title: pUBEX/pUBSEX: a versatile expression vector system for production of fusion and nonfusion proteins in Escherichia coli.
abstract: Despite the large number of expression vectors now available, none provide the facility of allowing fusion and nonfusion protein production from the same vector system. In some situations it is preferable to obtain an insoluble fusion protein, in others a soluble nonfusion protein may be required. We have designed, constructed and tested a modification of the pEX vectors, in which it is possible to express the product of a suitably inserted cDNA either as part of a Cro-beta-galactosidase (Cro-beta Gal) fusion or as a delta Cro fusion which contains only nine noninsert-encoded amino acids at its N terminus. The conversion from Cro-beta Gal to delta Cro fusion protein production is achieved by a simple intramolecular deletion of lacZ sequence from the pUBEX vector, to create the pUBSEX variant. Plasmid pUBEX can be induced to produce large amounts of insoluble Cro-beta Gal fusion proteins, whereas pUBSEX will produce predominantly soluble delta Cro fusion proteins.
authors.affiliation: European Molecular Biology Laboratory, Heidelberg, F.R.G.
authors.forename: G
authors.initials: G
authors.lastname: Banting
authors.forename: J P
authors.initials: JP
authors.lastname: Luzio
authors.forename: P
authors.initials: P
authors.lastname: Braghetta
authors.forename: B
authors.initials: B
authors.lastname: Brake
authors.forename: K K
authors.initials: KK
authors.lastname: Stanley
mesh_terms: D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins; D004926:Escherichia coli / Q000235:genetics*; D015870:Gene Expression; D005822:Genetic Vectors / Q000235:genetics*; D007763:Lac Operon; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics*; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis* / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; D001616:beta-Galactosidase / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D012097:Repressor Proteins; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins; D001616:beta-Galactosidase