This domain is found at the C-terminal region of Heat resistant RNA dependent ATPase from Thermus thermophilus (also known as Hera) the first DEAD box helicase that forms a stable dimer in the absence of ligands. This dimerization domain (DD) folds into a single turn of a left-handed super-helix [1,2].

1: A novel dimerization motif in the C-terminal domain of the Thermus thermophilus DEAD box helicase Hera confers substantial flexibility. Klostermeier D, Rudolph MG; Nucleic Acids Res. 2009;37:421-430. PMID:19050012

2: The Thermus thermophilus DEAD box helicase Hera contains a modified RNA recognition motif domain loosely connected to the helicase core. Rudolph MG, Klostermeier D; RNA. 2009;15:1993-2001. PMID:19710183