CHD proteins (name derived from the presence of a Chromodomain, SWI2/SNF2 ATPase/Helicase and a motif with sequence similarity to a DNA)binding domain) are ATP-dependent chromatin remodelers found in plant and animals. In eukaryotes, there are three subfamilies, I, II and III. This domain is found in members of subfamily II which play a role in repression of genes involved in developmental regulation, including Mi-2 from Drosophila melanogaster, CHD3/4/5 from animals and PICKLE (a CHD3/4-related protein) from Arabidopsis. Sequence analysis revealed that this domain has a considerable similarity to SANT domains suggesting that it fold into this type of domain and it is integral to the DNA binding domain of CHD remodelers in subfamily II [1].

1: PICKLE is a CHD subfamily II ATP-dependent chromatin remodeling factor. Ho KK, Zhang H, Golden BL, Ogas J; Biochim Biophys Acta. 2013;1829:199-210. PMID:23128324