FRATIDE

Inhibitor of glycogen synthase kinase-3 (GSK-3); derived from FRAT1, the mammalian version of GSK-3-binding protein. Binds to GSK-3, inhibiting its interaction with axin, and also blocks GSK-3-catalyzed phosphorylation of axin and β-catenin. Does not affect GSK-3-mediated phosphorylation of glycogen synthase or eIF2B.

FRATtide is a peptide derived from the GSK-3 binding protein that inhibits the phosphorylation of Axin and β-catenin. FRATtide inhibits GSK-3 binding to Axin[1].

[1] Bax B, et al. The structure of phosphorylated GSK-3beta complexed with a peptide, FRATtide, that inhibits beta-catenin phosphorylation. Structure. 2001 Dec;9(12):1143-52. DOI:10.1016/s0969-2126(01)00679-7