Protein tyrosine phosphatase DEP1 (density-enhanced phosphatase-1), (GenBank accession no. NM_U10886), a.a. 1024-1306 (catalytic domain) with N-terminal GST-tag, MW=58.9 kDa, expressed in an E. coli expression system. Specific Activity: 114 U/ug. One unit will hydrolyze 1 nmol p-nitrophenyl phosphate per minute at pH 7.4 and 30C. Assay buffer: 50 mM HEPES, pH 7.4, 2 mM EDTA, 3 mM DTT, 100 mM NaCl, 50mM pNPP. Application: useful for the study of enzyme kinetics, regulation, and to dephosphorylate target substrates. Storage and Stability: Aliquot to avoid repeated freezing and thawing and store at -70C. Aliquots are stable for 6 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.