title: The structure of ColE1 rop in solution.
abstract: The structure of the ColE1 repressor of primer (rop) protein in solution was determined from the proton nuclear magnetic resonance data by a combined use of distance geometry and restrained molecular dynamics calculations. A set of structures was determined with low internal energy and virtually no violations of the experimental distance restraints. Rop forms homodimers: Two helical hairpins are arranged as an antiparallel four helix bundle with a left-handed rope-like twist of the helix axes and with left-handed bundle topology. The very compact packing of the side chains in the helix interfaces of the rop coiled-coil structure may well account for its high stability. Overall, the solution structure is highly similar to the recently determined X-ray structure (Banner, D.W., Kokkinidis, M. and Tsernoglou, D. (1987) J. Mol. Biol., 196, 657-675), although there are minor differences in regions where packing forces appear to influence the crystal structure.
authors.affiliation: European Molecular Biology Laboratory, Heidelberg, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Eberle
authors.forename: A
authors.initials: A
authors.lastname: Pastore
authors.forename: C
authors.initials: C
authors.lastname: Sander
authors.forename: P
authors.initials: P
authors.lastname: Rösch
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D003086:Bacteriocin Plasmids; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D011487:Protein Conformation; D016601:RNA-Binding Proteins; D012996:Solutions
chemical_list: D001426:Bacterial Proteins; D016601:RNA-Binding Proteins; C054243:Rop protein, ColE1 plasmid; D012996:Solutions