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Potyvirus CI RNA helicase is a protein involved in RNA genome replication and virus movement. The protein aggregates in the cytoplasm of infected cells to form typical cylindrical inclusions. A yeast two-hybrid system was used to analyse interactions of the CI RNA helicase from plum pox potyvirus (PPV) with itself and with other viral proteins. No interactions could be detected of full-length CI protein with itself or with PPV P3/6K1, NIa, NIb or CP proteins. However, positive self-interactions were detected for N-terminal fragments of the CI protein, allowing the mapping of a CI-CI binding domain to the N-terminal 177 aa of the protein. Further deletion analysis suggested that several regions of this domain contribute to the interaction. Moreover, pull-down experiments demonstrate that, at least in vitro, full-length PPV CI protein is able to self-interact in the absence of other virus or plant factors.

Identification of an N-terminal domain of the plum pox potyvirus CI RNA helicase involved in self-interaction in a yeast two-hybrid system