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The two proteins encoded by the cottontail rabbit papillomavirus E6 open reading frame differ with respect to localization and phosphorylation

Cottontail rabbit papillomavirus-induced tumors contain two E6-coding transcripts. A major transcript can code for a short E6 protein initiated at AUG codon 2, and a minor one could code for a long E6 initiated at AUG 1. We have identified the two proteins expressed in COS-7 cells (M. Barbosa and F. O. Wettstein, J. Virol. 61:2938-2942, 1987). The properties of the two proteins are distinctly different. The long E6 is predominantly present in the nucleus, in which it appears to be associated with the nuclear matrix. Minor portions of the long E6 are located in equal amounts in both the soluble cytoplasmic and the membrane fractions. The short E6 is a soluble cytoplasmic protein phosphorylated at serine residues.