A molecular specificity code for the three mammalian KDEL receptors

  • Raykhel I
  • Alanen H
  • Salo K
 et al. 
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AC-terminal KDEL-like motif prevents secretion of soluble endoplasmic reticulum (ER)-resident proteins. This motif interacts with KDEL receptors localized in the intermediate compartment and Golgi apparatus. Such binding triggers retrieval back to the ER via a coat protein I-dependent pathway. To date, two human KDEL receptors have been reported. Here, we report the Golgi localization of a third human KDEL receptor. Using a reporter construct system from a screen of 152 variants, we identified 35 KDEL-like variants that result in efficient ER localization but do not match the current Prosite motif for ER localization ([KRHQSA]-[DENQ]-E-L). We cloned 16 human proteins with one of these motifs and all were found in the ER. A subsequent screen by bimolecular fluorescence complementation determined the specificities of the three human KDEL receptors. Each KDEL receptor has a unique pattern of motifs with which it interacts. This suggests a specificity in the retrieval of human proteins that contain different KDEL variants.

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  • Irina Raykhel

  • Heli Alanen

  • Kirsi Salo

  • Jaana Jurvansuu

  • Dat Nguyen Van

  • Maria Latva-Ranta

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