This domain is found in the multiprotein bridging factor 1 (MBF1) which forms a heterodimer with MBF2. It has been shown to make direct contact with the TATA-box binding protein (TBP) and interacts with Ftz-F1, stabilising the Ftz-F1-DNA complex [2]. It is also found in the endothelial differentiation-related factor (EDF-1). Human EDF-1 is involved in the repression of endothelial differentiation, interacts with CaM and is phosphorylated by PKC [1]. The domain is found in a wide range of eukaryotic proteins including metazoans, fungi and plants. A helix-turn-helix motif (Pfam:PF01381) is found to its C-terminus.

1: Cloning and characterization of murine EDF-1. De Benedictis L, Mariotti M, Dragoni I, Maier JA; Gene 2001;275:299-304. PMID:11587857

2: Multiprotein bridging factor 1 (MBF1) is an evolutionarily conserved transcriptional coactivator that connects a regulatory factor and TATA element-binding protein. Takemaru K, Li FQ, Ueda H, Hirose S; Proc Natl Acad Sci U S A 1997;94:7251-7256. PMID:9207077