Abstract
Protein degradation by ubiquitin / 26S proteasome system (UPS) is involved in various aspects of cellular activity. Selection of target protein in the UPS is catalized by ubiquitin ligase (E3).
In higher plants, metabolism of sugar (C) and nitrogen (N) is competitively regulated. To clarify the C/N regulator, we isolated novel C/N regulatory E3 ligase SSV1. The SSV1 gene belongs to ATL family. Although some ATLs have been reported to be involved in plant immunity, the detailed mechanisms are still unknown. To investigate the relationship between ATL family and pathogen resistance, we examined pathogen resistance using Pseudomonas syringae pv. tomato DC3000 . Plants overexpressing SSV1 and ATL6 which is most closely related gene to the SSV1 in ATL family showed increase in pathogen resistance, whereas double mutant.
Relationships between C/N balance regulation and plant immunity will be discussed in terms of ATL family.
