CpG-binding protein is a transcriptional activator that exhibits a DNA binding specificity for unmethylated CpG motifs [1]. CpG is made of a PHD1, an acidic, a basic, a coiled-coil, and a PHD2 domains [1,2]. This protein contains three cysteine-rich domains identified at the N-terminal, central region and C-terminal of the protein, where the central cysteine-rich domain is located within the DNA-binding domain, found between PHD1 and the acidic domains. This domain is found in eukaryotes, and is approximately 240 amino acids in length. It is found at the C-terminal of the CpG-binding protein containing the coiled-coil and PHD2 domains.

1: Identification and characterization of the DNA binding domain of CpG-binding protein. Lee JH, Voo KS, Skalnik DG; J Biol Chem. 2001;276:44669-44676. PMID:11572867

2: Cloning of a mammalian transcriptional activator that binds unmethylated CpG motifs and shares a CXXC domain with DNA methyltransferase, human trithorax, and methyl-CpG binding domain protein 1. Voo KS, Carlone DL, Jacobsen BM, Flodin A, Skalnik DG; Mol Cell Biol. 2000;20:2108-2121. PMID:10688657