The flacherie disease in the silkworm is caused by the infectious flacherie virus (IFV). IFV relies on its 5' region of genomic RNA to recruit host-related factors to implement viral translation and replication. To identify host proteins bound to the 5'-region of IFV RNA and identify proteins important for its function, mass spectrometry was used to identify proteins from silkworm midgut extracts that were obtained using RNA aptamer-labeled 5' region of IFV RNA. We found 325 protein groups (unique peptide≥2) bound to the 5' region of IFV RNA including translation-related factors (16 ribosomal subunits, 3 eukaryotic initiation factor subunits, 1 elongation factor subunit and 6 potential internal ribosome entry site trans-acting factors), cytoskeleton-related proteins, membrane-related proteins, metabolism enzymes, and other proteins. These results can be used to study the translation and replication related factors of IFV interacting with host silkworm and to control flacherie disease in silkworm.
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