Transcriptional activator that mediates auxin signaling to promote lateral root development. Activates the expression of two downstream auxin-responsive genes, DBP and AIR3. Dimer. Interacts with SINAT5. Predominantly expressed in the root tip and in lateral root initiation sites. Also detected in expanding cotyledon, and in leaf primordia. Induced by auxin. The NAC domain includes a DNA-binding domain and a dimerization domain. Ubiquitinated (Probable). The interaction with SINAT5 mediate its proteasome-dependent degradation (PubMed:12226665).