Claim: ATF4 is a widely expressed mammalian DNA binding protein that has been shown to interact with GABBR1.
Evidence: This gene encodes a transcription factor that was originally identified as a widely expressed mammalian DNA binding protein that could bind a tax-responsive enhancer element in the LTR of HTLV-1. GABBR1 has been shown to interact with ATF4 and GABBR2.