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THE PLANT CELL, Vol 4, Issue 7 751-757, Copyright © 1992 by American Society of Plant Biologists

RESEARCH ARTICLES

A Single Amino Acid Substitution in the Coat Protein of Cucumber Mosaic Virus Induces Chlorosis in Tobacco

M. H. Shintaku, L. Zhang and P. Palukaitis
Department of Plant Pathology, Cornell University, Ithaca, New York 14853

Some strains of cucumber mosaic virus (CMV) induce a bright yellow/white chlorosis in tobacco instead of the light green/dark green mosaic induced by most CMV strains. This property is controlled by RNA 3 of this tripartite virus. Recombination between cDNA clones of RNA 3 from a green mosaic strain, Fny-CMV, and a chlorotic strain, M-CMV, and inoculation of infectious transcripts of the chimeric RNAs 3, together with RNAs 1 and 2 of Fny-CMV, localized the chlorosis induction domain to a region of the coat protein gene containing two nucleotide differences. Site-directed mutagenesis of one nucleotide to change the codon for Leu129 in the M-CMV coat protein to Pro129 of Fny-CMV changed the phenotype from chlorotic to green mosaic, whereas the opposite change in phenotype was observed when the Pro129 in the Fny-CMV coat protein was altered to Ser129. Thus, the local secondary structure surrounding amino acid 129 rather than a particular amino acid per se is involved in chlorosis induction.


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