The cellular localization of the Epstein-Barr virus-encoded RK-BARF0 protei
n was analyzed by fluorescence microscopy and immunoblotting, The recombina
nt RK-BARF0 protein was found to be tightly bound to nuclear structures, wh
ereas 16- to 20-kDa RK-BARF0 derivatives, generated by differential splicin
g of the RK-BARF0 transcript, were present throughout the cell. Moreover, a
previously generated anti-RK-BARF0 rabbit serum was found to cross-react w
ith cellular proteins, showing that the previously identified 30- to 35-kDa
membrane-associated proteins do not represent RK-BARF0.