VERBESSERTES VERFAHREN ZUR REINIGUNG REKOMBINANTER KUPFER/ZINK (CU-ZN) SUPEROXIDDISMUTASE AUS BAKTERIEN ODER EUKARYOTISCHEN ZELLEN

Disclosed is a method of increasing the yield of recovered solutions having an increased concentration of b isoform of an enzymatically-active polypeptide analog of Cu-Zn superoxide dismutase from a composition which comprises cells containing a, b and c isoforms of the polypeptide analog comprising treating the composition to separate soluble proteins from whole cells, cellular debris and insoluble proteins to obtain a solution containing such soluble proteins, including the a, b and c isoforms; treating the resulting solution with soluble proteins to produce three separate solutions, each of which has an increased concentration of one of either of the a, b or c isoform; recovering the separate solution with an increased concentration of the b isoform; combining the separate solution with an increased concentration of the a isoform with the separate solution with an increased concentration of the c isoform; treating the resulting combined solution to produce a solution with an increased concentration of the b isoform and recovering the then-resulting solution with an increased concentration of the b isoform.