has part transmembrane signaling receptor activity MHC class I receptor activity Combining with an MHC class I protein complex to initiate a change in cellular activity. Class I here refers to classical class I molecules. gamma-delta T cell receptor activity Note that this term is intended for annotation of gene products that act as receptors for MHC class I protein complexes, not for components of the MHC class I protein complexes themselves. molecular_function alpha-beta T cell receptor activity GO:0032393 T cell receptor activity MHC class I protein binding immune receptor activity