| Function |
Acts a component of the CCAT-binding factor, which is a transcriptional activator and binds to the upstream activation site (UAS2) of the CYC1 gene and other genes involved in mitochondrial electron transport and activates their expression. Recognizes the sequence 5'-CCAAT-3'. HAP4 encodes a regulatory subunit of the DNA-bound complex and seems to provide the principal transcriptional activation domains. Does not bind DNA directly, but augments the binding of HAP2 and HAP3. {ECO:0000269|PubMed:15075264, ECO:0000269|PubMed:2676721}.
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