1887

Abstract

Summary

The La antigen is known to associate, at least transiently, with a series of small nuclear and cytoplasmic ribonucleoprotein particles (snRNPs and scRNPs), e.g. U1 and U6 snRNPs. In CV-1 cells a monoclonal antibody (MAb), directed against the La protein (La1B5), immunostained intranuclear speckles. These speckles were found to co-localize with speckles that were stained by MAbs directed against either all U snRNPs or only against U1 snRNPs. Two h after infection of CV-1 cells with herpes simplex virus type 1 (HSV-1) (strain HFEM) the staining of nuclear speckles with the anti-La MAb disappeared and the La protein was found quantitatively in the cytoplasm. In contrast nuclear speckles remained stained with the MAbs against the U snRNPs. Similar results were obtained using HSV-1 strains Lenette or 17 syn or temperature-sensitive () mutants defective either in DNA synthesis (S) or in the immediate early protein ( 175 K) (K). Later in infection the La protein returned to the nucleus. Six h after infection most of the nuclear La protein was found to localize within patchy regions. These areas seem to be related to heterogeneous nuclear RNA transcription and/or processing sites, but not to DNA replication sites.

Keyword(s): HSV-1 , La antigen and snRNPs
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/content/journal/jgv/10.1099/0022-1317-70-4-881
1989-04-01
2019-09-20
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http://instance.metastore.ingenta.com/content/journal/jgv/10.1099/0022-1317-70-4-881
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