G Protein-Coupled Receptor (GPCR) Paper Model
On the extracellular side, the helices form a cavity where ligands (e.g. endorphins, morphine, serotonin) bind. On the intracellular side, the receptor is coupled to G protein. When the receptor is activated by a ligand, the G protein splits in two parts which then activate other proteins in the internal signal transduction pathways.
To build the paper model featuring the shared structural features of all GPCRs download and print the template PDF.