Abstract
Ubiquitin-conjugating enzymes (E2s/UBC) are components of the ubiquitin proteasome system (UPS), and the ubiquitin-conjugating enzyme variant (UEV) is one of E2s (ubiquitin-conjugating enzymes, UBC) subfamily. The UEVs and UBC13 play an auxiliary role in mediating Lys63-linked polyUb chain assembly, which is correlated with target protein non-proteolytic functions, such as DNA repair or response to stress. However, the collaborative mechanism of StUBC13 (homologue of AtUBC13) and StUEVs (the UEVs in potato) involved in potato are not fully understood understood. Here, we identified two StUBC13 and seven StUEVs from potato genome. We analyzed protein motif and conserved domain, gene structure, phylogenetic features, cis-acting elements of StUBC13 and StUEVs. Subsequently, we screened StUBC13 partners protein and verified interaction between StUBC13 and StUEVs using yeast two-hybrid, split luciferase complementation (SLC) and bimolecular fluorescence complementation (BiFC) approach. The expression profile and qRT-PCR analysis suggested that StUBC13 and StUEVs gene exhibited a tissue-specific expression and were induced by different stress. Overall, this investigative study provides a comprehensive reference and view for further functional research on StUBC13 and StUEV1s in potato.
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