FUNCTION Segmentation polarity protein. Acts as a receptor for the hedgehog protein (hh). Associates with the smoothened protein (SMO) to transduce the hedgehog signal leading to the activation of wingless, decapentaplegic and patched itself. Participates in cell interactions that establish pattern within the segment and the imaginal disks during development. In the absence of HH, represses the constitutive signaling activity of smo through fused (FU).SUBUNIT Interacts (via C-terminal cytoplasmic region) with CG5504/l(2)tid; the interaction is probably direct (PubMed:12783860). Interacts with hh/hedgehog (PubMed:12783860).SUBCELLULAR LOCATION Embryonic lethal with epidermal pattern formation defects.SIMILARITY Belongs to the patched family.