Poly(ADP‐ribose) polymerase is a zinc metalloenzyme

Abstract
Purified poly(ADP-ribose) polymerase was inhibited by 1,10-phenanthroline at pH + and competitive with DNA. The binding of DNA to the enzyme was unaffected by the inhibitor. These results suggest that a metal-containing site is involved as part of the interaction of DNA and poly(ADP-ribose) polymerase.

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