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Purification and functional characterization of tomato mosaic virus 130K protein expressed in silkworm pupae using a baculovirus vector.
Protein Expression and Purification 2019 Februrary
Tomato mosaic virus (ToMV; genus, Tobamovirus) is a member of the alpha-like virus superfamily of positive-strand RNA viruses, which includes many plant and animal viruses of agronomical and clinical importance. The genomes of alpha-like viruses encode replication-associated proteins that contain methyltransferase, helicase and/or polymerase domains. The three-dimensional structure of the helicase domain fragment of ToMV has been determined, but the structures of the other domains of alpha-like virus replication proteins are not available. In this study, we expressed full-length ToMV replication-associated protein 130 K, which contains the methyltransferase and helicase domains, using the baculovirus-silkworm expression system and purified the recombinant protein to near homogeneity. Purified 130 K, which was stable in phosphate buffer containing magnesium ions and ATP, formed a dimer in solution and hydrolyzed nucleoside 5'-triphosphates.
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