Transcriptional activator activated by proteolytic cleavage through regulated intramembrane proteolysis (RIP). 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). A number of isoforms are produced. According to EST sequences. Expressed in roots, rosette leaves, cauline leaves, shoot apex, stems and flowers. By cold, heat and drought stresses. The NAC domain includes a DNA binding domain and a dimerization domain.