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HeLa S3 cells contained two activities (form I and II) that degrade (ADP-ribose)n exo-glycosidically. Form I was extracted from nuclei only by sonication in high ionic strength, while form II was soluble in cytosol. The two active forms differed in chromatographic behaviors, in their Km values for (ADP-ribose)n, and in their pH and salt requirements for optimal activity, although both forms exhibited properties characteristic of (ADP-ribose)n glycohydrolase such as requirement of sulfhydryl compounds and sensitivity of ADP-ribose and cAMP. Form I and II had apparent molecular weights of 72,000 and 53,000, respectively, as determined by gel filtration on Sepharose CL-6B.
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