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Evidence for the Involvement of the 58K and 48K Proteins in the Intercellular Movement of Cowpea Mosaic Virus

¹ Department of Virology, Agricultural University, Binnenhaven 11, 6709 PD Wageningen
and² Department of Molecular Biology, Agricultural University, De Dreijen 11, 6703 BC Wageningen, The Netherlands

Infection of cowpea cells with cowpea mosaic virus (CPMV) is accompanied by the appearance of tubular structures containing virus-like particles which protrude from or penetrate the cell wall. Immunogold labelling of sections of infected cells using antisera against a CPMV M RNA translation products, and Protein A-gold, showed that the 58K and/or 48K tentative transport proteins of CPMV were located in or on these tubular structures. Furthermore, these proteins were detected in small electron-dense areas near the tail-end of the tubules. The possible function of these structures in virus movement from cell to cell is discussed.

Received 14 June 1989; accepted 26 September 1989.