Prevents homeodomain proteins (e.g. STM) association to plasmodesmata and, consequently, cell-to-cell transport. Binds to RNA. Alters KN1 RNA-binding capacity (PubMed:17965274). Regulates cytoskeleton (e.g. actin) organization that determinates cell shape (By similarity). Interferes with cell-to-cell transport of tobacco mosaic virus movement protein (TMV-MP) by mediating its accumulation at microtubules, thus interfering with cell-to-cell virus movement. Interacts with KN-1 (PubMed:17965274). Binds to tobacco mosaic virus movement protein (TMV-MP) at microtubules (PubMed:12913144, PubMed:17965274). Microtubule-associated (PubMed:12913144). Localized in cytosolic punctae when associated with KN-1 (PubMed:17965274). Constitutively expressed in leaves. Belongs to the microtubule binding protein 2C family.