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The herpes simplex virus 1 US11 protein is an RNA-binding regulatory protein that specifically and stably associates with 60S ribosomal subunits and nucleoli and is incorporated into virions. We report that US11/ beta-galactosidase fusion protein expressed in bacteria bound to rRNA from the 60S subunit and not the 40S subunit. This binding reflects the specificity of ribosomal subunit association. Analyses of deletion mutants of the US11 gene showed that specific RNA binding activity, nucleolar localization, and association with 60S ribosomal subunits were found to map to the amino acid sequences of the carboxyl terminus of US11 protein, suggesting that these activities all reflect specific binding of US11 to large subunit rRNA. The carboxyl-terminal half of the protein consists of a regular tripeptide repeat of the sequence RXP and constitutes a completely novel RNA-binding domain. All of the mutant US11 proteins could be incorporated into virus particles, suggesting that the signal for virion incorporation either is at the amino-terminal four amino acids or is redundant in the protein.

Type

Journal article

Journal

J Virol

Publication Date

05/1996

Volume

70

Pages

2842 - 2851

Keywords

Base Sequence, Binding Sites, Cell Line, Cell Nucleolus, Gene Deletion, HeLa Cells, Herpesvirus 1, Human, Humans, Models, Structural, Molecular Sequence Data, Mutagenesis, Oligodeoxyribonucleotides, Plasmids, RNA, Ribosomal, RNA-Binding Proteins, Recombinant Fusion Proteins, Recombination, Genetic, Restriction Mapping, Ribosomes, Tumor Cells, Cultured, Viral Proteins, beta-Galactosidase