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• W2017296791 abstract "Some geminiviruses encode a small protein, AC4, whose role in pathogenesis has only recently attracted attention. A few studies have shown that this protein is involved in pathogenesis and suppresses RNA silencing. Here, using Nicotiana benthamiana, we show that East African cassava mosaic Cameroon virus (EACMCV) AC4 is a pathogenicity determinant and that it suppresses the systemic phase of RNA silencing. Furthermore, confocal imaging analyses show that it binds preferentially to the plasma membrane as well as to cytosolic membranes including the perinucleus but is excluded from the nucleus. A computational examination of the AC4 protein encoded by the EACMCV, a bipartite geminivirus, shows that it encodes a consensus N-myristoylation motif and is likely posttranslationally myristoylated and palmitoylated. Replacement of Gly-2 and Cys-3 (sites of posttranslational attachment of myristic and palmatic acids, respectively) with alanine affected AC4 membrane binding and pathogenesis. Furthermore, replacement of Ile-5, a nonessential myristoylation residue, with alanine did not affect AC4 function. Together, these data indicate that EACMCV AC4 is likely dually acylated at Gly-2 and Cys-3 and that these modifications are intrinsic signals for membrane targeting and pathogenesis. This is the first report of a membrane protein to be involved in pathogenesis and RNA silencing suppression." @default.
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• W2017296791 date "2007-04-01" @default.
• W2017296791 modified "2023-10-16" @default.
• W2017296791 title "The Consensus <i>N</i>-Myristoylation Motif of a Geminivirus AC4 Protein Is Required for Membrane Binding and Pathogenicity" @default.
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• W2017296791 doi "https://doi.org/10.1094/mpmi-20-4-0380" @default.
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