CRBN interacts with a
similar feature on the substrate proteins
GSPT1, CK1α, and Ikaros. CRBN (green) bound to GSPT1 (a, blue,
PDB ID: 5HXB), CK1α (b, blue, PDB ID: 5FQD), or Ikaros (c, blue, PDB ID: 6H0F) interacts with
a hairpin on the substrate protein. Ligands are represented as sticks
(maroon) with CC-885 present in panel a, lenalidomide present in panel
b, and pomalidomide present in panel c. The same pattern of three
direct hydrogen bonds from residues N351, H357 and W400 is present
between CRBN and GSPT1, CK1α, or Ikaros.