Transcription activator activated by proteolytic cleavage through regulated intramembrane proteolysis (RIP). Involved in salt stress response during seed germination and seedling growth. Binds the auxin-responsive IAA30 gene promoter and may serve as a molecular link that interconnects a developmental feedback loop of auxin signaling with a salt signal transduction pathway during seed germination (PubMed:21450938).
Localized primarily in plasma membrane or endoplasmic reticulum membrane as dormant form and, upon specific stress or signal, is processed into a transcriptionally active and nuclear form after a proteolytic cleavage through regulated intramembrane proteolysis (RIP).