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The sequence Lys-Asp-Glu-Leu (KDEL) or a closely related sequence, is present at the carboxy-terminus of soluble endoplasmic reticulum (ER) resident proteins and some membrane proteins. 78 and 94 kDa glucose regulated proteins, GRP78 and GRP94 respectively, and protein disulfide isomerase (PDI) all share the C-terminal KDEL sequence. The presence of carboxy-terminal KDEL appears to be necessary for ER retention and appears to be sufficient to reduce the secretion of proteins from the ER. This retention is reported to be mediated by a KDEL receptor.
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Protein Aliases: 78 kDa glucose-regulated protein; 94 kDa glucose-regulated protein; Binding-immunoglobulin protein; BiP; Endoplasmic reticulum chaperone BiP; endoplasmic reticulum lumenal Ca(2+)-binding protein grp78; Endoplasmin; endothelial cell (HBMEC) glycoprotein; epididymis luminal protein 35; epididymis secretory sperm binding protein Li 125m; epididymis secretory sperm binding protein Li 89n; ER lumen protein retaining receptor 1; ER lumen protein-retaining receptor 1; glucose-regulated protein, 78kDa; gp96 homolog; GRP-78; GRP-94; heat shock 70kDa protein 5 (glucose-regulated protein, 78kDa); Heat shock protein 70 family protein 5; Heat shock protein 90 kDa beta member 1; heat shock protein 90kDa beta (Grp94), member 1; heat shock protein 90kDa beta family member 1; Heat shock protein family A member 5; Heat shock protein family C member 4; HSP70 family protein 5; Immunoglobulin heavy chain-binding protein; KDEL; KDEL (Lys-Asp-Glu-Leu) endoplasmic reticulum protein retention receptor 1; KDEL endoplasmic reticulum protein retention receptor 1; KDEL receptor 1; Lys-Asp-Glu-Leu; Putative MAPK-activating protein PM23; RP23-446N16.1; stress-inducible tumor rejection antigen gp96; tumor rejection antigen (gp96) 1; Tumor rejection antigen 1
Gene Aliases: BIP; ECGP; ERD2; ERD2.1; GP96; GRP78; GRP94; HDEL; HEL-S-125m; HEL-S-89n; HEL35; HSP90B1; HSPA5; HSPC4; KDELR1; MIF2; PM23; TRA1
UniProt ID: (Human) P14625, (Human) P11021, (Human) P24390
Entrez Gene ID: (Human) 7184, (Human) 3309, (Human) 10945
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