The components of ABA-mediated transcription in seeds. ABI5 is a member of the bZIP
transcription factors that bind to the ACGT-core containing the ABA responsive element (ABRE). ABI3 and ABI4 bind to the
RY/Sph element and coupling element 1 (CE1), respectively. RY/Sph and CE1 are cis elements that synergistically enhance
ABRE-mediated transcription. ABI3 and ABI5 interact with each other, but ABI4 and ABI5 do not.