title: Purification, crystallization and preliminary X-ray diffraction analysis of a variant of the ColE1 Rop protein.
abstract: Rop is the paradigm of a canonical four-alpha-helical bundle. Its loop region has attracted considerable interest because a single alanine-to-proline substitution (A31P) in the loop is sufficient to change the topology of this small protein. In order to further analyse the loop region as a possible folding-control element, the double mutant D30P/A31G (RopPG) was produced, purified and crystallized. The crystals belonged to space group P2(1), with unit-cell parameters a = 26.7, b = 38.8, c = 56.6 A, beta = 100.9 degrees and two molecules in the asymmetric unit. A complete data set was collected at 100 K to a resolution of 1.4 A using synchrotron radiation.
authors.affiliation: Department of Biology, University of Crete, PO Box 2208, GR-71003 Heraklion, Crete, Greece.
authors.forename: Maria
authors.initials: M
authors.lastname: Ambrazi
authors.forename: George
authors.initials: G
authors.lastname: Fellas
authors.forename: Evangelia G
authors.initials: EG
authors.lastname: Kapetaniou
authors.forename: Dina
authors.initials: D
authors.lastname: Kotsifaki
authors.forename: Mary
authors.initials: M
authors.lastname: Providaki
authors.forename: Michael
authors.initials: M
authors.lastname: Kokkinidis
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification*; D003001:Cloning, Molecular; D003460:Crystallization / Q000379:methods*; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification*; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D001426:Bacterial Proteins; D016601:RNA-Binding Proteins; C054243:Rop protein, ColE1 plasmid