2.4.1.83 - 2.4.1.83 DEAE-cellulose column chromatography, gel filtration 2.4.1.83 His-tag fusion protein purified using ProBond purification system, more than 97% pure 2.4.1.83 one-step purification 2.4.1.83 partial 2.4.1.83 recombinant His-tagged wild-type and mutant enzymes from Escherichia coli strain C41(DE3) membranes by solubilization with 1% n-dodecyl-beta-D-maltoside in presence of 5% v/v glycerol, nickel affinity chromatography, followed by gel filtration and ultrafiltration. Mutant variant DELTA230-352 is prepared as two fractions, one purified from the membrane fraction (DELTA230-352 m) and one from the aqueous phase (DELTA230-352 s) 2.4.1.83 solubilized with Triton X-100 and purified to homogeneity