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* The Wistar Institute, Philadelphia, Pennsylvania 19104; and The development of an induced transcript
environment was investigated at the supramolecular
level through comparative localization of the human
cytomegalovirus immediate early (IE) transcripts and
specific nuclear domains shortly after infection. Compact aggregates of IE transcripts form only adjacent to
nuclear domain 10 (ND10), and the viral protein IE86
accumulates exclusively juxtaposed to the subpopulation of ND10 with transcripts. The stream of transcripts
is funneled from ND10 into the spliceosome assembly
factor SC35 domain through the accumulation of IE86
protein, which recruits some components of the basal
transcription machinery. Concomitantly the IE72 protein binds to ND10 and later disperses them. The domain containing the zinc finger region of IE72 is essential for this dispersal. Positional analysis of proteins IE86 and IE72, IE transcripts, ND10, the spliceosome
assembly factor SC35, and basal transcription factors
defines spatially and temporally an immediate transcript environment, the basic components of which exist in the cell before viral infection, providing the structural environment for the virus to usurp.
Department of Microbiology and Immunology, Eastern Virginia
Medical School, Norfolk, Virginia 23501
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