Reference: Karwan RM, et al. (1990) Ribonuclease H(70) is a component of the yeast nuclear scaffold. J Cell Sci 96 ( Pt 3):451-9

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Abstract


We have used monospecific antibodies against three ribonuclease H enzymes of Saccharomyces cerevisiae to investigate their intracellular localization. Fractionation experiments, as well as immunocytochemical staining, revealed a predominantly cytoplasmic localization of the RNase H proteins of 42,000 and 70,000 Mr, whereas that of 55,000 Mr showed equal distribution between nuclei and cytoplasm. The nuclear moiety of ribonuclease H(70) was found to be a part of the yeast nuclear scaffold, as investigated by immunoblotting and antibody inhibition experiments. The 42,000 and 55,000 Mr enzymes, on the other hand, are not scaffold-associated. We conclude that RNase H(70) is part of the nuclear substructure of yeast that was previously found to maintain specific interactions with yeast chromosomal origins of replication (ARS elements).

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Karwan RM, Laroche T, Wintersberger U, Gasser SM, Binder M
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