title: The E2 protein of human papillomavirus type 16. Over-expression and purification of an active transcriptional regulator.
abstract: The E2 open reading frame of human papillomavirus type 16 was inserted into the Escherichia coli vector pKK223-3, and expressed to greater than 15% of total cellular protein when induced with isopropyl beta-D-thiogalactopyranoside. The highest expressing clone was grown in bulk and the E2 protein purified to homogeneity by the following procedure: (a) isolation of the insoluble protein fraction; (b) extraction with urea; (c) quaternary amino-ethyl-Sepharose ion-exchange chromatography and (d) renaturation and chromatography on dextran sulphate. That the purified protein was fully functionally active was confirmed by its specific DNA-binding properties and its ability to activate gene transcription by over two orders of magnitude in an in vivo assay.
authors.affiliation: Laboratory of Molecular Virology, Imperial Cancer Research Fund, London, England.
authors.forename: E M
authors.initials: EM
authors.lastname: Lees
authors.forename: H P
authors.initials: HP
authors.lastname: Driessen
authors.forename: L V
authors.initials: LV
authors.lastname: Crawford
authors.forename: A R
authors.initials: AR
authors.lastname: Clarke
mesh_terms: D001483:Base Sequence; D015153:Blotting, Western; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000096:biosynthesis*; D004926:Escherichia coli / Q000378:metabolism; D015967:Gene Expression Regulation, Viral; D005809:Genes, Regulator; D005814:Genes, Viral; D006801:Humans; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000096:biosynthesis*; D027383:Papillomaviridae / Q000235:genetics* / Q000378:metabolism; D010957:Plasmids; D011994:Recombinant Proteins / Q000096:biosynthesis*; D015534:Trans-Activators / Q000096:biosynthesis; D014157:Transcription Factors / Q000096:biosynthesis*
chemical_list: D004268:DNA-Binding Proteins; C054855:E2 protein, Human papillomavirus type 16; D009856:Oncogene Proteins, Viral; D011994:Recombinant Proteins; D015534:Trans-Activators; D014157:Transcription Factors