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. 1991 Oct;65(10):5250–5259. doi: 10.1128/jvi.65.10.5250-5259.1991

Regulation of the biosynthesis of subgroup C adenovirus protein IVa2.

N Winter 1, J C D'Halluin 1
PMCID: PMC249004  PMID: 1895382

Abstract

The IVa2 gene is located between 16 and 11.3 map units on the left strand of the adenovirus type 5 (Ad5) genome. The coded RNA contains an intron of 277 nucleotides. To determine whether protein IVa2 is synthetized during productive infection and to obtain an immunological reagent to study its function, we prepared antibodies directed to 414 amino acids of protein IVa2 fused to the N-terminal domain of Staphylococcus aureus protein A. Western immunoblot analysis of viral proteins demonstrates that protein IVa2 is a minor component of mature viral particles and that it is also present in assembly intermediates and young virions. Thus, contrary to a previous report (H. Persson, B. Mathisen, L. Philipson, and U. Pettersson, Virology 93:198-208, 1979), protein IVa2 is not related to the 50-kDa polypeptide, a scaffolding protein present in assembly intermediates. The biosynthesis of protein IVa2 during productive infection was examined. Time course studies using immunofluorescence analysis with polyclonal antibodies targeted to protein IVa2 revealed that this protein is first synthesized at 12 h in a few cells exhibiting very striking fluorescence. Synthesis continues until at least 24 h postinfection. When hydroxyurea is added, protein IVa2 is not detected. In cells infected with mutant H5 ts125, blocked at the nonpermissive temperature (40 degrees C) in viral DNA replication, protein IVa2 is overexpressed. These results suggest that protein IVa2 synthesis requires cellular rather than viral DNA replication. RNase protection assay results indicate that hydroxyurea inhibits protein IVa2 synthesis at the transcriptional level. Thus, overexpression of protein IVa2 in H5 ts125-infected cells may be regulated at the translational level.

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