonstrating its broad applicability.

Conclusions:

• Recombinant cell-free extracts offer a simplified and economical approach for ATP-dependent biotransformations.
• The inherent enzymatic machinery of E. coli extracts can be leveraged for efficient cofactor recycling, significantly reducing costs and operational complexity.
• This method provides a versatile platform for various synthetic biology and biocatalysis applications.