Structure of the Epstein-Barr virus oncogene BARF1

Journal of Molecular Biology
Nicolas TarbouriechWim P Burmeister

Abstract

The Epstein-Barr virus is a human gamma-herpesvirus that persistently infects more than 90% of the human population. It is associated with numerous epithelial cancers, principally undifferentiated nasopharyngeal carcinoma and gastric carcinoma. The BARF1 gene is expressed in a high proportion of these cancers. An oncogenic, mitogenic and immortalizing activity of the BARF1 protein has been shown. We solved the structure of the secreted BARF1 glycoprotein expressed in a human cell line by X-ray crystallography at a resolution of 2.3A. The BARF1 protein consists of two immunoglobulin (Ig)-like domains. The N-terminal domain belongs to the subfamily of variable domains whereas the C-terminal one is related to a constant Ig-domain. BARF1 shows an unusual hexamerisation involving two principal contacts, one between the C-terminal domains and one between the N-terminal domains. The C-terminal contact with an uncommonly large contact surface extends the beta-sandwich of the Ig-domain through the second molecule. The N-terminal contact involves Ig-domains with an unusual relative orientation but with a more classical contact surface with a size in the range of dimer interactions of Ig-domains. The structure of BARF1 is most closely rel...Continue Reading

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