title: Overexpression, purification and preliminary X-ray diffraction analysis of the controller protein C.Csp231I from Citrobacter sp. RFL231.
abstract: Restriction-modification controller proteins play an essential role in regulating the temporal expression of restriction-modification genes. The controller protein C.Csp231I represents a new class of controller proteins. The gene was sublconed to allow overexpression in Escherichia coli. The protein was purified to homogeneity and crystallized using the hanging-drop vapour-diffusion method. The crystals diffracted to 2.0 A resolution and belonged to space group P2(1). An electrophoretic mobility-shift assay provided evidence of strong binding of C.Csp231I to a sequence located upstream of the csp231IC start codon.
authors.affiliation: Institute of Biomedical and Biomolecular Sciences, School of Biological Sciences, University of Portsmouth, Portsmouth, England.
authors.forename: S D
authors.initials: SD
authors.lastname: Streeter
authors.forename: J E
authors.initials: JE
authors.lastname: McGeehan
authors.forename: G G
authors.initials: GG
authors.lastname: Kneale
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification*; D002954:Citrobacter / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry; D024202:Electrophoretic Mobility Shift Assay; D008969:Molecular Sequence Data; D012399:Rotation; D016415:Sequence Alignment; D014961:X-Ray Diffraction
chemical_list: D001426:Bacterial Proteins; D004247:DNA