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Copper Chelate Affinity Chromatography of Human Fibroblast and Leucocyte Interferons

Departent of Viral Oncology Roswell Park Memorial Institute, Buffalo, New York 14263, U.S.A.

Human fibroblast and human leucocyte interferons display a strong affinity for the copper chelate of bis-carboxymethyl amino agarose, binding tenaciously over a wide pH range (7.4 to 4.0). Their binding is apparently irreversible on a sorbent saturated with copper (24.8 µmol of Cu²⁺/ml of column bed). However, both interferons can be partially recovered from sorbents of lower copper content, prepared by leaching the columns with sodium citrate at pH 9.0. The recovery of fibroblast interferon from a leached sorbent (5.8 µmol of Cu²⁺/ml of column bed) is about 30% and that of leucocyte interferon about 60%. Moreover, the strength of binding of leucocyte interferon can be modulated by leaching copper chelate-agarose with citrate of varying concentration.

Received 25 September 1978; accepted 16 January 1979.