A small anaerobically induced tomato transcription factor was isolated from a subtractive library. This factor, desig-nated ABZ1 (anaerobic basic leucine zipper), is anaerobi-cally induced in fruits, leaves and roots and encodes a nuclear localized protein. ABZ1 shares close structural and sequence homology with the S-family of small basic leucine zipper (bZIP) transcription factors that are implicated in stress localizationofABZ1 ismediatedby the basic region and occurs under normoxic conditions. ABZ1 binds to G-box-like target sites as a dimer. .
