Nuclear particles containing RNA polymerase III complexes associated with the junctional plaque protein plakophilin 2.

Division of Cell Biology, German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
Plakophilin 2, a member of the arm-repeat protein family, is a dual location protein that occurs both in the cytoplasmic plaques of desmosomes as an architectural component and in an extractable form in the nucleoplasm. Here we report the existence of two nuclear particles containing plakophilin 2 and the largest subunit of RNA polymerase (pol) III (RPC155), both of which colocalize and are coimmunoselected with other pol III subunits and with the transcription factor TFIIIB. We also show that plakophilin 2 is present in the pol III holoenzyme, but not the core complex, and that it binds specifically to RPC155 in vitro. We propose the existence of diverse nuclear particles in which proteins known as plaque proteins of intercellular junctions are complexed with specific nuclear proteins.
Mesh Terms:
Animals, Cell Line, Cell Nucleus, Cell Nucleus Structures, Humans, Plakophilins, Protein Binding, Proteins, RNA Polymerase III
Proc. Natl. Acad. Sci. U.S.A. Jul. 03, 2001; 98(14);7795-800 [PUBMED:11416169]
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