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    Virology. 1990 Oct;178(2):573-8.

    Comparative sequence of the helper component (HC) region of potato virus Y and a HC-defective strain, potato virus C.

    Thornbury DW, Patterson CA, Dessens JT, Pirone TP.

    Department of Plant Pathology, University of Kentucky, Lexington 40546.

    Potato virus C (PVC), a non-aphid transmissible strain of potato virus Y (PVY), was found to code for a protein (PVC-HC) which is similar in molecular weight and immunological reactivity to the helper component protein of PVY (PVY-HC). PVC-HC, however, was inactive with respect to its ability to effect aphid transmission of either PVC or PVY. The 5'-terminal 2.7-kb regions of PVC and PVY were sequenced. Within the HC region there was 92% nucleotide homology between the two strains; comparison of the derived amino acid sequences revealed 24 amino acid differences. Comparison of the PVC-HC sequence with that of five potyviruses revealed 2 amino acid changes which were specific to PVC-HC. These amino acids are prime targets for mutational analysis of HC activity.

    PMID: 2219708 [PubMed - indexed for MEDLINE]

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