title: Bacterial expression, purification and preliminary X-ray crystallographic characterization of the invertase inhibitor Nt-CIF from tobacco.
abstract: Acid invertases catalyzing the breakdown of sucrose are regulated at the post-translational level by extracellular inhibitory proteins of 16-20 kDa molecular weight in a pH-dependent manner. Little is known about the characteristics of the underlying protein-protein interaction. Here, the expression, purification, characterization, crystallization and initial X-ray analysis of a biologically active invertase inhibitor Nt-CIF from tobacco is reported. Four crystal forms covering a wide pH range have been obtained and data sets at resolutions higher than 2.5 A have been collected.
authors.affiliation: European Molecular Biology Laboratory, Structural and Computational Biology Programme, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Hothorn
authors.forename: Fabien
authors.initials: F
authors.lastname: Bonneau
authors.forename: Gunter
authors.initials: G
authors.lastname: Stier
authors.forename: Steffen
authors.initials: S
authors.lastname: Greiner
authors.forename: Klaus
authors.initials: K
authors.lastname: Scheffzek
mesh_terms: D003001:Cloning, Molecular; D018360:Crystallography, X-Ray; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D015870:Gene Expression; D010940:Plant Proteins / Q000096:biosynthesis* / Q000737:chemistry* / Q000235:genetics / Q000494:pharmacology; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000494:pharmacology; D014026:Nicotiana / Q000737:chemistry*; D043324:beta-Fructofuranosidase / Q000037:antagonists & inhibitors
chemical_list: D004791:Enzyme Inhibitors; C110996:INH protein, Nicotiana tabacum; D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D043324:beta-Fructofuranosidase