Abstract
In order to explore the mechanism of geminivirus DNA replication, we show that the Replication initiator (Rep) protein encoded by Mungbean yellow mosaic India virus (MYMIV), a member of the family Geminiviridae, binds specifically to the iterons present in the viral DNA replication origin (CR-A) in a highly ordered manner that might be a prerequisite for the initiation of replication. MYMIV Rep also acts as a helicase during the post-initiation stage and is upregulated in presence of the RPA32 subunit of Replication Protein A. The implication of these findings on the initiation and elongation stages of MYMIV DNA replication has been discussed.
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