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A Non-capsid Protein Associated with Unencapsidated Virus RNA in Barley Infected with Barley Stripe Mosaic Virus

Agricultural Research Service, U.S. Department of Agriculture and Department of Plant Pathology, Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln, Nebraska 68583, U.S.A.

Barley tissue with an acute systemic infection of barley stripe mosaic virus contained a large amount of unencapsidated virus RNA which was stable in extracts made in ribosome isolation buffer. The virus RNA in ribosome preparations sedimented in a broad band at 80S to 100S in sucrose gradients, which is less than the virion sedimentation rate of 180S to 200S. A protein of apparent M_r 60000, which sedimented with the virus RNA, was present in ribosome extracts from infected plants but absent from those from uninfected plants. The protein is probably a virus protein because its apparent molecular weight varied slightly with the strain of virus. The structure containing the M_r 60000 protein did not sediment in sucrose gradients in a compact zone as would be expected for a particle of uniform size. The M_r 60000 protein was present at a concentration equal to or slightly higher (up to 400 µg/g leaf tissue) than the unencapsidated virus RNA (up to 300 µg/g leaf tissue). Sedimentation results support the conclusion that the virus RNA and the M_r 60000 protein were combined in polydispersed nucleoprotein particles which may or may not have been attached to ribosomes or ribosome subunits. The M_r 60000 protein was not serologically related to the capsid protein. Gold-labelled antibodies to the M_r 60000 protein stained the cytoplasm in thin sections of infected cells but not that of uninfected cells. However, no distinct immunogold-labelled particle could be identified as the presumed nucleoprotein.

Keywords: BMSV, unencapsidated RNA, hordeivirus

Received 10 July 1987; accepted 23 November 1987.

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