title: Recombinant HMG1 protein produced in Pichia pastoris: a nonviral gene delivery agent.
abstract: This paper describes the production of a recombinant protein from the expression system based on the methylotrophic yeast Pichia pastoris. Efficient production of rat high-mobility-group 1 (HMG1) protein was obtained using the system. Two forms of HMG1 were secreted into the culture medium: a 24.5-kDa species corresponding to the native HMG1 and a 32-kDa glycosylated derivative. Non-glycosylated recombinant HMG1 was purified easily and shown to possess the same DNA-binding properties as HMG1 purified from calf thymus. Plasmid DNA complexed to the recombinant HMG1 is taken up by a variety of mammalian cells in culture. Transient expression of a luciferase reporter gene was observed. Under selective conditions, stable expression of a neomycin gene was established as a result of integration into the genome. HMG1-mediated gene delivery was as efficient as calcium phosphate-mediated transfection but without associated cell damage. In addition, stable transfectants obtained after selection for G418 resistance usually integrated only one copy of the transfected DNA in contrast to the high unpredictable number obtained by the calcium phosphate method. HMG1 transfection complexes were not toxic to cultured cells, even at high concentrations.
authors.affiliation: Imperial College School of Medicine at St. Mary's, London, England, UK.
authors.forename: A R
authors.initials: AR
authors.lastname: Mistry
authors.forename: L
authors.initials: L
authors.lastname: Falciola
authors.forename: L
authors.initials: L
authors.lastname: Monaco
authors.forename: R
authors.initials: R
authors.lastname: Tagliabue
authors.forename: G
authors.initials: G
authors.lastname: Acerbis
authors.forename: A
authors.initials: A
authors.lastname: Knight
authors.forename: R P
authors.initials: RP
authors.lastname: Harbottle
authors.forename: M
authors.initials: M
authors.lastname: Soria
authors.forename: M E
authors.initials: ME
authors.lastname: Bianchi
authors.forename: C
authors.initials: C
authors.lastname: Coutelle
authors.forename: S L
authors.initials: SL
authors.lastname: Hart
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D015153:Blotting, Western; D018938:Caco-2 Cells; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000235:genetics / Q000302:isolation & purification; D018628:Gene Dosage; D015870:Gene Expression; D018014:Gene Transfer Techniques; D017930:Genes, Reporter; D005822:Genetic Vectors; D006609:High Mobility Group Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D010843:Pichia / Q000235:genetics*; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011485:Protein Binding; D051381:Rats; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D014162:Transfection / Q000379:methods*
chemical_list: D004268:DNA-Binding Proteins; D006609:High Mobility Group Proteins; D011994:Recombinant Proteins; D008156:Luciferases