A Bifunctional Polyphosphate Kinase Driving the Regeneration of Nucleoside Triphosphate and Reconstituted Cell-Free Protein Synthesis

Po Hsiang Wang, Kosuke Fujishima, Samuel Berhanu, Yutetsu Kuruma, Tony Z. Jia, Anna N. Khusnutdinova, Alexander F. Yakunin, Shawn E. McGlynn

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Reconstituted cell-free protein synthesis systems (e.g., the PURE system) allow the expression of toxic proteins, hetero-oligomeric protein subunits, and proteins with noncanonical amino acids with high levels of homogeneity. In these systems, an artificial ATP/GTP regeneration system is required to drive protein synthesis, which is accomplished using three kinases and phosphocreatine. Here, we demonstrate the replacement of these three kinases with one bifunctional Cytophaga hutchinsonii polyphosphate kinase that phosphorylates nucleosides in an exchange reaction from polyphosphate. The optimized single-kinase system produced a final sfGFP concentration (â 530 μg/mL) beyond that of the three-kinase system (â 400 μg/mL), with a 5-fold faster mRNA translation rate in the first 90 min. The single-kinase system is also compatible with the expression of heat-sensitive firefly luciferase at 37 °C. Potentially, the single-kinase nucleoside triphosphate regeneration approach developed herein could expand future applications of cell-free protein synthesis systems and could be used to drive other biochemical processes in synthetic biology which require both ATP and GTP.

Original languageEnglish
Pages (from-to)36-42
Number of pages7
JournalACS Synthetic Biology
Volume9
Issue number1
DOIs
StatePublished - 17 Jan 2020

Keywords

  • NTP regeneration
  • family II polyphosphate kinase
  • functional protein expression
  • reconstituted cell-free protein synthesis

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