Using the yeast two-hybrid system, Epstein-Barr virus nuclear antigen 6A (EBNA6A) was found to interact with the RBP-2N isoform of RBP-J kappa. The interaction of EBNA6A and EBNA6B with RBP-2N was compared and the results indicated that EBNA6B was less efficient at interacting with RBP-2N than was EBNA6A. Deletion mutation analysis of EBNA6A identified a region involved in the interaction with RBP-2N, while analysis of RBP-2N identified a domain which interacts with EBNA6A. The region of RBP-2N to which EBNA6A binds has previously been shown to interact with EBNA2.


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