ArticleVirus genes2024
Amsacta moorei entomopoxvirus encodes a protein kinase with dual activity and a broad substrate spectrum including two putative cellular substrates.
Article in Virus genes, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Amsacta moorei entomopoxvirus (AMEV) is a poxvirus that can only infect insects. This virus is an attractive research material because it is similar to smallpox virus. AMEV is one of many viruses that encode protein kinases that drive the host's cellular mechanisms, modifying immune responses to it, and regulating viral protein activity. We report here the functional characterization of a serine/threonine (Ser/Thr) protein kinase (PK) gene (ORF AMV197) of AMEV. Expression of the AMV197 gene in baculovirus expression system yielded a ~ 35.5 kDa protein. PK activity of expressed AMV197 was shown by standard PK assay. Substrate profiling of AMV197 protein by peptide microarray indicated that the expressed protein phosphorylated 81 of 624 substrates which belong to 28 families of PK substrates. While the hypothetical AMV197 protein phosphorylates Ser/Thr only, we demonstrated that the expressed PK also phosphorylates probes with tyrosine residues on the array which is a rare property among PKs. Pull-down assay of the AMV197 protein with the subcellular protein fractionations of Ld652 cells showed that it is using two cellular proteins (18 and 42 kDa) as novel putative substrates. Our results suggest that AMEV can regulate cellular mechanisms by phosphorylating cellular proteins through AMV197 PK. However, further experiments are needed to identify the exact role of this PK in the replication of AMEV.
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