Transcription factor capable of interacting with purine rich repeats (GA repeats) (PubMed:8441384, PubMed:10675337, PubMed:8816484). Acts as a a master regulator of nuclear-encoded mitochondrial genes (By similarity).
The C1 factor interacts with the GABP_ transactivation domain.The domain of the C1 factor required for C1GABP interaction can inhibit GABP_dependent transcriptional activation