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The in vivo distribution of immunoreactive larger than tetrameric polyadenosine diphosphoribose in histone and non-histone protein fractions of rat liver.

The macromolecular association of immunoreactive naturally occurring polyadenosine diphosphoribose n greater than 4 with histones and non-histone proteins was determined with the aid of an improved method of extraction of polyadenosine diphosphoribose and a combination of radioimmunoassay and molecular filtration. More than 99% of the naturally occurring polyadenosine diphosphoribose n greater than 4 was present in rat liver in covalent association with non-histone proteins. The chain length of the polymer varied between n = 4 and n = 34. Less than 1% of naturally occurring polyadenosine diphosphoribose n greater than 4 was almost evenly distributed between histone fractions f1, f2a, f2b, and f3. Adenosine diphosphoribose polymers of relatively long chain length were also detected in the histone fractions. The covalent association of polyadenosine diphosphoribose with non-histone proteins was demonstrated by affinity chromatography.