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Nuclear localization and DNA interaction of protein disulfide isomerase ERp57 in mammalian cells

✍ Scribed by Sabina Coppari; Fabio Altieri; Anna Ferraro; Silvia Chichiarelli; Margherita Eufemi; Carlo Turano

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
203 KB
Volume
85
Category
Article
ISSN
0730-2312

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✦ Synopsis

Abstract

Protein disulfide isomerase ERp57 is localized predominantly in the endoplasmic reticulum, but is also present in the cytosol and, according to preliminary evidence, in the nucleus of avian cells. Conclusive evidence of its nuclear localization and of its interaction with DNA in vivo in mammalian cells is provided here on the basis of DNA–protein cross‐linking experiments performed with two different cross‐linking agents on viable HeLa and 3T3 cells. Nuclear ERp57 could also be detected by immunofluorescence in HeLa cells, where it showed an intracellular distribution clearly different from that of an homologous protein, located exclusively in the endoplasmic reticulum. Mammalian ERp57 resembles the avian protein in its recognition of S/MAR‐like DNA sequences and in its association with the nuclear matrix. It can be hypothesized that ERp57, which is known to associate with other proteins, in particular STAT3 and calreticulin, may contribute to their nuclear import, DNA binding, or other functions that they fulfil inside the nucleus. J. Cell. Biochem. 85: 325–333, 2002. © 2002 Wiley‐Liss, Inc.

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