The function of KDELR1 (KDEL endoplasmic reticulum protein retention receptor 1, ENSG00000105438) is as follows. Receptor for the C-terminal sequence motif K-D-E-L that is present on endoplasmic reticulum resident proteins and that mediates their recycling from the Golgi back to the endoplasmic reticulum. {ECO:0000269|PubMed:11703931, ECO:0000269|PubMed:14517323, ECO:0000269|PubMed:18086916, ECO:0000269|PubMed:30846601, ECO:0000269|PubMed:8392934}.