The adaptor protein complexes mediate both the recruitment of clathrin to membranes and the recognition of sorting signals within the cytosolic tails of transmembrane cargo molecules. Adaptor protein complex 1 (AP-1) is a heterotetramer composed of two large adaptins (gamma-type subunit AP1G1 and beta-type subunit AP1B1), a medium adaptin (mu-type subunit AP1M1 or AP1M2) and a small adaptin (sigma-type subunit AP1S1 or AP1S2 or AP1S3). Subunits of clathrin-associated adaptor protein complex 1 play a role in protein sorting in the late-Golgi/trans-Golgi network (TGN) and/or in endosomes.<p>This group represents an adaptor protein complex, sigma subunit.</p>