ATDAO2 is an IAA oxidase expressed in root caps. It is a member of a family of dioxygenase and 2OG Fe(II) oxygenase domain and DAO domain containing proteins. ATDAO1 is the primary constitutive mechanism of auxin catabolism in Arabidopsis and that the temporal- and tissue-specific oxidative inactivation of auxin by DAO adjusts indole-3-acetic acid levels throughout the life of the plant to optimize growth and development.
