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Subcellular distribution of the major immediate early proteins of human cytomegalovirus changes during infection

Institute for Developmental Research, Aichi Prefectural Colony, Kasugai, Aichi 480-03, Japan

The 72K immediate early (IE) 1 protein of human cytomegalovirus and the 68K protein, also encoded by the IE1 gene, were detected by immunoelectron microscopy using monoclonal antibodies specific for the 68K or 72K proteins. Early after infection, both proteins were localized to the nucleus, but with different localization patterns. Late after infection, both of the proteins decreased markedly in the nucleus, in which nucleocapsids appeared. Simultaneously, the 68K protein became diffusely distributed in the cytoplasm and the plasma membrane, whereas the 72K protein was distributed in the nuclear envelope and the plasma membrane. Both proteins were also observed in the coating membrane of the extracellular dense bodies.

Received 27 August 1990; accepted 14 February 1991.

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