SDS-polyacrylamide gel of 58-HCS purification fractions. A, lane 1, low range molecular weight markers (Bio-Rad). Lane 2, crude extract after induction. Lane 3, sample obtained from the first Ni2+-Sepharose column. Lane 4, sample after SUMO protease 1 cleavage. Lane 5, flow-through from the second Ni2+-Sepharose column. Lane 6, material obtained after Toyopearl anion exchange column. B, 12% SDS-polyacrylamide gel of the pure proteins. Lane 1, low range molecular weight markers. Lane 2, FL-HCS; lane 3, 58-HCS.