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Streamlined production, purification, and characterization of recombinant extracellular polyhydroxybutyrate

Diana I Martínez-Tobón1, Brennan Waters1, Anastasia L Elias1

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada.

Microbiologyopen
|February 23, 2020
PubMed
Summary

This study presents a refined method for producing polyhydroxybutyrate (PHB) depolymerases (PhaZs) in Escherichia coli. Optimized conditions and expression strains improve the yield and purity of these enzymes for PHB degradation research.

Keywords:
Escherichia coli vectorsextracellular PHB depolymerases (PhaZs)poly(3-hydroxybutyrate) (PHB)polymer degradation activityrecombinant expression

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Heterologous production of extracellular polyhydroxybutyrate (PHB) depolymerases (PhaZs) is crucial for research but often faces implementation challenges.
  • Advancements in recombinant protein production tools in Escherichia coli offer opportunities to overcome these limitations.

Purpose of the Study:

  • To develop and validate a method for the efficient heterologous production of various PhaZs in E. coli.
  • To optimize expression and purification conditions for recombinant PhaZs (rPhaZs) from different bacterial sources.
  • To evaluate the PHB degradation activity of produced rPhaZs under varying conditions.

Main Methods:

  • Recombinant His-tagged PhaZs (rPhaZs) from five bacterial strains were produced in E. coli Rosetta-gami B(DE3).
  • Expression and purification conditions, including IPTG concentration and size exclusion chromatography, were optimized.
  • PHB degradation activity was assessed using an adapted plate-based assay across different pH and temperatures.

Main Results:

  • Successful production of rPhaZs from Comamonas testosteroni, Cupriavidus sp. T1, Marinobacter algicola, Pseudomonas stutzeri, and Ralstonia sp. was achieved with variable yields.
  • PhaZs from C. testosteroni and P. stutzeri showed higher amenability to heterologous expression.
  • Optimized methods successfully improved expression and purity for less amenable PhaZs.
  • rPhaZ from M. algicola exhibited peak activity at 15°C, while rPhaZs from Cupriavidus sp. T1 and Ralstonia sp. were most active at pH 5.4.

Conclusions:

  • The proposed method enhances the production of soluble recombinant PhaZs in E. coli.
  • Optimized expression and purification strategies are effective in overcoming challenges with diverse PhaZs.
  • The study provides a framework for preliminary evaluation of PhaZs for PHB degradation applications.