title: Cloning, expression, purification, crystallization and preliminary X-ray crystallographic analysis of bacterioferritin A from Mycobacterium tuberculosis.
abstract: Bacterioferritins (Bfrs) comprise a subfamily of the ferritin superfamily of proteins that play an important role in bacterial iron storage and homeostasis. Bacterioferritins differ from ferritins in that they have additional noncovalently bound haem groups. To assess the physiological role of this subfamily of ferritins, a greater understanding of the structural details of bacterioferritins from various sources is required. The gene encoding bacterioferritin A (BfrA) from Mycobacterium tuberculosis was cloned and expressed in Escherichia coli. The recombinant protein product was purified by affinity chromatography on a Strep-Tactin column and crystallized with sodium chloride as a precipitant at pH 8.0 using the vapour-diffusion technique. The crystals diffracted to 2.1 A resolution and belonged to space group P4(2), with unit-cell parameters a = 123.0, b = 123.0, c = 174.6 A.
authors.affiliation: Department of Biochemistry, University of Delhi South Campus, Benito Juarez Road, New Delhi 110021, India.
authors.forename: Vibha
authors.initials: V
authors.lastname: Gupta
authors.forename: Rakesh K
authors.initials: RK
authors.lastname: Gupta
authors.forename: Garima
authors.initials: G
authors.lastname: Khare
authors.forename: Dinakar M
authors.initials: DM
authors.lastname: Salunke
authors.forename: Anil K
authors.initials: AK
authors.lastname: Tyagi
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D003460:Crystallization / Q000379:methods*; D018360:Crystallography, X-Ray / Q000379:methods*; D003573:Cytochrome b Group / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005293:Ferritins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D009169:Mycobacterium tuberculosis / Q000737:chemistry* / Q000254:growth & development; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D003573:Cytochrome b Group; D011994:Recombinant Proteins; D005293:Ferritins; C018032:bacterioferritin