title: A recombinant human immunodeficiency virus type-1 capsid protein (rp24): its expression, purification and physico-chemical characterization.
abstract: An expression system has been established in Escherichia coli to facilitate the preparation of the HIV-1 capsid protein in amounts sufficient for structural analysis. A plasmid vector pTCA5, containing the gene for the recombinant HIV-1 capsid protein rp24 under the control of the lambda-PR-promoter, was constructed which gave an expression product that spanned 234 amino acid residues. It differs at the N-terminus from the authentic sequence in that the residues Pro-Ile- are replaced by Met-Asn-Ser-Ala-Met-. Recombinant p24 was produced, as inclusion bodies in E. coli LE392 containing pTCA5, at a level of approximately 15% of the total cellular protein. After dissolution of the inclusion bodies in the acidic urea system, the protein was easily reconstituted in a soluble state by dialysis. The yield of reconstituted and purified protein was 12 mg per liter in rich medium. Recombinant rp24 consists of about 40% alpha-helix and 10% beta-sheet from circular dichroism measurements and the two cysteine residues, within the rp24 sequence, are bridged by a disulfide bond.
authors.affiliation: Institut für Biochemie der Charité Humboldt-Universität, Medizinische Fakultät (Charité), Med. Universit atsklinik III, Berlin, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Hausdorf
authors.forename: A
authors.initials: A
authors.lastname: Gewiess
authors.forename: V
authors.initials: V
authors.lastname: Wray
authors.forename: T
authors.initials: T
authors.lastname: Porstmann
mesh_terms: D001483:Base Sequence; D017931:DNA Primers; D004926:Escherichia coli / Q000235:genetics; D016655:HIV Core Protein p24 / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D010957:Plasmids; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics
chemical_list: D017931:DNA Primers; D016655:HIV Core Protein p24; D011994:Recombinant Proteins