Inhibition of ADP-ribosylation of histone H1 by analogs of diadenosine 5?, 5?-p1,p4-tetraphosphate

Abstract
The effects of analogs of diadenosine 5′,5‴-p1,p4-tetraphosphate (Ap4A) were examined on the ADP-ribosylation reaction of histone Hl catalysed by purified bovine thymus poly(ADP-ribose)transferase. Among the compounds tested, εAp4A and ApCH2PPPA were shown to be the most efficient inhibitors of the enzyme. From kinetic studies of their action, it appears that εAp4A and ApCH2pppA might be ‘mixed type’ inhibitors.

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