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The polypeptide encoded by the open reading frame UL69 of human cytomegalovirus (HCMV), which is homologous to the immediate-early regulator ICP27 of herpes simplex virus, has recently been identified as a transactivator protein that exerts a broad stimulatory effect on gene expression (M. Winkler, S. A. Rice, and T. Stamminger, J. Virol. 68:3943-3954, 1994). Here, we provide evidence that pUL69 is a phosphorylated tegument protein of HCMV. This finding could be demonstrated by Western blot (immunoblot) analyses with purified virions and a specific antiserum against pUL69. These experiments revealed that one phosphorylated subform of the three pUL69 polypeptides that are synthesized in infected fibroblast cells is contained within the HCMV virion. After the treatment of purified virions with detergents, pUL69 could not be detected within the membrane fraction, suggesting that it is either a capsid or a tegument protein. Its presence within dense bodies, however, shows that pUL69 is a constituent of the viral tegument.

A specific subform of the human cytomegalovirus transactivator protein pUL69 is contained within the tegument of virus particles