title: Crystallization and preliminary crystallographic studies of the cofactor-binding domain of the LysR-type transcriptional regulator Cbl from Escherichia coli.
abstract: Cbl (CysB-like protein) is a member of the family of LysR-type transcriptional regulators (LTTRs) and controls genes engaged in sulfur assimilation in Escherichia coli. It has been postulated that adenosine 5-phosphosulfate (APS) is responsible for abolishing Cbl-activated transcription from the ssu promoter (Bykowski et al., 2002). To elucidate the structural basis of Cbl function and to confirm the role of APS as an anti-inducer, the cofactor-binding domain of Cbl (c-Cbl, MW = 26 kDa) was cloned, purified and crystallized in the presence of APS. The crystals belong to space group C222(1), but show substantial variation of the unit-cell parameters and diffraction anisotropy. Despite this, X-ray data extending to 3.0 A resolution have been collected and solution of the structure by molecular replacement is in progress.
authors.affiliation: Faculty of Biotechnology and Food Sciences, Technical University of Lodz, Stefanowskiego 4/10, 90-924 Lodz, Poland.
authors.forename: Emilia
authors.initials: E
authors.lastname: Stec
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Witkowska
authors.forename: Monika M
authors.initials: MM
authors.lastname: Hryniewicz
authors.forename: Andrzej M
authors.initials: AM
authors.lastname: Brzozowski
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Wilkinson
authors.forename: Grzegorz D
authors.initials: GD
authors.lastname: Bujacz
mesh_terms: D000250:Adenosine Phosphosulfate / Q000494:pharmacology; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000737:chemistry*; D029968:Escherichia coli Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D011485:Protein Binding / Q000187:drug effects; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D017356:Synchrotrons; D014157:Transcription Factors / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D001426:Bacterial Proteins; C097229:Cbl protein, E coli; D029968:Escherichia coli Proteins; D014157:Transcription Factors; D000250:Adenosine Phosphosulfate; C073470:LysR protein, Bacteria