Particulate DNA polymerase from the cytoplasm of Xenopus laevis oocytes.


A DNA polymerase has been partially purified and characterized from Xenopus laevis stage 6 oocytes. The enzyme is present only in the cytoplasm and has been shown to be able to copy Poly(A) x oligo(dT), to be sensitive to N-ethylmaleimide, and to sediment faster than 4 S in high salt glycerol gradient. The enzyme can be extracted from particulate material which has a density in sucrose gradient ranging from 1.200 to 1.225 g/cc. This particulate material is identified by its ability to use Poly(A) x oligo(dT) as template in an exogenous DNA polymerase reaction and by its endogenous DNA synthesizing capacity.




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