-  Superclass
-  Other all-alpha-helical DNA-binding domains
-  "Class description: This superclass comprises transcription factors with DNA-binding domains that exhibit alpha-helically structured interfaces interacting with the DNA. So far, only the HMG proteins are structurally well characterized, whereas the DNA-binding mode of NF-Y proteins is mainly based on modeling by homology. The proteins of this group show significant similarities to some non-specific DNA-binding proteins."