title: Production of polyhydroxybutyrate by polycistronic expression of bacterial genes in tobacco plastid.
abstract: Transgenic techniques are used to enhance and improve crop production, and their application to the production of chemical resources in plants has been under investigation. To achieve this latter goal, multiple-gene transformation is required to improve or change plant metabolic pathways; when accomplished by plant nuclear transformation, however, this procedure is costly and time consuming. We succeeded in the metabolic engineering of the tobacco plant by introducing multiple genes within a bacteria-like operon into a plastid genome. A tobacco plastid was transformed with a polycistron consisting of the spectinomycin resistance gene and three bacterial genes for the biosynthesis of the biodegradable polyester, poly[(R)-3-hydroxybutyrate] (PHB), after modification of their ribosome binding sites. DNA and RNA analysis confirmed the insertion of the introduced genes into the plastid genome and their polycistronic expression. As the result, the transplastomic tobacco accumulated PHB in its leaves. The introduced genes and the PHB productivity were maternally inherited, avoiding genetic spread by pollen diffusion, and were maintained stably in the seed progeny. Despite the low PHB productivity, this report demonstrates the feasibility of transplastomic technology for metabolic engineering. This "phyto-fermentation" system can be applied to plant production of various chemical commodities and pharmaceuticals.
authors.affiliation: Microbial Toxicology Laboratory, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Arai
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Shikanai
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Doi
authors.forename: Shigeo
authors.initials: S
authors.lastname: Yoshida
authors.forename: Isamu
authors.initials: I
authors.lastname: Yamaguchi
authors.forename: Hideo
authors.initials: H
authors.lastname: Nakashita
mesh_terms: D001483:Base Sequence; D001704:Biopolymers / Q000378:metabolism*; D017931:DNA Primers; D005798:Genes, Bacterial; D005818:Genetic Engineering; D006885:Hydroxybutyrates / Q000378:metabolism*; D018087:Plastids / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014026:Nicotiana / Q000235:genetics*
chemical_list: D001704:Biopolymers; D017931:DNA Primers; D006885:Hydroxybutyrates