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5′‐(4‐Aminophenyl‐phosphoryl)‐uridine‐2′(3′)‐phosphate was synthesized and coupled to Sepharose by activation with cyanogen bromide. This conjugate was used as a specific adsorbent for purification of ribonuclease A by affinity chromatography. Totally reduced and oxidized RNase preparations which are enzymatically inactive were not adsorbed or retarded by the RNase‐specific column, while S‐protein is strongly retarded.
Wilchek et al. (Mon,) studied this question.