1887

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Volume 81, Issue 3

Mutations in the coat protein gene of suppress particle assembly, heterologous encapsidation and complementation in transgenic plants of Free

Abstract

Two different motifs in the coat protein (CP) of (PPV) (RQ, D) were mutated by replacing the respective amino acids with others possessing different chemical properties. The mutated CP genes were introduced into an infectious full-length clone of PPV (p35PPV-NAT) to investigate their influence on systemic infection of transgenic wild-type PPV CP-expressing and non-transgenic plants of . All mutants failed to establish systemic infections in non-transgenic plants, but were complemented by intact CP in transgenic plants. Moreover, the CP-RQ-D mutant (carrying mutations in both the RQ and D motifs) was introduced into p35PPV-NAT engineered to express β-glucuronidase (GUS) for direct observation of systemic movement and particle assembly in leaves. GUS-staining revealed that the CP mutant (RQ-D) was restricted to initially infected cells without forming virions. Systemic movement and particle assembly were restored in CP-transgenic plants. Finally, transgenic plants were generated that expressed each of the three mutated CP genes. Homozygous T lines were selected and tested for resistance to PPV. Immunogold labelling and electron microscopy revealed that heterologous encapsidation with challenging and was suppressed in these lines. In addition, assembly mutants did not complement CP-defective p35PPV-NAT. The possible use of modified viral CP genes for the production of virus-resistant transgenic plants, thereby reducing the putative risks of heterologous encapsidation and complementation, is discussed.

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2000-03-01
2023-09-28
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Mutations in the coat protein gene of Plum pox virus suppress particle assembly, heterologous encapsidation and complementation in transgenic plants of Nicotiana benthamiana
J. Gen. Virol. 81, 567 (2000); https://doi.org/10.1099/0022-1317-81-3-567
/content/journal/jgv/10.1099/0022-1317-81-3-567
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