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Journal of Virology, August 2003, p. 8669-8675, Vol. 77, No. 16
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.16.8669-8675.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Identification of a Region of the Tobacco Mosaic Virus 126- and 183-Kilodalton Replication Proteins Which Binds Specifically to the Viral 3'-Terminal tRNA-Like Structure

Department of Biological Sciences, Imperial College London, London SW7 2AZ, United Kingdom

Received 10 March 2003/ Accepted 23 May 2003

UV irradiation of a mixture of an isolated tobacco mosaic virus (TMV; tomato strain L [TMV-L]) RNA-dependent RNA polymerase complex and the TMV-L RNA 3'-terminal region (3'-TR) resulted in cross-linking of the TMV-L 126-kDa replication protein to the TMV-L 3'-TR. Using both Escherichia coli-expressed proteins corresponding to parts of the 126-kDa protein and mutants of the 3'-TR, the interacting sites were located to a 110-amino-acid region just downstream of the core methyltransferase domain in the protein and a region comprising the central core C and domain D2 in the 3'-TR. Mutation to alanine of a tyrosine residue at position 409 or a tyrosine residue at position 416 in the protein binding region abolished cross-linking to the 3'-TR, and corresponding mutations introduced into TMV-L RNA abolished its ability to replicate in tomato protoplasts, with no detectable production of either plus- or minus-strand RNA. The results are compatible with a model for initiation of TMV-L minus-strand RNA synthesis in which an internal region of the TMV-L 126-kDa protein first binds to the central core C and domain D2 region of the TMV-L 3'-TR and is then followed by binding of the 183-kDa protein to this complex and positioning of the catalytically active site of the polymerase domain close to the 3'-terminal CCCA initiation site.

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