title: Expression, crystallization and preliminary X-ray analysis of a ferric binding protein from Thermus thermophilus HB8.
abstract: A ferric binding protein from Thermus thermophilus HB8 (TtFbpA) was expressed, purified and crystallized using the hanging-drop vapour-diffusion method. Four different crystal forms were obtained and characterized by X-ray diffraction. Two crystal forms with TtFbpA in the apo state belonged to the orthorhombic space group P2(1)2(1)2(1) (unit-cell parameters a = 42.1, b = 139.3, c = 326.5 Å and a = 42.1, b = 139.3, c = 218.9 Å). The third form with TtFbpA also in the apo state belonged to the monoclinic space group P2(1) (unit-cell parameters a = 66.5, b = 61.7, c = 73.9 Å, β = 111.7°). The fourth form, with TtFbpA in the iron-bound holo state as confirmed by an atomic absorption spectrophotometry assay, belonged to the trigonal space group P3(1)21 or P3(2)21 (unit-cell parameters a = 63.6, b = 63.6, c = 266.7 Å, α = β = 90.0, γ = 120.0°).
authors.affiliation: College of Life Sciences, Capital Normal University, Beijing, People's Republic of China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Liying
authors.initials: L
authors.lastname: Chang
authors.forename: Xinquan
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Liu
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics; D027682:Cation Transport Proteins / Q000737:chemistry* / Q000235:genetics; D003460:Crystallization; D018360:Crystallography, X-Ray; D015870:Gene Expression; D016963:Thermus thermophilus / Q000737:chemistry*
chemical_list: D001426:Bacterial Proteins; D027682:Cation Transport Proteins