title: Structure of the ColE1 rop protein at 1.7 A resolution.
abstract: Structural details of the Rop protein from plasmid ColE1 are presented, with a description of the X-ray crystal structure determination and refinement at a nominal resolution of 1.7 A. The 63 amino acid protein is a dimer. Each monomer consists almost entirely of two alpha helices, the whole molecule forming a highly regular four-alpha-helix bundle. This may be approximated by a four-stranded rope with a radius of 7.0 A, a left-handed helical twist and a pitch of 172.5 A. The packing constraints for this novel type of coiled-coil structure are given. The protein acts in the control of plasmid replication via regulation of an RNA-RNA interaction in a manner not yet understood in atomic detail.
authors: EMBL, Heidelberg, FRG.
authors: D W
authors: DW
authors: Banner
authors: M
authors: M
authors: Kokkinidis
authors: D
authors: D
authors: Tsernoglou
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D003086:Bacteriocin Plasmids; D006860:Hydrogen Bonding; D046911:Macromolecular Substances; D008958:Models, Molecular; D010957:Plasmids; D011487:Protein Conformation; D016601:RNA-Binding Proteins; D013696:Temperature
chemical_list: D001426:Bacterial Proteins; D046911:Macromolecular Substances; D016601:RNA-Binding Proteins; C054243:Rop protein, ColE1 plasmid