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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Characterization of an oligomerization domain and RNA-binding properties on rotavirus nonstructural protein NS34.
Virology 1992 September
Intermolecular interactions between polypeptide chains often play essential roles in such biological phenomena as replication, transcription, translation, transport, ligand binding, and assembly. We have initiated studies of the functions of the rotavirus SA114F gene 7 product by sequence analysis and expression in insect cells. This nonstructural protein, NS34, is a slightly acidic protein, and its secondary structure is predicted to be 78% alpha-helix, with several heptad repeats of hydrophobic amino acids being present in its carboxy half. NS34 was found in oligomers when analyzed in insect cells, in SA11-infected MA104 cells, and in cell-free translation reactions. Investigation of the multiple electrophoretically distinct forms of NS34 showed they were all composed of homooligomers. Deletion mutants constructed and tested for oligomerization showed that the carboxy terminus of the protein, containing the predicted heptad repeats, was responsible for oligomerization. A basic region present in NS34 of group A rotaviruses, found to be 40% conserved in NS34 of group C rotavirus, is a candidate for a functional domain of this protein. NS34, which was found to be associated with the cytoskeleton fraction of cells, also interacts with viral RNA. These results make it likely that NS34 plays a central role in the replication and assembly of genomic RNA structures.
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