The 5-enolpyruvylshikimate-3-phosphate synthase of glyphosate-tolerant soybean expressed in Escherichia coli shows no severe allergenicity

Mol Cells. 2003 Feb 28;15(1):20-6.

Abstract

The recombinant gene was amplified from the chromosomal DNA of genetically-modified (GM) soybeans and identified as epsps encoding 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) which renders glyphosate resistance. The epsps structural gene was introduced in the pET28(a) plasmid for its expression in Escherichia coli BL21(DE3). It was confirmed that the maximal productivity of the EPSPS protein was achieved when cultivating the recombinant strain in a LB broth for 2 h after supplementing 1 mM isopropylbeta-D-thiogalactopyranoside (IPTG) in a 2 h-culture broth. Since the expressed EPSPS protein was found as an insoluble form in the inclusion body, it was extracted by 6 M urea after sonication, and then purified through immobilized nickel-affinity column chromatography to isolate EPSPS having a molecular mass of 57 kDa. When incubated in simulated gastric fluid containing pepsin at pH 1.5, the purified EPSPS protein was completely digested within 1 min. In addition, the passive cutaneous anaphylaxis reaction of the purified EPSPS protein was not observed in the Sprague Dawley rat system that was administered either orally or subcutaneously. Furthermore, treatment of the EPSPS protein to the culture of the sensitized peritoneal mast cells, or unsensitized but antisera-labeled mast cells, showed neither a remarkable change in the histamine release nor a cytokine production, including interleukin-4 (IL-4) and tumor necrosis factor-alpha (TNF-alpha). Thus, it can be concluded that the EPSPS protein in the GM soybean showed no significant allergenicity in the Sprague Dawley rats.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3-Phosphoshikimate 1-Carboxyvinyltransferase
  • Administration, Oral
  • Alkyl and Aryl Transferases / adverse effects*
  • Alkyl and Aryl Transferases / antagonists & inhibitors
  • Alkyl and Aryl Transferases / genetics
  • Alkyl and Aryl Transferases / immunology
  • Allergens / adverse effects*
  • Allergens / genetics
  • Allergens / immunology
  • Animals
  • Dietary Proteins / adverse effects*
  • Dietary Proteins / immunology
  • Drug Resistance
  • Enzyme Inhibitors / pharmacology
  • Escherichia coli
  • Food Hypersensitivity / etiology*
  • Food Hypersensitivity / prevention & control
  • Food, Genetically Modified / adverse effects*
  • Gastric Juice / metabolism
  • Glycine / analogs & derivatives*
  • Glycine / pharmacology
  • Herbicides / pharmacology
  • Histamine Release / drug effects
  • Injections, Subcutaneous
  • Interleukin-4 / metabolism
  • Male
  • Mast Cells / drug effects
  • Mast Cells / metabolism
  • Passive Cutaneous Anaphylaxis
  • Peritoneal Cavity / cytology
  • Plant Proteins / adverse effects*
  • Plant Proteins / antagonists & inhibitors
  • Plant Proteins / genetics
  • Plant Proteins / immunology
  • Plasmids / genetics
  • Rats
  • Rats, Sprague-Dawley
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / immunology
  • Soybeans / drug effects
  • Soybeans / enzymology*
  • Soybeans / genetics
  • Soybeans / immunology
  • Specific Pathogen-Free Organisms
  • Tumor Necrosis Factor-alpha / metabolism

Substances

  • Allergens
  • Dietary Proteins
  • Enzyme Inhibitors
  • Herbicides
  • Plant Proteins
  • Recombinant Fusion Proteins
  • Tumor Necrosis Factor-alpha
  • Interleukin-4
  • glyphosate
  • Alkyl and Aryl Transferases
  • 3-Phosphoshikimate 1-Carboxyvinyltransferase
  • Glycine