This is the LGN-binding domain (LBD) of the inscuteable homologue protein. It interacts with the TPR motifs of G-protein-signaling modulator 2 (GPSM2) (LGN) and stabilises LGN [1].

1: Structural basis for interaction between the conserved cell polarity proteins Inscuteable and Leu-Gly-Asn repeat-enriched protein (LGN). Yuzawa S, Kamakura S, Iwakiri Y, Hayase J, Sumimoto H; Proc Natl Acad Sci U S A. 2011;108:19210-19215. PMID:22074847