Microinjected glutathione S-transferase Yb subunits translocate to the cell nucleus.
We have previously shown that a 30 kDa DNA-binding protein isolated from rat cell nuclei exhibits the chemical and immunological properties of glutathione S-transferase Yb subunits [Bennett, Spector & Yeoman (1986) J. Cell Biol. 102, 600-609]. It was of interest, therefore, to determine whether Yb subunits isolated from rat liver nuclei would return to nuclear fractions upon reintroduction to cell cytoplasms via red-blood-cell-mediated fusion. Labelled Yb subunits were associated with nuclear fractions 60 min after cell fusion. The microinjected protein remained associated with the nuclei for 18 h and was not extractable with low-salt washes. In addition, injected Yb subunits were found to equally distribute between extractable (56%) and residual (44%) nuclear fractions. These experiments demonstrate that glutathione S-transferase Yb subunits isolated from nuclei rapidly translocate to nuclei upon reintroduction into cell cytoplasms.
Department of Pharmacology, Baylor College of Medicine, Houston, TX 77030.
C F
CF
Bennett
L C
LC
Yeoman
D000818:Animals; D002467:Cell Nucleus / Q000201:enzymology*; D002478:Cells, Cultured; D005982:Glutathione Transferase / Q000378:metabolism*; D007527:Isoenzymes / Q000378:metabolism*; D008845:Microinjections; D051381:Rats; D013347:Subcellular Fractions / Q000201:enzymology
D007527:Isoenzymes; D005982:Glutathione Transferase