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Journal of General Virology, Vol 79, 1411-1413, Copyright © 1998 by Society for General Microbiology

ARTICLES

Identification and characterization of RNA-binding activities of avian reovirus non-structural protein sigmaNS

HS Yin and LH Lee
Department of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan, Republic of China.

Cytoplasmic extracts prepared from avian reovirus (ARV) strain S1133- infected chicken embryo fibroblasts were examined for the presence of RNA-binding proteins in order to identify and characterize ARV RNA- binding proteins. Analysis of binding activity to poly(A)-Sepharose indicated that infected cells contained significant amounts of a protein that co-migrated with ARV protein sigmaNS present in total virus-infected cell extracts. Determination of the N-terminal amino acid sequence of several peptide fragments generated by V8 protease digestion of the poly(A)-Sepharose-purified protein confirmed that this viral protein was sigmaNS. Competition assays showed that single- stranded RNA from the unrelated avian pathogen infectious bursal disease virus was able to compete for binding of sigmaNS to poly(A)- Sepharose. These data suggest that ARV sigmaNS binds to single-stranded RNA in a nucleotide sequence non-specific manner and is functionally similar to its counterpart specified by mammalian reovirus.


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