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PMID: 8390666 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

EBNA-5, an Epstein-Barr virus-encoded nuclear antigen, binds to the retinoblastoma and p53 proteins.

Szekely L, Selivanova G, Magnusson KP, Klein G, Wiman KG

Abstract

Epstein-Barr virus (EBV) immortalized human lymphoblastoid cell lines express six virally encoded nuclear proteins, designated EBV nuclear antigens 1-6 (EBNA-1-6). We show that the EBNA-5 protein (alternatively designated EBNA-LP) that is required for B-cell transformation can form a molecular complex with the retinoblastoma (RB) and p53 tumor suppressor proteins. Using EBNA-5 deletion mutants, we have found that a 66-amino acid-long peptide, encoded by the W repeat of the EBV genome, is sufficient for binding. Point mutations of RB and p53 that inhibit their complexing with other DNA viral oncoproteins do not affect their binding to EBNA-5. p53 competes with RB for EBNA-5 binding. Our data suggest that the mechanisms involved in EBV transformation may include impairment of RB and p53 function.

MeSH Terms
Amino Acid Sequence Antibodies, Monoclonal Antigens, Viral/biosynthesis,metabolism Binding Sites Blotting, Western Burkitt Lymphoma DNA-Binding Proteins/biosynthesis,metabolism Epstein-Barr Virus Nuclear Antigens Glutathione Transferase/metabolism Herpesvirus 4, Human/immunology,metabolism Humans Leukemia, Promyelocytic, Acute Molecular Sequence Data Mutagenesis, Site-Directed Peptides/chemical synthesis Recombinant Fusion Proteins/metabolism Retinoblastoma Protein/metabolism Sequence Deletion Transfection Tumor Cells, Cultured Tumor Suppressor Protein p53/metabolism
Chemicals
Antibodies, Monoclonal Antigens, Viral DNA-Binding Proteins Epstein-Barr Virus Nuclear Antigens Peptides Recombinant Fusion Proteins Retinoblastoma Protein Tumor Suppressor Protein p53 Glutathione Transferase
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Szekely L
Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden.
Selivanova G
Magnusson K P
Klein G
Wiman K G
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33 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1993-06-15
Pages
5455-9
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC46739
Subset
IM
Grants
NCI NIH HHS · 2 R01 CA14054-19 · United States
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