The Role of a C-Terminal Seven-Amino Acid Motif in TbCSV C3 Protein and Its Interaction With NbPOLA2 in Enhancing Viral Replication.

The C3 protein of tobacco curly shoot virus (TbCSV), a possible evolutionary intermediate between truly monopartite begomoviruses and those requiring satellite molecules for infectivity, has been identified as a viral replication enhancer (REn). However, the mechanisms underlying this enhancement are largely unknown. In this study, we generated two mutant infectious clones of TbCSV: one with a deletion of the 3' end region of the C3 gene that does not overlap with C2 (TbCSV) and another in which this region was replaced by a phylogenetically unrelated iLOV gene sequence (TbCSV).

Geminivirus C4 proteins inhibit GA signaling via prevention of NbGAI degradation, to promote viral infection and symptom development in N. benthamiana.

The phytohormone gibberellin (GA) is a vital plant signaling molecule that regulates plant growth and defense against abiotic and biotic stresses. To date, the molecular mechanism of the plant responses to viral infection mediated by GA is still undetermined. DELLA is a repressor of GA signaling and is recognized by the F-box protein, a component of the SCFSLY1/GID2 complex.