title: Involvement of THH1, an Arabidopsis thaliana homologue of the TOM1 gene, in tobamovirus multiplication.
abstract: 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.
authors.affiliation: Plant-Microbe Interactions Research Unit, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan.
authors.forename: Koki
authors.initials: K
authors.lastname: Fujisaki
authors.affiliation: Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.
authors.forename: Gerald B
authors.initials: GB
authors.lastname: Ravelo
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-8589, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Naito
authors.affiliation: CREST, Japan Science and Technology Corporation, Kawaguchi 322-0012, Japan.|Plant-Microbe Interactions Research Unit, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ishikawa
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000821:virology*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D036022:Capsid Proteins / Q000032:analysis; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology; D015870:Gene Expression; D023061:Gene Order; D008565:Membrane Proteins / Q000235:genetics / Q000502:physiology; D008969:Molecular Sequence Data; D009154:Mutation; D012333:RNA, Messenger / Q000032:analysis; D017385:Sequence Homology; D017898:Tobamovirus / Q000502:physiology*; D014779:Virus Replication
chemical_list: D029681:Arabidopsis Proteins; D036022:Capsid Proteins; D002352:Carrier Proteins; D008565:Membrane Proteins; D012333:RNA, Messenger; C513389:THH1 protein, Arabidopsis; C413802:TOM1 protein, Arabidopsis; C449195:TOM3 protein, Arabidopsis