This entry represents the C-terminal region of protein Inscuteable (Insc) containing four putative armadillo repeats and the conserved extreme C-terminal tetrapeptide Glu-Ser-Phe-Val which is in agreement with the class I PDZ-binding motif X-Ser/Thr-X-/ (X and /are unspecified and hydrophobic residues, respectively). Insc functions as an adaptor protein that binds simultaneously with Partner of Insc (Pins, consisting of alpha subunit (Ga) of heterotrimeric G proteins and its guanine nucleotide dissociation inhibitor) and Par3 (PDZ-containing proteins) to regulate their apical localisation in neuroblasts, which is required for the correct execution of the asymmetric division [1,2].

1: Two forms of human Inscuteable-related protein that links Par3 to the Pins homologues LGN and AGS3. Izaki T, Kamakura S, Kohjima M, Sumimoto H; Biochem Biophys Res Commun. 2006;341:1001-1006. PMID:16458856

2: LGN/mInsc and LGN/NuMA complex structures suggest distinct functions in asymmetric cell division for the Par3/mInsc/LGN and Galphai/LGN/NuMA pathways. Zhu J, Wen W, Zheng Z, Shang Y, Wei Z, Xiao Z, Pan Z, Du Q, Wang W, Zhang M; Mol Cell. 2011;43:418-431. PMID:21816348