title: Purification of glucosyltransferase from cell-lysate of Streptococcus mutans by counter-current chromatography using aqueous polymer two-phase system.
abstract: Counter-current chromatography (CCC) using a cross-axis coil planet centrifuge (X-axis CPC) was applied to the purification of glucosyltransferase (GTF) from a cell-lysate of cariogenic bacteria. The purification was performed using an aqueous polymer two-phase system composed of 4.4% (w/w) polyethylene glycol (PEG) 8000-6% (w/w) dextran T500 containing 10mM phosphate buffer at pH 9.2 by eluting the upper phase (UP) at 1.0ml/min. The bacterial GTF in the cell-lysate of Streptococcus mutans was selectively retained in the dextran-rich lower stationary phase. The column contents were diluted and subjected to hydroxyapatite (HA) chromatography to remove the polymers from the GTF. Fractions eluted with 500mM potassium phosphate buffer were analyzed by GTF enzymatic activity as well as sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The GTF purity in the final product was increased about 87 times as that in the cell-lysate with a good recovery rate of about 79% through this purification process.
authors.affiliation: Department of Analytical Chemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan. yanagida@ps.toyaku.ac.jp
authors.forename: Akio
authors.initials: A
authors.lastname: Yanagida
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Isozaki
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Shibusawa
authors.forename: Heisaburo
authors.initials: H
authors.lastname: Shindo
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ito
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods; D003377:Countercurrent Distribution / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel; D005964:Glucosyltransferases / Q000302:isolation & purification*; D021241:Spectrometry, Mass, Electrospray Ionization; D013295:Streptococcus mutans / Q000201:enzymology*
chemical_list: D005964:Glucosyltransferases