title: Jel44 monoclonal Fab fragment specific for HPr of the phosphoenolpyruvate:sugar phosphotransferase system of Escherichia coli and the complex of Jel44 Fab fragment with HPr: preparation, crystallization and preliminary crystallographic analysis.
abstract: Jel44 is a mouse monoclonal antibody specific for the histidine-containing phosphocarrier protein (HPr), a component of a sugar-transport system in Escherichia coli. Because Jel44 binding to HPr is dependent upon ionic strength and the enthalpic and entropic contributions do not vary over the temperature range 277-310 K, the complex is of great interest. A single crystal of the Jel44 Fab fragment was obtained and diffracted X-rays to a maximum resolution of 4.6 A on an in-house X-ray source. The crystal belongs to space group P2(1), with unit-cell parameters a = 68.6, b = 67.7, c = 105.5 A, beta = 96 degrees. Although crystals of the complex of Jel44 Fab fragment with HPr could not be fully characterized owing to suspected crystal twinning, it was encouraging that they diffracted X-rays to 2.5 A on an in-house X-ray source. It is thus foreseen that improvement of crystal quality will allow the complete solution of this novel structure.
authors.affiliation: Department of Biochemistry, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan, S7N 5E5, Canada.
authors.forename: Janneta
authors.initials: J
authors.lastname: Gulyaeva-Tcherkassova
authors.forename: Shaunivan L
authors.initials: SL
authors.lastname: Labiuk
authors.forename: Jeremy S
authors.initials: JS
authors.lastname: Lee
authors.forename: E Bruce
authors.initials: EB
authors.lastname: Waygood
authors.forename: Louis T J
authors.initials: LT
authors.lastname: Delbaere
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry* / Q000276:immunology; D000918:Antibody Specificity; D001426:Bacterial Proteins; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology*; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry* / Q000276:immunology; D051379:Mice; D010446:Peptide Fragments / Q000737:chemistry* / Q000276:immunology; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000737:chemistry* / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D007140:Immunoglobulin Fab Fragments; D010446:Peptide Fragments; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; C030182:phosphocarrier protein HPr