Abstract
F-actin depolymerizing factor (ADF) of human serum was purified 250-400-fold to more than 98% purity with high reproducibility. The purification included (1) 30-50% (NH4)2SO4 precipitation, (2) ion-exchange chromatography on DEAE-Sepharose, (3) chromatofocusing on Polybuffer exchanger 94 and (4) affinity chromatography on ConA-Sepharose. The recovery of ADF was estimated to be 20-30% whereas the ADF activity yield was 5-17%. The lower activity yield was thought to be due-partly to proteolysis and partly to destabilization of highly purified ADF.
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