Abstract
Cohn Fraction IV-1 (CFIV-1) is a by-product (often discarded) of a plasma fractionation process. It retains 90% of Protein C (PC) of plasma but contains several coagulants structurally homologous to PC. Of these coagulants, Factor II (FII) has the longest half-life (12 times of PC) and largest quantity (9 times of PC) in CFIV-1. Current purification process for PC is by immunoaffinity chromatography using monoclonal antibodies, which is very expensive. Immobilized metal affinity chromatography (IMAC) is an inexpensive process that uses metal ions to adsorb proteins via their surface histidines. Affinity of PC to the metal ions in IMAC is higher than that of FII because PC has 15 surface histidines and FII has 5. Two important factors in an IMAC process are pH and imidazole concentration. PH controls protonation of histidine, and imidazole, a histidine analog, competitively reacts with metal ions. The effects of pH and imidazole on adsorption and elution of PC and FII during IMAC process were studied. The effect of pH on PC and FII adsorption was similar within the range of 6.0 and 8.0. At concentrations below 15 mM imidazole, little PC or FII eluted. At 15 and 20 mM imidazole 2.5% of PC was eluted, while 20-30% of FII was eluted.
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Lee, J.J., Bruley, D.F., Kang, K.A. (2008). Effect Of Ph And Imidazole On Protein C Purification From Cohn Fraction Iv-1 By Imac. In: Maguire, D.J., Bruley, D.F., Harrison, D.K. (eds) Oxygen Transport to Tissue XXVIII. Advances in Experimental Medicine and Biology, vol 599. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-71764-7_9
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DOI: https://doi.org/10.1007/978-0-387-71764-7_9
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