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Substrate specificity of human metallocarboxypeptidase D: Comparison of the two active carboxypeptidase domains

Fig 2

Expression and purification of CPD.

(A) Schematic diagram of the strategy for expression and purification of rhCPD and mutants. Protein expression was performed by transient transfection of suspension-growing HEK293F cells. Extracellular medium was collected after 7 days incubation, followed by purification of the recombinant proteins in three steps; (1) hydrophobic interaction chromatography using a Butyl 650-M, (2) affinity chromatography using anti-Strep-tag resin, and (3) gel filtration chromatography. (B) Coomassie-stained SDS–PAGE showing the purity of recombinant CPD proteins.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0187778.g002