This domain is found at the C-terminus of the FTO protein which was shown to be associated with increased BMI and obesity risk in humans. The N-terminal domain of this protein is a DNA demethylase and this domain is found to associate with the N-terminal domain in the crystal structure [1]. This domain is alpha helical with three helices that form a bundle [1].

1: Crystal structure of the FTO protein reveals basis for its substrate specificity. Han Z, Niu T, Chang J, Lei X, Zhao M, Wang Q, Cheng W, Wang J, Feng Y, Chai J; Nature. 2010; [Epub ahead of print] PMID:20376003