Degradation of nuclear proteins: studies on transplanted B82 cell karyoplast proteins.

Abstract

Karyoplasts were prepared from B82 cells (thymidine kinase deficient mouse L cells) by cytochalasin B mediated enucleation. Morphological measurements show that the nucleus constitutes 89% of a karyoplast by volume. Homokaryons were obtained by Sendai virus mediated karyoplast-B82 cell fusion. Transplanted nuclei were not destroyed catastrophically but were maintained intracellularly for at least 140 h. Transplanted nuclear proteins were degraded with an average half-life of 84 +/- 7 h by processes partially sensitive to inhibition by NH4Cl (50%) and leupeptin (30%). The data therefore suggest that some nuclear proteins are translocated to the cytoplasm for lysosomal degradation.

Cite this paper

@article{Fernig1987DegradationON, title={Degradation of nuclear proteins: studies on transplanted B82 cell karyoplast proteins.}, author={David G Fernig and Robert J. Mayer}, journal={FEBS letters}, year={1987}, volume={210 2}, pages={165-8} }