1887

Abstract

Potyviruses are non-persistently transmitted by aphid vectors with the assistance of a viral accessory factor known as helper component (HC-Pro), a multifunctional protein that is also involved in many other essential processes during the virus infection cycle. A transient -mediated expression system was used to produce Plum pox virus (PPV) HC-Pro in leaves from constructs that incorporated the 5′ region of the genome, yielding high levels of HC-Pro in agroinfiltrated leaves. The expressed PPV HC-Pro was able to assist aphid transmission of purified virus particles in a sequential feeding assay, and to complement transmission-defective variants of the virus. Also, HC-Pro of a second potyvirus, (TEV), was expressed and found to be functional for aphid transmission. These results show that this transient system can be useful for production of functionally active HC-Pro in potyviruses, and the possible uses of this approach to study the mechanism of transmission are discussed.

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2006-11-01
2019-11-22
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