title: Zbasic: a purification tag for selective ion-exchange recovery.
abstract: A positively charged protein domain, denoted Zbasic, can be used as a general purification tag for purification of recombinantly produced target proteins by cation-exchange chromatography. The Zbasic domain is constructed from the Protein A-derived domain and engineered to be highly charged, which allows selective capture on a cation exchanger at physiological pH values. Moreover, Zbasic is selective also under denaturing conditions and can be used for purification of proteins solubilized from inclusion bodies. Zbasic can then be used as a flexible linker to the cation-exchange resin and thereby allow solid-phase refolding of the target protein.Herein, protocols for purification of soluble Zbasic-tagged fusion proteins, as well as for integrated purification and solid-phase refolding of insoluble fusion proteins, are described. In addition, a procedure for enzymatic tag removal and recovery of native target protein is outlined.
authors.affiliation: Department of Anatomy, Physiology and Biochemistry, Uppsala Biomedical Centre, Swedish University of Agricultural Sciences, Uppsala, Sweden.
authors.forename: My
authors.initials: M
authors.lastname: Hedhammar
authors.forename: Johan
authors.initials: J
authors.lastname: Nilvebrant
authors.forename: Sophia
authors.initials: S
authors.lastname: Hober
mesh_terms: D002411:Cation Exchange Resins; D002852:Chromatography, Ion Exchange / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration
chemical_list: D002411:Cation Exchange Resins