This domain is found at the C-terminus of chromodomain-helicase-DNA-binding proteins, including Chromodomain-helicase-DNA-binding protein 1 from humans (CHD1), an ATP-dependent chromatin-remodeling factor which acts as substrate recognition component of the transcription regulatory histone acetylation (HAT) complex SAGA. This helical domain consists of five alpha-helices organised in a variant helical bundle topology. Its surface is positively charged and can bind dsDNA and nucleosomes, but its specific function remains unknown [1,2,3].

1: Recognition of trimethylated histone H3 lysine 4 facilitates the recruitment of transcription postinitiation factors and pre-mRNA splicing. Sims RJ 3rd, Millhouse S, Chen CF, Lewis BA, Erdjument-Bromage H, Tempst P, Manley JL, Reinberg D; Mol Cell. 2007;28:665-676. PMID:18042460

2: Missense variants in the chromatin remodeler CHD1 are associated with neurodevelopmental disability. Pilarowski GO, Vernon HJ, Applegate CD, Boukas L, Cho MT, Gurnett CA, Benke PJ, Beaver E, Heeley JM, Medne L, Krantz ID, Azage M, Niyazov D, Henderson LB, Wentzensen IM, Baskin B, Sacoto MJG, Bowman GD, Bjornsson HT; J Med Genet. 2018;55:561-566. PMID:28866611

3: The Chromatin Remodelling Protein CHD1 Contains a Previously Unrecognised C-Terminal Helical Domain. Mohanty B, Helder S, Silva AP, Mackay JP, Ryan DP; J Mol Biol. 2016;428:4298-4314. PMID:27591891