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. 1993 Dec;67(12):7215–7222. doi: 10.1128/jvi.67.12.7215-7222.1993

Three different cellular proteins bind to complementary sites on the 5'-end-positive and 3'-end-negative strands of mouse hepatitis virus RNA.

T Furuya 1, M M Lai 1
PMCID: PMC238183  PMID: 8230443

Abstract

The termini of viral genomic RNA and its complementary strand are important in the initiation of viral RNA replication, which probably involves both viral and cellular proteins. To detect the possible cellular proteins involved in the replication of mouse hepatitis virus RNA, we performed RNA-protein binding studies with RNAs representing both the 5' and 3' ends of the viral genomic RNA and the 3' end of the negative-strand complementary RNA. Gel-retardation assays showed that both the 5'-end-positive- and 3'-end-negative-strand RNA formed an RNA-protein complex with cellular proteins from the uninfected cells. UV cross-linking experiments further identified a 55-kDa protein bound to the 5' end of the positive-strand viral genomic RNA and two proteins 35 and 38 kDa in size bound to the 3' end of the negative-strand cRNA. The results of the competition assay confirmed the specificity of this RNA-protein binding. No proteins were found to bind to the 3' end of the viral genomic RNA under the same conditions. The binding site of the 55-kDa protein was mapped within the 56-nucleotide region from nucleotides 56 to 112 from the 5' end of the positive-strand RNA, and the 35- and 38-kDa proteins bound to the complementary region on the negative-strand RNA. The 38-kDa protein was detected only in DBT cells but was not detected in HeLa or COS cells, while the 35-kDa protein was found in all three cell types. The juxtaposition of the different cellular proteins on the complementary sites near the ends of the positive- and negative-strand RNAs suggests that these proteins may interact with each other and play a role in mouse hepatitis virus RNA replication.

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