title: Preparation of highly purified C-phycoerythrin from marine cyanobacterium Pseudanabaena sp.
abstract: C-phycoerythrin was isolated and purified from marine Pseudanabaena sp. using two step chromatographic methods. Phycobiliproteins in the marine Pseudanabaena was extracted in 100 mM phosphate buffer (pH 7.2) and precipitated by salting out. The precipitated C-phycoerythrin was purified by gel filtration with Sephadex G-150, and then it was purified by ion exchange chromatography on DEAE cellulose, which was developed by linear ionic strength gradients. Purified phycoerythrin showed absorption maxima at 568 and 541 nm, and displayed a fluorescence maximum at 578 nm. The absorbance ratio A₅₆₈/A₂₈₀, a criterion for purity (purity ratio) achieved was 6.86. It showed a single band on examination by polyacrylamide gel electrophoresis (PAGE). The polypeptide analysis of the purified C-phycoerythrin by SDS-PAGE demonstrated that it contained two chromophore-carrying subunits. The yield of purified C-phycoerythrin obtained was 13.6 mg/g of the cell dry weight with 47% of yield. Obtaining highly pure C-phycoerythrin allows one to evaluate its fluorescence properties for future applications in biochemical and biomedical research.
authors: Discipline of Marine Biotechnology and Ecology, Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G.B. Marg, Bhavnagar, Gujarat 364021, India. smishra@csmcri.org
authors: Sanjiv K
authors: SK
authors: Mishra
authors: Anupama
authors: A
authors: Shrivastav
authors: Sandhya
authors: S
authors: Mishra
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification*; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D000458:Cyanobacteria / Q000737:chemistry*; D003911:Dextrans / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D005453:Fluorescence; D005612:Freeze Drying; D008970:Molecular Weight; D010799:Phycoerythrin / Q000737:chemistry / Q000302:isolation & purification*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001426:Bacterial Proteins; D003911:Dextrans; D010799:Phycoerythrin; C025614:sephadex