The function of GPRASP1 (G protein-coupled receptor associated sorting protein 1, Ensembl gene identifier ENSG00000198932) is as follows. Modulates lysosomal sorting and functional down-regulation of a variety of G protein-coupled receptors. Targets receptors for degradation in lysosomes via its interaction with BECN2. {ECO:0000269|PubMed:12142540, ECO:0000269|PubMed:15452121, ECO:0000269|PubMed:23954414}.