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The helper component-proteinase (HC-Pro) of Cowpea aphid-borne mosaic virus (CABMV) was expressed in Escherichia coli and used to obtain HC-Pro antiserum that was used as an analytical tool for HC-Pro studies. The antiserum was used in immunofluorescence assays to study the subcellular location of HC-Pro expressed with other viral proteins in cowpea protoplasts in a natural CABMV infection, or in...
Nicotiana benthamiana plants were engineered to express sequences of the helper component-proteinase (HC-Pro) of Cowpea aphid-borne mosaic potyvirus (CABMV). The sensitivity of the transgenic plants to infection with parental and heterologous viruses was studied. The lines expressing HC-Pro showed enhanced symptoms after infection with the parental CABMV isolate and also after infection with a heterologous...
In this study we have performed a mutational analysis of the cowpea mosaic comovirus (CPMV) genome-linked protein VPg to discern the structural requirements necessary for proper functioning of VPg. Either changing the serine residue linking VPg to RNA at a tyrosine or a threonine or changing the position of the serine from the N-terminal end to position 2 or 3 abolished virus infectivity. Some of...
The jellyfish green fluorescent protein (GFP) coding sequence was used to replace the coat protein (CP) genes in a full-length cDNA clone of CPMV RNA-2. Transcripts of this construct were replicated in the presence of RNA-1 in cowpea protoplasts, and GFP expression could be readily detected by fluorescent microscopy. It was not possible to infect cowpea plants with these transcripts, but combined...
The coding regions for cowpea mosaic virus (CPMV) capsid proteins VP37 and VP23 were introduced separately into a transient plant expression vector containing an enhanced CaMV 35S promoter. Significant expression of either capsid protein was observed only in protoplasts transfected simultaneously with both constructs. Immunosorbent electron microscopy revealed the presence of virus-like particles...
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