title: Chromatographic purification and characterization of B-phycoerythrin from Porphyridium cruentum. Semipreparative high-performance liquid chromatographic separation and characterization of its subunits.
abstract: A fast preparative two-step chromatographic method for purification of B-phycoerythrin from Porphyridium cruentum is described. This biliprotein was homogeneous as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis yielding three closely migrating bands corresponding to its three subunits. Baseline separation of its alpha-, beta- and gamma-subunits was achieved by a reversed-phase HPLC gradient semipreparative method with a C4 large-pore column and a solvent system consisting of 0.05% trifluoroacetic acid (TFA) in water and 0.05% TFA in acetonitrile. B-Phycoerythrin in different aggregation states and its subunits have been spectroscopically characterized. Hexameric B-phycoerythrin has similar secondary and tertiary structure than dissociated B-phycoerythrin determined by circular dichroism.
authors.affiliation: Department of Physical and Analytical Chemistry, Jaen University, E.U.P. of Linares, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Bermejo
authors.forename: E M
authors.initials: EM
authors.lastname: Talavera
authors.forename: J M
authors.initials: JM
authors.lastname: Alvarez-Pez
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel; D010799:Phycoerythrin / Q000737:chemistry / Q000302:isolation & purification*; D000461:Rhodophyta / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D010799:Phycoerythrin