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Journal of General Virology, Vol 80, 997-1008, Copyright © 1999 by Society for General Microbiology
ARTICLES |
KN Leppard and RD Everett
Department of Biological Sciences, University of Warwick, Coventry, UK. Keith.Leppard@warwick.ac.uk
Three early proteins expressed by adenovirus type 5, E1b 55K, E4 Orf3 and E4 Orf6, are involved in regulating late viral gene expression. It has previously been shown that 55K associates with Orf6. Here we show that 55K also associates with Orf3 and that this interaction is necessary for 55K to localize to the nuclear matrix fraction of the cell. From our data, we infer that the Orf3 and Orf6 interactions with 55K may be mutually exclusive. The Orf3 protein is also known to associate with and cause the reorganization of cell nucleus structures known as ND10 or PODs. Consistent with the observed increase in the biochemical interaction between 55K and Orf3 in the absence of Orf6, the 55K association with Orf3 in ND10 was also found to increase in the absence of Orf6. The most studied cellular component of ND10 is PML, a complex protein present in a range of isoforms, some of which are modified by conjugation to the small ubiquitin-like protein PIC-1. The pattern of PML isoforms was altered in adenovirus-infected cells, in that a number of additional isoform bands appeared in an Orf3-dependent manner, one of which became predominant later in infection. As for ND10 reorganization, neither Orf6 nor 55K was required for this effect. Therefore it is likely that these changes in PML are related to the changes in ND10 structure that occur during infection.
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