Purity: > 90 % by SDS - PAGE Format: Liquid. In 20mM Tris-HCl buffer(pH 8.5) containing 50% glycerol, 1mM DTT, 0.15M NaCl. PSMB5 is a member of the proteasome B-type family that is a 20S core beta subunit in the proteasome. This catalytic subunit is not present in the immunoproteasome and is replaced by catalytic subunit 3i (proteasome beta 8 subunit). PSMB5 has an ATP dependent proteolytic activity and involved in an ATP/ubiquitin dependent non lysosomal proteolytic pathway. Recombinant human PSMB5 protein, fused to His-tag at N-terminus, was expressed in E.coli and purified by using conventional chromatography techniques.