title: Charged liposome affects the translation and folding steps of in vitro expression of green fluorescent protein.
abstract: The role of the charged liposome on the in vitro expression of green fluorescent protein (GFP) was investigated, focusing on its elemental steps such as transcription, translation and folding. The total GFP expression was enhanced to 145% when a neutral liposome (POPC: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocoline) was added externally to a cell-free translation system. On the contrary, the addition of the charged liposome composed of POPC with anionic 1-palmitoyl-2-oleoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (POPG) or cationic stearyl amine (SA) inhibited the total GFP expression, depending on the surface charge density of liposome. In transcription, the RNA synthesis was enhanced regardless of the variation of the surface charge, indicating that transcription was enhanced due to the stabilization of RNA structure by its hydrophobic interaction with liposome. Translation was inhibited by cationic liposome although it was enhanced by anionic liposome and neutral liposome. On the other hand, the folding was not inhibited in the presence of neutral liposome, whereas anionic liposome and cationic liposome inhibited the folding in proportion to the their surface charges, suggesting that the total GFP expression was controlled by a charged liposome in the translation step and folding step.
authors.affiliation: Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Umakoshi
authors.forename: Keishi
authors.initials: K
authors.lastname: Suga
authors.forename: Huong Thi
authors.initials: HT
authors.lastname: Bui
authors.forename: Masato
authors.initials: M
authors.lastname: Nishida
authors.forename: Toshinori
authors.initials: T
authors.lastname: Shimanouchi
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Kuboi
mesh_terms: D002474:Cell-Free System / Q000737:chemistry* / Q000528:radiation effects; D004926:Escherichia coli / Q000737:chemistry*; D015870:Gene Expression; D049452:Green Fluorescent Proteins / Q000032:analysis / Q000138:chemical synthesis*; D008081:Liposomes / Q000737:chemistry*; D014176:Protein Biosynthesis; D017510:Protein Folding / Q000528:radiation effects; D055672:Static Electricity
chemical_list: D008081:Liposomes; D049452:Green Fluorescent Proteins