Absence of low molecular weight DNA polymerase activity from the nuclei ofAmoeba discoides

Summary Amoeba discoides nuclear protein partially purified by passage through Sephadex G-200 showed 3 high-mol.-wt DNA polymerase activities which eluted in and just following the void volume. No low-mol.-wt (45,000 daltons) DNA polymerase activity was detected. Nuclear protein layered on 5–20% sucrose gradients also showed an absence of lowmol.-wt DNA polymerase . The void volume enzyme showed deoxyribonuclease activity, but no low-mol.-wt nuclease activity was detected.