Polyclonal sera raised to Escherichia coli -expressed movement proteins encoded by ORF 3 (p8K) and ORF 4 (p6K) of olive latent virus 1, were used for their immunodetection in infected Nicotiana benthamiana plants. In subfractionated locally infected tissues 4 days post inoculation (d.p.i.) that were analysed by Western blot, p8K was found in the fast-sedimenting fractions P1 and P30 containing membranous material and/or cell organelles and, likely, the fibrous structures mentioned below, but not in the soluble protein-containing supernatant. No p6K could be detected in these extracts. In locally inoculated leaves p8K began to accumulate from 2 d.p.i onwards reaching its peak at 4 d.p.i. Intracellular immunogold labelling of cells from locally and systemically infected tissues localized p8K primarily in fibrous inclusions made up of thin filaments with a helical structure present in the cytoplasm of locally and systemically infected cells. In systemic infections a light and scattered labelling was oberved in the cytoplasm and near the cell wall. The specific serum to p6K did not label the fibrous structures and failed to recognize its antigen in systemically and locally infected tissues except at 4 d.p.i., when scattered labelling was observed in the cytoplasm and near plasmodesmata.
Archives of Virology – Springer Journals
Published: Jul 1, 2005
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