EBNA Relevant functions Examples of major interactions Evidence for role in cell transformation References
EBNA-1 Important for the maintenance of viral episomes, viral DNA replication, and transcriptional activation of latent EBV genomes; implicated in cell immortalization and transformation; implicated in immune evasion. HAUSP (USP7), Karyopherins 2 α and β; TAP/p32 Yes [87-93]
EBNA-2 Activation of viral and cellular promoters PU.1; CBF1/ RBP-J kappa Yes [94-97]
EBNA-3A (EBNA-3) Repression of the CBF1/RBP-J kappa dependent transcription CBF1/RBP-J kappa; RBP-2N Yes [98, 101]
EBNA-3B (EBNA-4) - CBF1/RBP-J kappa; RBP-2N No [101].
EBNA-LP (EBNA-5) Co-activation of EBNA-2-dependent transcription Hsp27; Hsp70 (Hsp72); Hsc70 (Hsp73); HAX-1; HA95; alpha & beta tubulins; prolyl-4-hydroxylase alpha-1 subunit; p14ARF; Fte-1/S3a Yes [102-104]
EBNA-3C (EBNA-6) Repression of the CBF1/RBP-J kappa dependent transcription CBF1/RBP-J kappa; RBP-2N Yes [99-101]
CBF1: Centromere Binding Factor 1; HAUSP: Herpes Virus-Associated Ubiquitin-Specific Protease (USP7); HAX-1: HCLS1-Associated Protein X-1; HSP: Heath Shock Proteins; RBP: Recombining Binding Protein Suppressor of Hairless; RBP-2N: Recombination Signal Sequence-Binding protein 2N; TAP, Transporrter Associated with Antigen Processing
Table 2: Functions and interactions of the EBV nuclear antigens (EBNA).