Epstein-Barr virus-encoded EBNA-5 binds to Epstein-Barr virus-induced Fte1/S3a protein

Item Type:	Article
Title:	Epstein-Barr virus-encoded EBNA-5 binds to Epstein-Barr virus-induced Fte1/S3a protein
Creators Name:	Kashuba, E. and Yurchenko, M. and Szirak, K. and Stahl, J. and Klein, G. and Szekely, L.
Abstract:	Epstein-Barr virus (EBV) transforms resting human B cells into immortalized immunoblasts. EBV-encoded nuclear antigens EBNA-5 (also called EBNA-LP) is one of the earliest viral proteins expressed in freshly infected B cells. We have recently shown that EBNA-5 binds p14ARF, a nucleolar protein that regulates the p53 pathway. Here, we report the identification of another protein with partially nucleolar localization, the v-fos transformation effector Fte-1 (Fte-1/S3a), as an EBNA-5 binding partner. In transfected cells, Fte-1/S3a and EBNA-5 proteins showed high levels of colocalization in extranucleolar inclusions. Fte-1/S3a has multiple biological functions. It enhances v-fos-mediated cellular transformation and is part of the small ribosomal subunit. It also interacts with the transcriptional factor CHOP and apoptosis regulator poly(ADP-ribose) polymerase (PARP). Fte-1/S3a is regularly expressed at high levels in both tumors and cancer cell lines. Its high expression favors the maintenance of malignant phenotype and undifferentiated state, whereas its down-regulation is associated with cellular differentiation and growth arrest. Here, we show that EBV-induced B cell transformation leads to the up-regulation of Fte-1/S3a. We suggest that EBNA-5 through binding may influence the growth promoting, differentiation inhibiting, or apoptosis regulating functions of Fte-1/S3a.
Keywords:	Cell Transformation, EBNA-5, Epstein-Barr Virus, Fte-1/S3a Ribosomal Protein, Yeast Two-Hybrid System
Source:	Experimental Cell Research
ISSN:	0014-4827
Publisher:	Elsevier
Volume:	303
Number:	1
Page Range:	47-55
Date:	1 January 2005
Official Publication:	https://doi.org/10.1016/j.yexcr.2004.08.025
PubMed:	View item in PubMed

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