title: Tissue culture and expression of Escherichia coli heat-labile enterotoxin B subunit in transgenic Peperomia pellucida.
abstract: The B subunit of Escherichia coli heat-labile enterotoxin (LTB), a non-toxic molecule with potent biological properties, is a powerful mucosal and parenteral adjuvant that induces a strong immune response against co-administered or coupled antigens. We synthesized a gene encoding the LTB adapted to the optimized coding sequences in plants and fused to the endoplasmic reticulum retention signal SEKDEL to enhance its expression level and protein assembly in plants. The synthetic LTB gene was located into a plant expression vector under the control of CaMV 35S promoter and was introduced into Peperomia pellucida by biolistic transformation method. The integration of synthetic LTB gene into genomic DNA of transgenic plants was confirmed by genomic DNA PCR amplification method. The assembly of plant-produced LTB was detected by western blot analysis. The amount of LTB protein produced in transgenic P. pellucida leaves was approximately 0.75% of the total soluble plant protein. Enzyme-linked immunosorbent assay indicated that plant-synthesized LTB protein bound specifically to GM1-ganglioside, which is receptor for LTB on the cell surface, suggesting that the LTB subunits formed biological active pentamers.
authors.affiliation: Institute of Resources, Environment and Biotechnology, Hue University, Hue, Viet Nam.
authors.forename: Nguyen Hoang
authors.initials: NH
authors.lastname: Loc
authors.forename: Nguyen Hoang
authors.initials: NH
authors.lastname: Bach
authors.forename: Tae-Geum
authors.initials: TG
authors.lastname: Kim
authors.forename: Moon-Sik
authors.initials: MS
authors.lastname: Yang
mesh_terms: D001427:Bacterial Toxins / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D004768:Enterotoxins / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D005677:G(M1) Ganglioside / Q000378:metabolism; D015870:Gene Expression; D005798:Genes, Bacterial; D036941:Peperomia / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics* / Q000378:metabolism; D011485:Protein Binding; D046509:Tissue Culture Techniques; D014170:Transformation, Genetic
chemical_list: D001427:Bacterial Toxins; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D005677:G(M1) Ganglioside; C027538:heat-labile enterotoxin, E coli