Adaptins are important components of clathrin-coated vesicles transporting ligand-receptor complexes from the plasma membrane or from the trans Golgi network to lysosomes. Together with medium and small subunits, adaptins form a heterotetrameric complex called an adaptor whose role is to promote the formation of clathrin-coated pits and vesicles and to recognise sorting signals within the cytosolic tails of transmembrane cargo molecules. Gamma-adaptin protein belongs to the adaptor protein complex 1 that plays a role in protein sorting in the late-Golgi/trans-Golgi network and/or endosomes.