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Journal of Virology, March 2002, p. 2491-2497, Vol. 76, No. 5
0022-538X/02/$04.00+0     DOI: 10.1128/jvi.76.5.2491-2497.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Complete Inhibition of Tobamovirus Multiplication by Simultaneous Mutations in Two Homologous Host Genes

*** Takuya Yamanaka,1,{dagger} Takahiro Imai,1 Rena Satoh,1 Arata Kawashima,1 Miki Takahashi,1 Kayo Tomita,1 Kenji Kubota,2 Tetsuo Meshi,2 Satoshi Naito,1 and Masayuki Ishikawa1*

Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 ,1 Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan2

Received 23 July 2001/ Accepted 4 December 2001

The TOM1 gene of Arabidopsis thaliana encodes a putative multipass transmembrane protein which is necessary for the efficient multiplication of tobamoviruses. We have previously shown that mutations severely destructive to the TOM1 gene reduce tobamovirus multiplication to low levels but do not impair it completely. In this report, we subjected one of the tom1 mutants (tom1-1) to another round of mutagenesis and isolated a new mutant which did not permit a detectable level of tobamovirus multiplication. In addition to tom1-1, this mutant carried a mutation referred to as tom3-1. Positional cloning showed that TOM3 was one of two TOM1-like genes in Arabidopsis. Based on the similarity between the amino acid sequences of TOM1 and TOM3, together with the results of a Sos recruitment assay suggesting that both TOM1 and TOM3 bind tobamovirus-encoded replication proteins, we propose that TOM1 and TOM3 play parallel and essential roles in the replication of tobamoviruses.

* Corresponding author. Mailing address: Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan. Phone: 81-11-706-3888. Fax: 81-11-706-4932. E-mail: ishikawa{at}abs.agr.hokudai.ac.jp.

{dagger} Present address: Department of Biology, Tokyo Gakugei University, Koganei-shi, Tokyo 184-8501, Japan.

Journal of Virology, March 2002, p. 2491-2497, Vol. 76, No. 5
0022-538X/02/$04.00+0     DOI: 10.1128/jvi.76.5.2491-2497.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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