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The TOM1 and TOM3 genes of Arabidopsis thaliana encode homologous proteins that are required for tobamovirus multiplication. Although the A. thaliana genome encodes another TOM1-like gene, THH1, the tobamovirus coat protein (CP) does not accumulate to a detectable level in the tom1 tom3 double mutant. Here, double and triple mutants of tom1, tom3 and thh1 were generated to investigate whether THH1 functions to support tobamovirus multiplication. In the tom1 thh1 double mutant, the tobamovirus CP accumulated to a level that was detectable, but lower than that in the tom1 single mutant. In tom1 tom3 double-mutant lines overexpressing THH1, the tobamovirus CP accumulated to a level similar to that observed in wild-type plants. These results suggest that THH1 supports tobamovirus multiplication, but to a lesser extent than TOM1 and TOM3. The expression level of THH1 is lower than that of TOM1 and TOM3, which might explain the smaller contribution of THH1 to tobamovirus multiplication.

Involvement of THH1, an Arabidopsis thaliana homologue of the TOM1 gene, in tobamovirus multiplication