PROSITE PDOC50088 SCOP 1awc SUPERFAMILY 1awc Available protein structures: Pfam structures PDB RCSB PDB ; PDBe PDBsum structure summary The ankyrin repeat is a 33-residue motif in proteins consisting of two alpha helices separated by loops , first discovered in signaling proteins in yeast Cdc10 and Drosophila Notch . Ankyrin repeats