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Grapevine leafroll-associated virus 3 (GLRaV-3), the main viral species of the grapevine leafroll complex, causes yield and quality reduction in grapes (Vitis spp.). The coat protein gene was RT-PCR-amplified from total RNA extracted from infected grapevine leaves and the amplified fragment was cloned and completely sequenced. The fragment was subsequently subcloned into the pRSET-C expression vector. The recombinant plasmid was used to transform Escherichia coli BL21:DE3 and express the capsid protein. The coat protein, fused to a 6 His-tag, was purified by affinity chromatography using an Ni-NTA resin. The identity of the purified protein was confirmed by SDS-PAGE and Western blot. The in vitro-expressed protein was quantified and used for rabbit immunizations. The antiserum was shown to be sensitive and specific for the detection of GLRaV-3 in grapevine extracts in Western blot and DAS-ELISA assays, with no unspecific or heterologous reactions against other non-serologically related viruses being observed. Grapevine leafroll-associated virus 3 (GLRaV-3), a principal espécie viral do complexo do enrolamento da folha da videira (Vitis spp.), causa reduções no rendimento e na qualidade da uva. O gene da proteína capsidial foi amplificado via RT-PCR a partir de RNA total, extraído de folhas de videira infectadas. O fragmento amplificado foi clonado e completamente seqüenciado. Em seguida, o fragmento foi subclonado no vetor de expressão pRSET-C. O plasmídeo recombinante foi utilizado para a expressão da proteína capsidial em Escherichia coli BL21:DE3. A proteína capsidial, ligada a uma cauda de 6-His, foi purificada por cromatografia de afinidade em coluna de Ni-NTA. A identidade da proteína purificada foi confirmada em SDS-PAGE e Western blot e, após quantificação, foi utilizada para imunizar coelhos. O anti-soro mostrou-se sensível e específico para a detecção do GLRaV-3 em extratos de videira por Western blot e DAS-ELISA, não tendo sido observadas reações inespecíficas ou heterólogas contra outros vírus sorologicamente não relacionados

Expression of Grapevine leafroll-associated virus 3 coat protein gene in Escherichia coli and production of polyclonal antibodies