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Journal of General Virology, Vol 80, 273-276, Copyright © 1999 by Society for General Microbiology

ARTICLES

Similarities in the genome organization of tobacco rattle virus and pea early-browning virus isolates that are transmitted by the same vector nematode

SA MacFarlane, N Vassilakos and DJ Brown
Department of Virology, Scottish Crop Research Institute, Invergowrie, Dundee, UK. s.macfarlane@scri.sari.ac.uk

Although sequence data have been obtained for several tobravirus isolates, only two of these isolates are nematode-transmissible. Tobacco rattle virus (TRV) PpK20 is transmitted by Paratrichodorus pachydermus, whereas pea early-browning virus (PEBV) TpA56 is transmitted by Trichodorus primitivus. To clarify whether differences in the genome structure of these isolates are relevant to the specificity of interactions with particular vector nematodes, or merely reflect a taxonomic difference between TRV and PEBV, we have sequenced RNA2 of a new isolate of TRV (TpO1) that is transmitted by the same vector nematode as PEBV TpA56 but is not transmitted by the nematode vector of TRV PpK20. TRV TpO1 RNA2 encodes, in 5' to 3' order, a coat protein (CP), a 9K protein, a 2b (29K) protein and a 2c (18K) protein. Amino acid sequence comparison shows that both the CP and 2b proteins of TRV TpO1 resemble more closely the analogous proteins from PEBV TpA56 than those from TRV PpK20. Also, the TRV TpO1 9K protein has similarities with the PEBV 9K protein whereas this protein is lacking in TRV PpK20.


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P. B. Visser and J. F. Bol
Nonstructural proteins of Tobacco rattle virus which have a role in nematode-transmission: expression pattern and interaction with viral coat protein
J. Gen. Virol., December 1, 1999; 80(12): 3273 - 3280.
[Abstract] [Full Text]

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S. A. MacFarlane
Molecular biology of the tobraviruses
J. Gen. Virol., November 1, 1999; 80(11): 2799 - 2807.
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