This is a Ribonuclease Inhibitor Protein that illustrates the horseshoe fold. β-α-β

It contains the LRR: Leucine Rich Repeat. The leucines, colored blue, are packed between the beta-strands (gold) and the alpha-helices (magenta).

A structural basis of the interactions between leucine-rich repeats and protein ligands.
Kobe, B., Deisenhofer, J
Nature 374 pp. 183 (1995)

(PubMed)

1dfj (PDB)