Processing of the herpes simplex virus assembly protein ICP35 near its carboxy terminal end requires the product of the whole of the UL26 reading frame

Valerie G. Preston, Frazer J. Rixon, Iris M. McDougall, Mark McGregor, Muhannad F. Al Kobaisi

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Abstract

The herpes simplex virus (HSV) type 1 assembly protein ICP35 consists of a family of polypeptides, ranging in molecular weight from about 45,000-39,000. The lower molecular weight forms of ICP35 are derived from the higher molecular weight species by slow post-translational modification. The reading frame of gene UL26 and the region within this gene which exhibited homology to the cytomegalovirus assembly protein, the analogous protein to ICP35, were expressed separately under immediate-early (IE) gene regulation in a HSV vector containing a temperature-sensitive mutation in the major transcriptional regulator Vmwt 75. Monoclonal antibody specific for ICP35 immunoprecipitated several polypeptides with molecular weights around 75,000 from extracts of cells infected with a recombinant expressing the IE gene UL26 at the nonpermissive temperature (NPT). These results suggested that the UL26 gene specified a protein distinct from ICP35 but which had some antigenic sites in common with ICP35. In extracts of cells infected at the NPT with a recombinant expressing only the carboxy terminal half of UL26 coding sequences, the monoclonal antibody immunoprecipitated large amounts of the high molecular weight forms of ICP35. The lower molecular weight processed forms of ICP35, however, were not detectable. When cells were coinfected with both recombinants ICP35 was processed to its lower molecular weight forms. This processing step, which occurred near the carboxy terminus of ICP35, was not dependent on capsid formation. The work, together with previous information on the processing of the CMV assembly protein, suggests that UL26 product may be a protease.

Original languageEnglish
Pages (from-to)87-98
Number of pages12
JournalVirology
Volume186
Issue number1
DOIs
Publication statusPublished - 1992

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Virus Assembly
Reading Frames
Simplexvirus
Molecular Weight
Proteins
Immediate-Early Genes
Cell Extracts
Temperature
Monoclonal Antibodies
Genes
Peptides
Capsid
Human Herpesvirus 1
Post Translational Protein Processing
Automatic Data Processing
Peptide Hydrolases
Mutation

ASJC Scopus subject areas

  • Virology

Cite this

Processing of the herpes simplex virus assembly protein ICP35 near its carboxy terminal end requires the product of the whole of the UL26 reading frame. / Preston, Valerie G.; Rixon, Frazer J.; McDougall, Iris M.; McGregor, Mark; Al Kobaisi, Muhannad F.

In: Virology, Vol. 186, No. 1, 1992, p. 87-98.

Research output: Contribution to journalArticle

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