Prolyl-4-hydroxylase, the enzyme which synthesizes the 4-hydroxyproline found in collagens, was purified from human placenta. For this purpose, a new purification procedure was developed. The procedure involves chromatography on two DEAE-cellulose columns in addition to the previously developed affinity column. The new procedure makes it possible to obtain homogenous enzyme from tissues which contain low concentrations of prolyl 4-hydroxylase. When applied to human placenta, the purification was about 1,000-fold. An 11,000-fold observation was that when the original affinity column procedure was applied to placenta, the eluted enzyme peak contained large amounts of immunoglobulin, probably immunoglobulin G. On the basis of this observation, a simple procedure was developed for purifying immunoglobulin from human placenta or plasma.
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