Human Cytomegalovirus ICP22, the Product of the HWLF1 Reading Frame, Is an Early Nuclear Protein that Is Released from Cells

Publisher Website
Google Scholar
Abstract
Summary We employed a murine monoclonal antibody (CH41) and a λgt11 library of human cytomegalovirus (CMV) DNA fragments to map the gene for a viral protein, denoted infected cell protein (ICP) 22, to the HWLF1 open reading frame in the S component of the CMV genome (0.92 to 0.93 map units). By using antibody CH41 in immunofluorescence, immunoprecipitation and immunoblotting analyses, ICP22 was readily detected as a β (delayed early) gene product during viral growth. The cellular localization of this protein was found to be nuclear by immunofluorescence analysis; however, it partitioned with the cytoplasm when cells were fractionated with non-ionic detergents. Analysis of cell-free medium showed that a proportion of ICP22 was released from cells as a soluble protein at both early (24 h) and late (72 to 120 h) times in infection. The function of this protein which has such diverse characteristics remains unknown.

This publication has 21 references indexed in Scilit: