Transcriptional activator activated by proteolytic cleavage through regulated intramembrane proteolysis (RIP). Transcriptional activator that acts as positive regulator of AOX1A during mitochondrial dysfunction. Binds directly to AOX1A promoter. Mediates mitochondrial retrograde signaling. Localized primarily in endoplasmic reticulum membrane as dormant form and, upon abiotic stress, is processed into a transcriptionally active and nuclear form after a proteolytic cleavage through regulated intramembrane proteolysis (RIP). Expressed in roots, rosette leaves, cauline leaves, shoot apex, stems and flowers. By cold and drought stresses. The NAC domain includes a DNA binding domain and a dimerization domain.