The protein has no function in the formation of pyridoxal 5'-phosphate. Homodimer or heterodimer with PDX1.1 or PDX1.3. No interaction with PDX2. Expressed in callus tissues, flowers and roots. Weakly expressed in leaves and stems. Unlike PDX1.1 or PDX1.3, PDX1.2 is unable to interact with PDX2 and restore prototrophy in yeast snz1 mutants. Belongs to the PdxS/SNZ family.