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Plant viruses move to adjacent cells with the use of virus-encoded cell-to-cell movement proteins. Using proteins produced by in vitro translation, we present evidence that the '69K' movement protein of Turnip yellow mosaic virus (TYMV) is recognized as a substrate for the attachment of polyubiquitin chains and for subsequent rapid and selective proteolysis by the proteasome, the ATP-dependent proteolytic system present in reticulocyte lysate. Truncation of the 69K protein suggests the existence of two degradation signals within its sequence. We propose that selective degradation of virus movement proteins may contribute to the previously reported transient nature of their accumulation during infection.

Stability in vitro of the 69K movement protein of Turnip yellow mosaic virus is regulated by the ubiquitin-mediated proteasome pathway