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forkhead associated (FHA) domain found in pleckstrin homology-like domain family B member 1 (PHLDB1) and similar proteins PHLDB1, also called protein LL5-alpha (LL5A), acts as an insulin-responsive protein that enhances Akt activation. PHLDB1 contains a pleckstrin homology domain, which binds phosphatidylinositol PI(3,4)P(2), PI(3,5)P(2), and PI(3,4,5)P(3), as well as a Forkhead-associated (FHA) domain and coiled coil regions. The FHA domain is a small phosphopeptide recognition module, but this group may lack the conserved residues that are required for binding phosphothreonine.
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